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* [PATCH v2 0/2] move __HAVE_ARCH_PTE_SPECIAL in Kconfig
@ 2018-04-10 15:25 ` Laurent Dufour
  0 siblings, 0 replies; 55+ messages in thread
From: Laurent Dufour @ 2018-04-10 15:25 UTC (permalink / raw)
  To: linux-arm-kernel

The per architecture __HAVE_ARCH_PTE_SPECIAL is defined statically in the
per architecture header files. This doesn't allow to make other
configuration dependent on it.

The first patch of this series is replacing __HAVE_ARCH_PTE_SPECIAL by
CONFIG_ARCH_HAS_PTE_SPECIAL defined into the Kconfig files,
setting it automatically when architectures was already setting it in
header file.

The second patch is removing the odd define HAVE_PTE_SPECIAL which is a
duplicate of CONFIG_ARCH_HAS_PTE_SPECIAL.

There is no functional change introduced by this series.

Laurent Dufour (2):
  mm: introduce ARCH_HAS_PTE_SPECIAL
  mm: remove odd HAVE_PTE_SPECIAL

 .../features/vm/pte_special/arch-support.txt       |  2 +-
 arch/arc/Kconfig                                   |  1 +
 arch/arc/include/asm/pgtable.h                     |  2 --
 arch/arm/Kconfig                                   |  1 +
 arch/arm/include/asm/pgtable-3level.h              |  1 -
 arch/arm64/Kconfig                                 |  1 +
 arch/arm64/include/asm/pgtable.h                   |  2 --
 arch/powerpc/Kconfig                               |  1 +
 arch/powerpc/include/asm/book3s/64/pgtable.h       |  3 ---
 arch/powerpc/include/asm/pte-common.h              |  3 ---
 arch/riscv/Kconfig                                 |  1 +
 arch/s390/Kconfig                                  |  1 +
 arch/s390/include/asm/pgtable.h                    |  1 -
 arch/sh/Kconfig                                    |  1 +
 arch/sh/include/asm/pgtable.h                      |  2 --
 arch/sparc/Kconfig                                 |  1 +
 arch/sparc/include/asm/pgtable_64.h                |  3 ---
 arch/x86/Kconfig                                   |  1 +
 arch/x86/include/asm/pgtable_types.h               |  1 -
 include/linux/pfn_t.h                              |  4 ++--
 mm/Kconfig                                         |  3 +++
 mm/gup.c                                           |  4 ++--
 mm/memory.c                                        | 23 ++++++++++------------
 23 files changed, 27 insertions(+), 36 deletions(-)

-- 
2.7.4


^ permalink raw reply	[flat|nested] 55+ messages in thread
* [PATCH v2 0/2] move __HAVE_ARCH_PTE_SPECIAL in Kconfig
@ 2018-04-10 15:25 ` Laurent Dufour
  0 siblings, 0 replies; 55+ messages in thread
From: Laurent Dufour @ 2018-04-10 15:25 UTC (permalink / raw)
  To: linux-kernel, linux-mm, linuxppc-dev, x86, linux-doc,
	linux-snps-arc, linux-arm-kernel, linux-riscv, linux-s390,
	linux-sh, sparclinux, Jerome Glisse, mhocko, aneesh.kumar, akpm,
	mpe, benh, paulus, Jonathan Corbet, Catalin Marinas, Will Deacon,
	Yoshinori Sato, Rich Felker, David S . Miller, Thomas Gleixner,
	Ingo Molnar, Vineet Gupta, Palmer Dabbelt, Albert Ou,
	Martin Schwidefsky, Heiko Carstens, David Rientjes

The per architecture __HAVE_ARCH_PTE_SPECIAL is defined statically in the
per architecture header files. This doesn't allow to make other
configuration dependent on it.

The first patch of this series is replacing __HAVE_ARCH_PTE_SPECIAL by
CONFIG_ARCH_HAS_PTE_SPECIAL defined into the Kconfig files,
setting it automatically when architectures was already setting it in
header file.

The second patch is removing the odd define HAVE_PTE_SPECIAL which is a
duplicate of CONFIG_ARCH_HAS_PTE_SPECIAL.

There is no functional change introduced by this series.

Laurent Dufour (2):
  mm: introduce ARCH_HAS_PTE_SPECIAL
  mm: remove odd HAVE_PTE_SPECIAL

 .../features/vm/pte_special/arch-support.txt       |  2 +-
 arch/arc/Kconfig                                   |  1 +
 arch/arc/include/asm/pgtable.h                     |  2 --
 arch/arm/Kconfig                                   |  1 +
 arch/arm/include/asm/pgtable-3level.h              |  1 -
 arch/arm64/Kconfig                                 |  1 +
 arch/arm64/include/asm/pgtable.h                   |  2 --
 arch/powerpc/Kconfig                               |  1 +
 arch/powerpc/include/asm/book3s/64/pgtable.h       |  3 ---
 arch/powerpc/include/asm/pte-common.h              |  3 ---
 arch/riscv/Kconfig                                 |  1 +
 arch/s390/Kconfig                                  |  1 +
 arch/s390/include/asm/pgtable.h                    |  1 -
 arch/sh/Kconfig                                    |  1 +
 arch/sh/include/asm/pgtable.h                      |  2 --
 arch/sparc/Kconfig                                 |  1 +
 arch/sparc/include/asm/pgtable_64.h                |  3 ---
 arch/x86/Kconfig                                   |  1 +
 arch/x86/include/asm/pgtable_types.h               |  1 -
 include/linux/pfn_t.h                              |  4 ++--
 mm/Kconfig                                         |  3 +++
 mm/gup.c                                           |  4 ++--
 mm/memory.c                                        | 23 ++++++++++------------
 23 files changed, 27 insertions(+), 36 deletions(-)

-- 
2.7.4

^ permalink raw reply	[flat|nested] 55+ messages in thread
* [PATCH v2 0/2] move __HAVE_ARCH_PTE_SPECIAL in Kconfig
@ 2018-04-10 15:25 ` Laurent Dufour
  0 siblings, 0 replies; 55+ messages in thread
From: Laurent Dufour @ 2018-04-10 15:25 UTC (permalink / raw)
  To: linux-kernel, linux-mm, linuxppc-dev, x86, linux-doc,
	linux-snps-arc, linux-arm-kernel, linux-riscv, linux-s390,
	linux-sh, sparclinux, Jerome Glisse, mhocko, aneesh.kumar, akpm,
	mpe, benh, paulus, Jonathan Corbet, Catalin Marinas, Will Deacon,
	Yoshinori Sato, Rich Felker, David S . Miller, Thomas Gleixner,
	Ingo Molnar, Vineet Gupta, Palmer Dabbelt, Albert Ou,
	Martin Schwidefsky, Heiko Carstens, David Rientjes

The per architecture __HAVE_ARCH_PTE_SPECIAL is defined statically in the
per architecture header files. This doesn't allow to make other
configuration dependent on it.

The first patch of this series is replacing __HAVE_ARCH_PTE_SPECIAL by
CONFIG_ARCH_HAS_PTE_SPECIAL defined into the Kconfig files,
setting it automatically when architectures was already setting it in
header file.

The second patch is removing the odd define HAVE_PTE_SPECIAL which is a
duplicate of CONFIG_ARCH_HAS_PTE_SPECIAL.

There is no functional change introduced by this series.

Laurent Dufour (2):
  mm: introduce ARCH_HAS_PTE_SPECIAL
  mm: remove odd HAVE_PTE_SPECIAL

 .../features/vm/pte_special/arch-support.txt       |  2 +-
 arch/arc/Kconfig                                   |  1 +
 arch/arc/include/asm/pgtable.h                     |  2 --
 arch/arm/Kconfig                                   |  1 +
 arch/arm/include/asm/pgtable-3level.h              |  1 -
 arch/arm64/Kconfig                                 |  1 +
 arch/arm64/include/asm/pgtable.h                   |  2 --
 arch/powerpc/Kconfig                               |  1 +
 arch/powerpc/include/asm/book3s/64/pgtable.h       |  3 ---
 arch/powerpc/include/asm/pte-common.h              |  3 ---
 arch/riscv/Kconfig                                 |  1 +
 arch/s390/Kconfig                                  |  1 +
 arch/s390/include/asm/pgtable.h                    |  1 -
 arch/sh/Kconfig                                    |  1 +
 arch/sh/include/asm/pgtable.h                      |  2 --
 arch/sparc/Kconfig                                 |  1 +
 arch/sparc/include/asm/pgtable_64.h                |  3 ---
 arch/x86/Kconfig                                   |  1 +
 arch/x86/include/asm/pgtable_types.h               |  1 -
 include/linux/pfn_t.h                              |  4 ++--
 mm/Kconfig                                         |  3 +++
 mm/gup.c                                           |  4 ++--
 mm/memory.c                                        | 23 ++++++++++------------
 23 files changed, 27 insertions(+), 36 deletions(-)

-- 
2.7.4

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^ permalink raw reply	[flat|nested] 55+ messages in thread
* [PATCH v2 0/2] move __HAVE_ARCH_PTE_SPECIAL in Kconfig
@ 2018-04-10 15:25 ` Laurent Dufour
  0 siblings, 0 replies; 55+ messages in thread
From: Laurent Dufour @ 2018-04-10 15:25 UTC (permalink / raw)
  To: linux-riscv

The per architecture __HAVE_ARCH_PTE_SPECIAL is defined statically in the
per architecture header files. This doesn't allow to make other
configuration dependent on it.

The first patch of this series is replacing __HAVE_ARCH_PTE_SPECIAL by
CONFIG_ARCH_HAS_PTE_SPECIAL defined into the Kconfig files,
setting it automatically when architectures was already setting it in
header file.

The second patch is removing the odd define HAVE_PTE_SPECIAL which is a
duplicate of CONFIG_ARCH_HAS_PTE_SPECIAL.

There is no functional change introduced by this series.

Laurent Dufour (2):
  mm: introduce ARCH_HAS_PTE_SPECIAL
  mm: remove odd HAVE_PTE_SPECIAL

 .../features/vm/pte_special/arch-support.txt       |  2 +-
 arch/arc/Kconfig                                   |  1 +
 arch/arc/include/asm/pgtable.h                     |  2 --
 arch/arm/Kconfig                                   |  1 +
 arch/arm/include/asm/pgtable-3level.h              |  1 -
 arch/arm64/Kconfig                                 |  1 +
 arch/arm64/include/asm/pgtable.h                   |  2 --
 arch/powerpc/Kconfig                               |  1 +
 arch/powerpc/include/asm/book3s/64/pgtable.h       |  3 ---
 arch/powerpc/include/asm/pte-common.h              |  3 ---
 arch/riscv/Kconfig                                 |  1 +
 arch/s390/Kconfig                                  |  1 +
 arch/s390/include/asm/pgtable.h                    |  1 -
 arch/sh/Kconfig                                    |  1 +
 arch/sh/include/asm/pgtable.h                      |  2 --
 arch/sparc/Kconfig                                 |  1 +
 arch/sparc/include/asm/pgtable_64.h                |  3 ---
 arch/x86/Kconfig                                   |  1 +
 arch/x86/include/asm/pgtable_types.h               |  1 -
 include/linux/pfn_t.h                              |  4 ++--
 mm/Kconfig                                         |  3 +++
 mm/gup.c                                           |  4 ++--
 mm/memory.c                                        | 23 ++++++++++------------
 23 files changed, 27 insertions(+), 36 deletions(-)

-- 
2.7.4

^ permalink raw reply	[flat|nested] 55+ messages in thread
* [PATCH v2 0/2] move __HAVE_ARCH_PTE_SPECIAL in Kconfig
@ 2018-04-10 15:25 ` Laurent Dufour
  0 siblings, 0 replies; 55+ messages in thread
From: Laurent Dufour @ 2018-04-10 15:25 UTC (permalink / raw)
  To: linux-snps-arc

The per architecture __HAVE_ARCH_PTE_SPECIAL is defined statically in the
per architecture header files. This doesn't allow to make other
configuration dependent on it.

The first patch of this series is replacing __HAVE_ARCH_PTE_SPECIAL by
CONFIG_ARCH_HAS_PTE_SPECIAL defined into the Kconfig files,
setting it automatically when architectures was already setting it in
header file.

The second patch is removing the odd define HAVE_PTE_SPECIAL which is a
duplicate of CONFIG_ARCH_HAS_PTE_SPECIAL.

There is no functional change introduced by this series.

Laurent Dufour (2):
  mm: introduce ARCH_HAS_PTE_SPECIAL
  mm: remove odd HAVE_PTE_SPECIAL

 .../features/vm/pte_special/arch-support.txt       |  2 +-
 arch/arc/Kconfig                                   |  1 +
 arch/arc/include/asm/pgtable.h                     |  2 --
 arch/arm/Kconfig                                   |  1 +
 arch/arm/include/asm/pgtable-3level.h              |  1 -
 arch/arm64/Kconfig                                 |  1 +
 arch/arm64/include/asm/pgtable.h                   |  2 --
 arch/powerpc/Kconfig                               |  1 +
 arch/powerpc/include/asm/book3s/64/pgtable.h       |  3 ---
 arch/powerpc/include/asm/pte-common.h              |  3 ---
 arch/riscv/Kconfig                                 |  1 +
 arch/s390/Kconfig                                  |  1 +
 arch/s390/include/asm/pgtable.h                    |  1 -
 arch/sh/Kconfig                                    |  1 +
 arch/sh/include/asm/pgtable.h                      |  2 --
 arch/sparc/Kconfig                                 |  1 +
 arch/sparc/include/asm/pgtable_64.h                |  3 ---
 arch/x86/Kconfig                                   |  1 +
 arch/x86/include/asm/pgtable_types.h               |  1 -
 include/linux/pfn_t.h                              |  4 ++--
 mm/Kconfig                                         |  3 +++
 mm/gup.c                                           |  4 ++--
 mm/memory.c                                        | 23 ++++++++++------------
 23 files changed, 27 insertions(+), 36 deletions(-)

-- 
2.7.4

^ permalink raw reply	[flat|nested] 55+ messages in thread
* [PATCH v2 0/2] move __HAVE_ARCH_PTE_SPECIAL in Kconfig
@ 2018-04-10 15:25 ` Laurent Dufour
  0 siblings, 0 replies; 55+ messages in thread
From: Laurent Dufour @ 2018-04-10 15:25 UTC (permalink / raw)
  To: linux-arm-kernel

The per architecture __HAVE_ARCH_PTE_SPECIAL is defined statically in the
per architecture header files. This doesn't allow to make other
configuration dependent on it.

The first patch of this series is replacing __HAVE_ARCH_PTE_SPECIAL by
CONFIG_ARCH_HAS_PTE_SPECIAL defined into the Kconfig files,
setting it automatically when architectures was already setting it in
header file.

The second patch is removing the odd define HAVE_PTE_SPECIAL which is a
duplicate of CONFIG_ARCH_HAS_PTE_SPECIAL.

There is no functional change introduced by this series.

Laurent Dufour (2):
  mm: introduce ARCH_HAS_PTE_SPECIAL
  mm: remove odd HAVE_PTE_SPECIAL

 .../features/vm/pte_special/arch-support.txt       |  2 +-
 arch/arc/Kconfig                                   |  1 +
 arch/arc/include/asm/pgtable.h                     |  2 --
 arch/arm/Kconfig                                   |  1 +
 arch/arm/include/asm/pgtable-3level.h              |  1 -
 arch/arm64/Kconfig                                 |  1 +
 arch/arm64/include/asm/pgtable.h                   |  2 --
 arch/powerpc/Kconfig                               |  1 +
 arch/powerpc/include/asm/book3s/64/pgtable.h       |  3 ---
 arch/powerpc/include/asm/pte-common.h              |  3 ---
 arch/riscv/Kconfig                                 |  1 +
 arch/s390/Kconfig                                  |  1 +
 arch/s390/include/asm/pgtable.h                    |  1 -
 arch/sh/Kconfig                                    |  1 +
 arch/sh/include/asm/pgtable.h                      |  2 --
 arch/sparc/Kconfig                                 |  1 +
 arch/sparc/include/asm/pgtable_64.h                |  3 ---
 arch/x86/Kconfig                                   |  1 +
 arch/x86/include/asm/pgtable_types.h               |  1 -
 include/linux/pfn_t.h                              |  4 ++--
 mm/Kconfig                                         |  3 +++
 mm/gup.c                                           |  4 ++--
 mm/memory.c                                        | 23 ++++++++++------------
 23 files changed, 27 insertions(+), 36 deletions(-)

-- 
2.7.4

^ permalink raw reply	[flat|nested] 55+ messages in thread
* [PATCH v2 1/2] mm: introduce ARCH_HAS_PTE_SPECIAL
  2018-04-10 15:25 ` Laurent Dufour
                     ` (3 preceding siblings ...)
  (?)
@ 2018-04-10 15:25   ` Laurent Dufour
  -1 siblings, 0 replies; 55+ messages in thread
From: Laurent Dufour @ 2018-04-10 15:25 UTC (permalink / raw)
  To: linux-arm-kernel

Currently the PTE special supports is turned on in per architecture header
files. Most of the time, it is defined in arch/*/include/asm/pgtable.h
depending or not on some other per architecture static definition.

This patch introduce a new configuration variable to manage this directly
in the Kconfig files. It would later replace __HAVE_ARCH_PTE_SPECIAL.

Here notes for some architecture where the definition of
__HAVE_ARCH_PTE_SPECIAL is not obvious:

arm
 __HAVE_ARCH_PTE_SPECIAL which is currently defined in
arch/arm/include/asm/pgtable-3level.h which is included by
arch/arm/include/asm/pgtable.h when CONFIG_ARM_LPAE is set.
So select ARCH_HAS_PTE_SPECIAL if ARM_LPAE.

powerpc
__HAVE_ARCH_PTE_SPECIAL is defined in 2 files:
 - arch/powerpc/include/asm/book3s/64/pgtable.h
 - arch/powerpc/include/asm/pte-common.h
The first one is included if (PPC_BOOK3S & PPC64) while the second is
included in all the other cases.
So select ARCH_HAS_PTE_SPECIAL all the time.

sparc:
__HAVE_ARCH_PTE_SPECIAL is defined if defined(__sparc__) &&
defined(__arch64__) which are defined through the compiler in
sparc/Makefile if !SPARC32 which I assume to be if SPARC64.
So select ARCH_HAS_PTE_SPECIAL if SPARC64

There is no functional change introduced by this patch.

Suggested-by: Jerome Glisse <jglisse@redhat>
Reviewed-by: Jerome Glisse <jglisse@redhat>
Signed-off-by: Laurent Dufour <ldufour@linux.vnet.ibm.com>
---
 Documentation/features/vm/pte_special/arch-support.txt | 2 +-
 arch/arc/Kconfig                                       | 1 +
 arch/arc/include/asm/pgtable.h                         | 2 --
 arch/arm/Kconfig                                       | 1 +
 arch/arm/include/asm/pgtable-3level.h                  | 1 -
 arch/arm64/Kconfig                                     | 1 +
 arch/arm64/include/asm/pgtable.h                       | 2 --
 arch/powerpc/Kconfig                                   | 1 +
 arch/powerpc/include/asm/book3s/64/pgtable.h           | 3 ---
 arch/powerpc/include/asm/pte-common.h                  | 3 ---
 arch/riscv/Kconfig                                     | 1 +
 arch/s390/Kconfig                                      | 1 +
 arch/s390/include/asm/pgtable.h                        | 1 -
 arch/sh/Kconfig                                        | 1 +
 arch/sh/include/asm/pgtable.h                          | 2 --
 arch/sparc/Kconfig                                     | 1 +
 arch/sparc/include/asm/pgtable_64.h                    | 3 ---
 arch/x86/Kconfig                                       | 1 +
 arch/x86/include/asm/pgtable_types.h                   | 1 -
 include/linux/pfn_t.h                                  | 4 ++--
 mm/Kconfig                                             | 3 +++
 mm/gup.c                                               | 4 ++--
 mm/memory.c                                            | 2 +-
 23 files changed, 18 insertions(+), 24 deletions(-)

diff --git a/Documentation/features/vm/pte_special/arch-support.txt b/Documentation/features/vm/pte_special/arch-support.txt
index 055004f467d2..cd05924ea875 100644
--- a/Documentation/features/vm/pte_special/arch-support.txt
+++ b/Documentation/features/vm/pte_special/arch-support.txt
@@ -1,6 +1,6 @@
 #
 # Feature name:          pte_special
-#         Kconfig:       __HAVE_ARCH_PTE_SPECIAL
+#         Kconfig:       ARCH_HAS_PTE_SPECIAL
 #         description:   arch supports the pte_special()/pte_mkspecial() VM APIs
 #
     -----------------------
diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig
index d76bf4a83740..8516e2b0239a 100644
--- a/arch/arc/Kconfig
+++ b/arch/arc/Kconfig
@@ -44,6 +44,7 @@ config ARC
 	select HAVE_GENERIC_DMA_COHERENT
 	select HAVE_KERNEL_GZIP
 	select HAVE_KERNEL_LZMA
+	select ARCH_HAS_PTE_SPECIAL
 
 config MIGHT_HAVE_PCI
 	bool
diff --git a/arch/arc/include/asm/pgtable.h b/arch/arc/include/asm/pgtable.h
index 08fe33830d4b..8ec5599a0957 100644
--- a/arch/arc/include/asm/pgtable.h
+++ b/arch/arc/include/asm/pgtable.h
@@ -320,8 +320,6 @@ PTE_BIT_FUNC(mkexec,	|= (_PAGE_EXECUTE));
 PTE_BIT_FUNC(mkspecial,	|= (_PAGE_SPECIAL));
 PTE_BIT_FUNC(mkhuge,	|= (_PAGE_HW_SZ));
 
-#define __HAVE_ARCH_PTE_SPECIAL
-
 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 {
 	return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot));
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index a7f8e7f4b88f..c088c851b235 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -8,6 +8,7 @@ config ARM
 	select ARCH_HAS_DEVMEM_IS_ALLOWED
 	select ARCH_HAS_ELF_RANDOMIZE
 	select ARCH_HAS_FORTIFY_SOURCE
+	select ARCH_HAS_PTE_SPECIAL if ARM_LPAE
 	select ARCH_HAS_SET_MEMORY
 	select ARCH_HAS_PHYS_TO_DMA
 	select ARCH_HAS_STRICT_KERNEL_RWX if MMU && !XIP_KERNEL
diff --git a/arch/arm/include/asm/pgtable-3level.h b/arch/arm/include/asm/pgtable-3level.h
index 2a4836087358..6d50a11d7793 100644
--- a/arch/arm/include/asm/pgtable-3level.h
+++ b/arch/arm/include/asm/pgtable-3level.h
@@ -219,7 +219,6 @@ static inline pte_t pte_mkspecial(pte_t pte)
 	pte_val(pte) |= L_PTE_SPECIAL;
 	return pte;
 }
-#define	__HAVE_ARCH_PTE_SPECIAL
 
 #define pmd_write(pmd)		(pmd_isclear((pmd), L_PMD_SECT_RDONLY))
 #define pmd_dirty(pmd)		(pmd_isset((pmd), L_PMD_SECT_DIRTY))
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index eb2cf4938f6d..9a3f1b1ab50c 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -17,6 +17,7 @@ config ARM64
 	select ARCH_HAS_GIGANTIC_PAGE if (MEMORY_ISOLATION && COMPACTION) || CMA
 	select ARCH_HAS_KCOV
 	select ARCH_HAS_MEMBARRIER_SYNC_CORE
+	select ARCH_HAS_PTE_SPECIAL
 	select ARCH_HAS_SET_MEMORY
 	select ARCH_HAS_SG_CHAIN
 	select ARCH_HAS_STRICT_KERNEL_RWX
diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
index 7e2c27e63cd8..b96c8a186908 100644
--- a/arch/arm64/include/asm/pgtable.h
+++ b/arch/arm64/include/asm/pgtable.h
@@ -306,8 +306,6 @@ static inline int pte_same(pte_t pte_a, pte_t pte_b)
 #define HPAGE_MASK		(~(HPAGE_SIZE - 1))
 #define HUGETLB_PAGE_ORDER	(HPAGE_SHIFT - PAGE_SHIFT)
 
-#define __HAVE_ARCH_PTE_SPECIAL
-
 static inline pte_t pgd_pte(pgd_t pgd)
 {
 	return __pte(pgd_val(pgd));
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index c32a181a7cbb..f7415fe25c07 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -141,6 +141,7 @@ config PPC
 	select ARCH_HAS_GCOV_PROFILE_ALL
 	select ARCH_HAS_PHYS_TO_DMA
 	select ARCH_HAS_PMEM_API                if PPC64
+	select ARCH_HAS_PTE_SPECIAL
 	select ARCH_HAS_MEMBARRIER_CALLBACKS
 	select ARCH_HAS_SCALED_CPUTIME		if VIRT_CPU_ACCOUNTING_NATIVE
 	select ARCH_HAS_SG_CHAIN
diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h b/arch/powerpc/include/asm/book3s/64/pgtable.h
index 47b5ffc8715d..b3ac8948b257 100644
--- a/arch/powerpc/include/asm/book3s/64/pgtable.h
+++ b/arch/powerpc/include/asm/book3s/64/pgtable.h
@@ -319,9 +319,6 @@ extern unsigned long pci_io_base;
 /* Advertise special mapping type for AGP */
 #define HAVE_PAGE_AGP
 
-/* Advertise support for _PAGE_SPECIAL */
-#define __HAVE_ARCH_PTE_SPECIAL
-
 #ifndef __ASSEMBLY__
 
 /*
diff --git a/arch/powerpc/include/asm/pte-common.h b/arch/powerpc/include/asm/pte-common.h
index c4a72c7a8c83..03dfddb1f49a 100644
--- a/arch/powerpc/include/asm/pte-common.h
+++ b/arch/powerpc/include/asm/pte-common.h
@@ -216,9 +216,6 @@ static inline bool pte_user(pte_t pte)
 #define PAGE_AGP		(PAGE_KERNEL_NC)
 #define HAVE_PAGE_AGP
 
-/* Advertise support for _PAGE_SPECIAL */
-#define __HAVE_ARCH_PTE_SPECIAL
-
 #ifndef _PAGE_READ
 /* if not defined, we should not find _PAGE_WRITE too */
 #define _PAGE_READ 0
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index 5287c1441d66..b01c183836e5 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -34,6 +34,7 @@ config RISCV
 	select THREAD_INFO_IN_TASK
 	select RISCV_TIMER
 	select GENERIC_IRQ_MULTI_HANDLER
+	select ARCH_HAS_PTE_SPECIAL
 
 config MMU
 	def_bool y
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index 32a0d5b958bf..5f1f4997e7e9 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -72,6 +72,7 @@ config S390
 	select ARCH_HAS_GCOV_PROFILE_ALL
 	select ARCH_HAS_GIGANTIC_PAGE if (MEMORY_ISOLATION && COMPACTION) || CMA
 	select ARCH_HAS_KCOV
+	select ARCH_HAS_PTE_SPECIAL
 	select ARCH_HAS_SET_MEMORY
 	select ARCH_HAS_SG_CHAIN
 	select ARCH_HAS_STRICT_KERNEL_RWX
diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h
index 2d24d33bf188..9809694e1389 100644
--- a/arch/s390/include/asm/pgtable.h
+++ b/arch/s390/include/asm/pgtable.h
@@ -171,7 +171,6 @@ static inline int is_module_addr(void *addr)
 #define _PAGE_WRITE	0x020		/* SW pte write bit */
 #define _PAGE_SPECIAL	0x040		/* SW associated with special page */
 #define _PAGE_UNUSED	0x080		/* SW bit for pgste usage state */
-#define __HAVE_ARCH_PTE_SPECIAL
 
 #ifdef CONFIG_MEM_SOFT_DIRTY
 #define _PAGE_SOFT_DIRTY 0x002		/* SW pte soft dirty bit */
diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index 97fe29316476..a6c75b6806d2 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -50,6 +50,7 @@ config SUPERH
 	select HAVE_ARCH_AUDITSYSCALL
 	select HAVE_FUTEX_CMPXCHG if FUTEX
 	select HAVE_NMI
+	select ARCH_HAS_PTE_SPECIAL
 	help
 	  The SuperH is a RISC processor targeted for use in embedded systems
 	  and consumer electronics; it was also used in the Sega Dreamcast
diff --git a/arch/sh/include/asm/pgtable.h b/arch/sh/include/asm/pgtable.h
index 89c513a982fc..f6abfe2bca93 100644
--- a/arch/sh/include/asm/pgtable.h
+++ b/arch/sh/include/asm/pgtable.h
@@ -156,8 +156,6 @@ extern void page_table_range_init(unsigned long start, unsigned long end,
 #define HAVE_ARCH_UNMAPPED_AREA
 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
 
-#define __HAVE_ARCH_PTE_SPECIAL
-
 #include <asm-generic/pgtable.h>
 
 #endif /* __ASM_SH_PGTABLE_H */
diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
index 8767e45f1b2b..6b5a4f05dcb2 100644
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig
@@ -86,6 +86,7 @@ config SPARC64
 	select ARCH_USE_QUEUED_SPINLOCKS
 	select GENERIC_TIME_VSYSCALL
 	select ARCH_CLOCKSOURCE_DATA
+	select ARCH_HAS_PTE_SPECIAL
 
 config ARCH_DEFCONFIG
 	string
diff --git a/arch/sparc/include/asm/pgtable_64.h b/arch/sparc/include/asm/pgtable_64.h
index 44d6ac47e035..1393a8ac596b 100644
--- a/arch/sparc/include/asm/pgtable_64.h
+++ b/arch/sparc/include/asm/pgtable_64.h
@@ -117,9 +117,6 @@ bool kern_addr_valid(unsigned long addr);
 #define _PAGE_PMD_HUGE    _AC(0x0100000000000000,UL) /* Huge page            */
 #define _PAGE_PUD_HUGE    _PAGE_PMD_HUGE
 
-/* Advertise support for _PAGE_SPECIAL */
-#define __HAVE_ARCH_PTE_SPECIAL
-
 /* SUN4U pte bits... */
 #define _PAGE_SZ4MB_4U	  _AC(0x6000000000000000,UL) /* 4MB Page             */
 #define _PAGE_SZ512K_4U	  _AC(0x4000000000000000,UL) /* 512K Page            */
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index bf4ddea48e61..3f5fb25486bf 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -56,6 +56,7 @@ config X86
 	select ARCH_HAS_KCOV			if X86_64
 	select ARCH_HAS_MEMBARRIER_SYNC_CORE
 	select ARCH_HAS_PMEM_API		if X86_64
+	select ARCH_HAS_PTE_SPECIAL
 	select ARCH_HAS_REFCOUNT
 	select ARCH_HAS_UACCESS_FLUSHCACHE	if X86_64
 	select ARCH_HAS_SET_MEMORY
diff --git a/arch/x86/include/asm/pgtable_types.h b/arch/x86/include/asm/pgtable_types.h
index acfe755562a6..3e195728d7d1 100644
--- a/arch/x86/include/asm/pgtable_types.h
+++ b/arch/x86/include/asm/pgtable_types.h
@@ -65,7 +65,6 @@
 #define _PAGE_PKEY_BIT2	(_AT(pteval_t, 0))
 #define _PAGE_PKEY_BIT3	(_AT(pteval_t, 0))
 #endif
-#define __HAVE_ARCH_PTE_SPECIAL
 
 #define _PAGE_PKEY_MASK (_PAGE_PKEY_BIT0 | \
 			 _PAGE_PKEY_BIT1 | \
diff --git a/include/linux/pfn_t.h b/include/linux/pfn_t.h
index a03c2642a87c..21713dc14ce2 100644
--- a/include/linux/pfn_t.h
+++ b/include/linux/pfn_t.h
@@ -122,7 +122,7 @@ pud_t pud_mkdevmap(pud_t pud);
 #endif
 #endif /* __HAVE_ARCH_PTE_DEVMAP */
 
-#ifdef __HAVE_ARCH_PTE_SPECIAL
+#ifdef CONFIG_ARCH_HAS_PTE_SPECIAL
 static inline bool pfn_t_special(pfn_t pfn)
 {
 	return (pfn.val & PFN_SPECIAL) = PFN_SPECIAL;
@@ -132,5 +132,5 @@ static inline bool pfn_t_special(pfn_t pfn)
 {
 	return false;
 }
-#endif /* __HAVE_ARCH_PTE_SPECIAL */
+#endif /* CONFIG_ARCH_HAS_PTE_SPECIAL */
 #endif /* _LINUX_PFN_T_H_ */
diff --git a/mm/Kconfig b/mm/Kconfig
index d5004d82a1d6..1ea3e4a6a123 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -752,3 +752,6 @@ config GUP_BENCHMARK
 	  performance of get_user_pages_fast().
 
 	  See tools/testing/selftests/vm/gup_benchmark.c
+
+config ARCH_HAS_PTE_SPECIAL
+	bool
diff --git a/mm/gup.c b/mm/gup.c
index f296df6cf666..b044a3d14dc5 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -1351,7 +1351,7 @@ static void undo_dev_pagemap(int *nr, int nr_start, struct page **pages)
 	}
 }
 
-#ifdef __HAVE_ARCH_PTE_SPECIAL
+#ifdef CONFIG_ARCH_HAS_PTE_SPECIAL
 static int gup_pte_range(pmd_t pmd, unsigned long addr, unsigned long end,
 			 int write, struct page **pages, int *nr)
 {
@@ -1427,7 +1427,7 @@ static int gup_pte_range(pmd_t pmd, unsigned long addr, unsigned long end,
 {
 	return 0;
 }
-#endif /* __HAVE_ARCH_PTE_SPECIAL */
+#endif /* CONFIG_ARCH_HAS_PTE_SPECIAL */
 
 #if defined(__HAVE_ARCH_PTE_DEVMAP) && defined(CONFIG_TRANSPARENT_HUGEPAGE)
 static int __gup_device_huge(unsigned long pfn, unsigned long addr,
diff --git a/mm/memory.c b/mm/memory.c
index a1f990e33e38..96910c625daa 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -817,7 +817,7 @@ static void print_bad_pte(struct vm_area_struct *vma, unsigned long addr,
  * PFNMAP mappings in order to support COWable mappings.
  *
  */
-#ifdef __HAVE_ARCH_PTE_SPECIAL
+#ifdef CONFIG_ARCH_HAS_PTE_SPECIAL
 # define HAVE_PTE_SPECIAL 1
 #else
 # define HAVE_PTE_SPECIAL 0
-- 
2.7.4


^ permalink raw reply related	[flat|nested] 55+ messages in thread
* [PATCH v2 1/2] mm: introduce ARCH_HAS_PTE_SPECIAL
@ 2018-04-10 15:25   ` Laurent Dufour
  0 siblings, 0 replies; 55+ messages in thread
From: Laurent Dufour @ 2018-04-10 15:25 UTC (permalink / raw)
  To: linux-kernel, linux-mm, linuxppc-dev, x86, linux-doc,
	linux-snps-arc, linux-arm-kernel, linux-riscv, linux-s390,
	linux-sh, sparclinux, Jerome Glisse, mhocko, aneesh.kumar, akpm,
	mpe, benh, paulus, Jonathan Corbet, Catalin Marinas, Will Deacon,
	Yoshinori Sato, Rich Felker, David S . Miller, Thomas Gleixner,
	Ingo Molnar, Vineet Gupta, Palmer Dabbelt, Albert Ou,
	Martin Schwidefsky, Heiko Carstens, David Rientjes

Currently the PTE special supports is turned on in per architecture header
files. Most of the time, it is defined in arch/*/include/asm/pgtable.h
depending or not on some other per architecture static definition.

This patch introduce a new configuration variable to manage this directly
in the Kconfig files. It would later replace __HAVE_ARCH_PTE_SPECIAL.

Here notes for some architecture where the definition of
__HAVE_ARCH_PTE_SPECIAL is not obvious:

arm
 __HAVE_ARCH_PTE_SPECIAL which is currently defined in
arch/arm/include/asm/pgtable-3level.h which is included by
arch/arm/include/asm/pgtable.h when CONFIG_ARM_LPAE is set.
So select ARCH_HAS_PTE_SPECIAL if ARM_LPAE.

powerpc
__HAVE_ARCH_PTE_SPECIAL is defined in 2 files:
 - arch/powerpc/include/asm/book3s/64/pgtable.h
 - arch/powerpc/include/asm/pte-common.h
The first one is included if (PPC_BOOK3S & PPC64) while the second is
included in all the other cases.
So select ARCH_HAS_PTE_SPECIAL all the time.

sparc:
__HAVE_ARCH_PTE_SPECIAL is defined if defined(__sparc__) &&
defined(__arch64__) which are defined through the compiler in
sparc/Makefile if !SPARC32 which I assume to be if SPARC64.
So select ARCH_HAS_PTE_SPECIAL if SPARC64

There is no functional change introduced by this patch.

Suggested-by: Jerome Glisse <jglisse@redhat>
Reviewed-by: Jerome Glisse <jglisse@redhat>
Signed-off-by: Laurent Dufour <ldufour@linux.vnet.ibm.com>
---
 Documentation/features/vm/pte_special/arch-support.txt | 2 +-
 arch/arc/Kconfig                                       | 1 +
 arch/arc/include/asm/pgtable.h                         | 2 --
 arch/arm/Kconfig                                       | 1 +
 arch/arm/include/asm/pgtable-3level.h                  | 1 -
 arch/arm64/Kconfig                                     | 1 +
 arch/arm64/include/asm/pgtable.h                       | 2 --
 arch/powerpc/Kconfig                                   | 1 +
 arch/powerpc/include/asm/book3s/64/pgtable.h           | 3 ---
 arch/powerpc/include/asm/pte-common.h                  | 3 ---
 arch/riscv/Kconfig                                     | 1 +
 arch/s390/Kconfig                                      | 1 +
 arch/s390/include/asm/pgtable.h                        | 1 -
 arch/sh/Kconfig                                        | 1 +
 arch/sh/include/asm/pgtable.h                          | 2 --
 arch/sparc/Kconfig                                     | 1 +
 arch/sparc/include/asm/pgtable_64.h                    | 3 ---
 arch/x86/Kconfig                                       | 1 +
 arch/x86/include/asm/pgtable_types.h                   | 1 -
 include/linux/pfn_t.h                                  | 4 ++--
 mm/Kconfig                                             | 3 +++
 mm/gup.c                                               | 4 ++--
 mm/memory.c                                            | 2 +-
 23 files changed, 18 insertions(+), 24 deletions(-)

diff --git a/Documentation/features/vm/pte_special/arch-support.txt b/Documentation/features/vm/pte_special/arch-support.txt
index 055004f467d2..cd05924ea875 100644
--- a/Documentation/features/vm/pte_special/arch-support.txt
+++ b/Documentation/features/vm/pte_special/arch-support.txt
@@ -1,6 +1,6 @@
 #
 # Feature name:          pte_special
-#         Kconfig:       __HAVE_ARCH_PTE_SPECIAL
+#         Kconfig:       ARCH_HAS_PTE_SPECIAL
 #         description:   arch supports the pte_special()/pte_mkspecial() VM APIs
 #
     -----------------------
diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig
index d76bf4a83740..8516e2b0239a 100644
--- a/arch/arc/Kconfig
+++ b/arch/arc/Kconfig
@@ -44,6 +44,7 @@ config ARC
 	select HAVE_GENERIC_DMA_COHERENT
 	select HAVE_KERNEL_GZIP
 	select HAVE_KERNEL_LZMA
+	select ARCH_HAS_PTE_SPECIAL
 
 config MIGHT_HAVE_PCI
 	bool
diff --git a/arch/arc/include/asm/pgtable.h b/arch/arc/include/asm/pgtable.h
index 08fe33830d4b..8ec5599a0957 100644
--- a/arch/arc/include/asm/pgtable.h
+++ b/arch/arc/include/asm/pgtable.h
@@ -320,8 +320,6 @@ PTE_BIT_FUNC(mkexec,	|= (_PAGE_EXECUTE));
 PTE_BIT_FUNC(mkspecial,	|= (_PAGE_SPECIAL));
 PTE_BIT_FUNC(mkhuge,	|= (_PAGE_HW_SZ));
 
-#define __HAVE_ARCH_PTE_SPECIAL
-
 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 {
 	return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot));
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index a7f8e7f4b88f..c088c851b235 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -8,6 +8,7 @@ config ARM
 	select ARCH_HAS_DEVMEM_IS_ALLOWED
 	select ARCH_HAS_ELF_RANDOMIZE
 	select ARCH_HAS_FORTIFY_SOURCE
+	select ARCH_HAS_PTE_SPECIAL if ARM_LPAE
 	select ARCH_HAS_SET_MEMORY
 	select ARCH_HAS_PHYS_TO_DMA
 	select ARCH_HAS_STRICT_KERNEL_RWX if MMU && !XIP_KERNEL
diff --git a/arch/arm/include/asm/pgtable-3level.h b/arch/arm/include/asm/pgtable-3level.h
index 2a4836087358..6d50a11d7793 100644
--- a/arch/arm/include/asm/pgtable-3level.h
+++ b/arch/arm/include/asm/pgtable-3level.h
@@ -219,7 +219,6 @@ static inline pte_t pte_mkspecial(pte_t pte)
 	pte_val(pte) |= L_PTE_SPECIAL;
 	return pte;
 }
-#define	__HAVE_ARCH_PTE_SPECIAL
 
 #define pmd_write(pmd)		(pmd_isclear((pmd), L_PMD_SECT_RDONLY))
 #define pmd_dirty(pmd)		(pmd_isset((pmd), L_PMD_SECT_DIRTY))
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index eb2cf4938f6d..9a3f1b1ab50c 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -17,6 +17,7 @@ config ARM64
 	select ARCH_HAS_GIGANTIC_PAGE if (MEMORY_ISOLATION && COMPACTION) || CMA
 	select ARCH_HAS_KCOV
 	select ARCH_HAS_MEMBARRIER_SYNC_CORE
+	select ARCH_HAS_PTE_SPECIAL
 	select ARCH_HAS_SET_MEMORY
 	select ARCH_HAS_SG_CHAIN
 	select ARCH_HAS_STRICT_KERNEL_RWX
diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
index 7e2c27e63cd8..b96c8a186908 100644
--- a/arch/arm64/include/asm/pgtable.h
+++ b/arch/arm64/include/asm/pgtable.h
@@ -306,8 +306,6 @@ static inline int pte_same(pte_t pte_a, pte_t pte_b)
 #define HPAGE_MASK		(~(HPAGE_SIZE - 1))
 #define HUGETLB_PAGE_ORDER	(HPAGE_SHIFT - PAGE_SHIFT)
 
-#define __HAVE_ARCH_PTE_SPECIAL
-
 static inline pte_t pgd_pte(pgd_t pgd)
 {
 	return __pte(pgd_val(pgd));
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index c32a181a7cbb..f7415fe25c07 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -141,6 +141,7 @@ config PPC
 	select ARCH_HAS_GCOV_PROFILE_ALL
 	select ARCH_HAS_PHYS_TO_DMA
 	select ARCH_HAS_PMEM_API                if PPC64
+	select ARCH_HAS_PTE_SPECIAL
 	select ARCH_HAS_MEMBARRIER_CALLBACKS
 	select ARCH_HAS_SCALED_CPUTIME		if VIRT_CPU_ACCOUNTING_NATIVE
 	select ARCH_HAS_SG_CHAIN
diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h b/arch/powerpc/include/asm/book3s/64/pgtable.h
index 47b5ffc8715d..b3ac8948b257 100644
--- a/arch/powerpc/include/asm/book3s/64/pgtable.h
+++ b/arch/powerpc/include/asm/book3s/64/pgtable.h
@@ -319,9 +319,6 @@ extern unsigned long pci_io_base;
 /* Advertise special mapping type for AGP */
 #define HAVE_PAGE_AGP
 
-/* Advertise support for _PAGE_SPECIAL */
-#define __HAVE_ARCH_PTE_SPECIAL
-
 #ifndef __ASSEMBLY__
 
 /*
diff --git a/arch/powerpc/include/asm/pte-common.h b/arch/powerpc/include/asm/pte-common.h
index c4a72c7a8c83..03dfddb1f49a 100644
--- a/arch/powerpc/include/asm/pte-common.h
+++ b/arch/powerpc/include/asm/pte-common.h
@@ -216,9 +216,6 @@ static inline bool pte_user(pte_t pte)
 #define PAGE_AGP		(PAGE_KERNEL_NC)
 #define HAVE_PAGE_AGP
 
-/* Advertise support for _PAGE_SPECIAL */
-#define __HAVE_ARCH_PTE_SPECIAL
-
 #ifndef _PAGE_READ
 /* if not defined, we should not find _PAGE_WRITE too */
 #define _PAGE_READ 0
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index 5287c1441d66..b01c183836e5 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -34,6 +34,7 @@ config RISCV
 	select THREAD_INFO_IN_TASK
 	select RISCV_TIMER
 	select GENERIC_IRQ_MULTI_HANDLER
+	select ARCH_HAS_PTE_SPECIAL
 
 config MMU
 	def_bool y
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index 32a0d5b958bf..5f1f4997e7e9 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -72,6 +72,7 @@ config S390
 	select ARCH_HAS_GCOV_PROFILE_ALL
 	select ARCH_HAS_GIGANTIC_PAGE if (MEMORY_ISOLATION && COMPACTION) || CMA
 	select ARCH_HAS_KCOV
+	select ARCH_HAS_PTE_SPECIAL
 	select ARCH_HAS_SET_MEMORY
 	select ARCH_HAS_SG_CHAIN
 	select ARCH_HAS_STRICT_KERNEL_RWX
diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h
index 2d24d33bf188..9809694e1389 100644
--- a/arch/s390/include/asm/pgtable.h
+++ b/arch/s390/include/asm/pgtable.h
@@ -171,7 +171,6 @@ static inline int is_module_addr(void *addr)
 #define _PAGE_WRITE	0x020		/* SW pte write bit */
 #define _PAGE_SPECIAL	0x040		/* SW associated with special page */
 #define _PAGE_UNUSED	0x080		/* SW bit for pgste usage state */
-#define __HAVE_ARCH_PTE_SPECIAL
 
 #ifdef CONFIG_MEM_SOFT_DIRTY
 #define _PAGE_SOFT_DIRTY 0x002		/* SW pte soft dirty bit */
diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index 97fe29316476..a6c75b6806d2 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -50,6 +50,7 @@ config SUPERH
 	select HAVE_ARCH_AUDITSYSCALL
 	select HAVE_FUTEX_CMPXCHG if FUTEX
 	select HAVE_NMI
+	select ARCH_HAS_PTE_SPECIAL
 	help
 	  The SuperH is a RISC processor targeted for use in embedded systems
 	  and consumer electronics; it was also used in the Sega Dreamcast
diff --git a/arch/sh/include/asm/pgtable.h b/arch/sh/include/asm/pgtable.h
index 89c513a982fc..f6abfe2bca93 100644
--- a/arch/sh/include/asm/pgtable.h
+++ b/arch/sh/include/asm/pgtable.h
@@ -156,8 +156,6 @@ extern void page_table_range_init(unsigned long start, unsigned long end,
 #define HAVE_ARCH_UNMAPPED_AREA
 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
 
-#define __HAVE_ARCH_PTE_SPECIAL
-
 #include <asm-generic/pgtable.h>
 
 #endif /* __ASM_SH_PGTABLE_H */
diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
index 8767e45f1b2b..6b5a4f05dcb2 100644
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig
@@ -86,6 +86,7 @@ config SPARC64
 	select ARCH_USE_QUEUED_SPINLOCKS
 	select GENERIC_TIME_VSYSCALL
 	select ARCH_CLOCKSOURCE_DATA
+	select ARCH_HAS_PTE_SPECIAL
 
 config ARCH_DEFCONFIG
 	string
diff --git a/arch/sparc/include/asm/pgtable_64.h b/arch/sparc/include/asm/pgtable_64.h
index 44d6ac47e035..1393a8ac596b 100644
--- a/arch/sparc/include/asm/pgtable_64.h
+++ b/arch/sparc/include/asm/pgtable_64.h
@@ -117,9 +117,6 @@ bool kern_addr_valid(unsigned long addr);
 #define _PAGE_PMD_HUGE    _AC(0x0100000000000000,UL) /* Huge page            */
 #define _PAGE_PUD_HUGE    _PAGE_PMD_HUGE
 
-/* Advertise support for _PAGE_SPECIAL */
-#define __HAVE_ARCH_PTE_SPECIAL
-
 /* SUN4U pte bits... */
 #define _PAGE_SZ4MB_4U	  _AC(0x6000000000000000,UL) /* 4MB Page             */
 #define _PAGE_SZ512K_4U	  _AC(0x4000000000000000,UL) /* 512K Page            */
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index bf4ddea48e61..3f5fb25486bf 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -56,6 +56,7 @@ config X86
 	select ARCH_HAS_KCOV			if X86_64
 	select ARCH_HAS_MEMBARRIER_SYNC_CORE
 	select ARCH_HAS_PMEM_API		if X86_64
+	select ARCH_HAS_PTE_SPECIAL
 	select ARCH_HAS_REFCOUNT
 	select ARCH_HAS_UACCESS_FLUSHCACHE	if X86_64
 	select ARCH_HAS_SET_MEMORY
diff --git a/arch/x86/include/asm/pgtable_types.h b/arch/x86/include/asm/pgtable_types.h
index acfe755562a6..3e195728d7d1 100644
--- a/arch/x86/include/asm/pgtable_types.h
+++ b/arch/x86/include/asm/pgtable_types.h
@@ -65,7 +65,6 @@
 #define _PAGE_PKEY_BIT2	(_AT(pteval_t, 0))
 #define _PAGE_PKEY_BIT3	(_AT(pteval_t, 0))
 #endif
-#define __HAVE_ARCH_PTE_SPECIAL
 
 #define _PAGE_PKEY_MASK (_PAGE_PKEY_BIT0 | \
 			 _PAGE_PKEY_BIT1 | \
diff --git a/include/linux/pfn_t.h b/include/linux/pfn_t.h
index a03c2642a87c..21713dc14ce2 100644
--- a/include/linux/pfn_t.h
+++ b/include/linux/pfn_t.h
@@ -122,7 +122,7 @@ pud_t pud_mkdevmap(pud_t pud);
 #endif
 #endif /* __HAVE_ARCH_PTE_DEVMAP */
 
-#ifdef __HAVE_ARCH_PTE_SPECIAL
+#ifdef CONFIG_ARCH_HAS_PTE_SPECIAL
 static inline bool pfn_t_special(pfn_t pfn)
 {
 	return (pfn.val & PFN_SPECIAL) == PFN_SPECIAL;
@@ -132,5 +132,5 @@ static inline bool pfn_t_special(pfn_t pfn)
 {
 	return false;
 }
-#endif /* __HAVE_ARCH_PTE_SPECIAL */
+#endif /* CONFIG_ARCH_HAS_PTE_SPECIAL */
 #endif /* _LINUX_PFN_T_H_ */
diff --git a/mm/Kconfig b/mm/Kconfig
index d5004d82a1d6..1ea3e4a6a123 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -752,3 +752,6 @@ config GUP_BENCHMARK
 	  performance of get_user_pages_fast().
 
 	  See tools/testing/selftests/vm/gup_benchmark.c
+
+config ARCH_HAS_PTE_SPECIAL
+	bool
diff --git a/mm/gup.c b/mm/gup.c
index f296df6cf666..b044a3d14dc5 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -1351,7 +1351,7 @@ static void undo_dev_pagemap(int *nr, int nr_start, struct page **pages)
 	}
 }
 
-#ifdef __HAVE_ARCH_PTE_SPECIAL
+#ifdef CONFIG_ARCH_HAS_PTE_SPECIAL
 static int gup_pte_range(pmd_t pmd, unsigned long addr, unsigned long end,
 			 int write, struct page **pages, int *nr)
 {
@@ -1427,7 +1427,7 @@ static int gup_pte_range(pmd_t pmd, unsigned long addr, unsigned long end,
 {
 	return 0;
 }
-#endif /* __HAVE_ARCH_PTE_SPECIAL */
+#endif /* CONFIG_ARCH_HAS_PTE_SPECIAL */
 
 #if defined(__HAVE_ARCH_PTE_DEVMAP) && defined(CONFIG_TRANSPARENT_HUGEPAGE)
 static int __gup_device_huge(unsigned long pfn, unsigned long addr,
diff --git a/mm/memory.c b/mm/memory.c
index a1f990e33e38..96910c625daa 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -817,7 +817,7 @@ static void print_bad_pte(struct vm_area_struct *vma, unsigned long addr,
  * PFNMAP mappings in order to support COWable mappings.
  *
  */
-#ifdef __HAVE_ARCH_PTE_SPECIAL
+#ifdef CONFIG_ARCH_HAS_PTE_SPECIAL
 # define HAVE_PTE_SPECIAL 1
 #else
 # define HAVE_PTE_SPECIAL 0
-- 
2.7.4

^ permalink raw reply related	[flat|nested] 55+ messages in thread
* [PATCH v2 1/2] mm: introduce ARCH_HAS_PTE_SPECIAL
@ 2018-04-10 15:25   ` Laurent Dufour
  0 siblings, 0 replies; 55+ messages in thread
From: Laurent Dufour @ 2018-04-10 15:25 UTC (permalink / raw)
  To: linux-kernel, linux-mm, linuxppc-dev, x86, linux-doc,
	linux-snps-arc, linux-arm-kernel, linux-riscv, linux-s390,
	linux-sh, sparclinux, Jerome Glisse, mhocko, aneesh.kumar, akpm,
	mpe, benh, paulus, Jonathan Corbet, Catalin Marinas, Will Deacon,
	Yoshinori Sato, Rich Felker, David S . Miller, Thomas Gleixner,
	Ingo Molnar, Vineet Gupta, Palmer Dabbelt, Albert Ou,
	Martin Schwidefsky, Heiko Carstens, David Rientjes

Currently the PTE special supports is turned on in per architecture header
files. Most of the time, it is defined in arch/*/include/asm/pgtable.h
depending or not on some other per architecture static definition.

This patch introduce a new configuration variable to manage this directly
in the Kconfig files. It would later replace __HAVE_ARCH_PTE_SPECIAL.

Here notes for some architecture where the definition of
__HAVE_ARCH_PTE_SPECIAL is not obvious:

arm
 __HAVE_ARCH_PTE_SPECIAL which is currently defined in
arch/arm/include/asm/pgtable-3level.h which is included by
arch/arm/include/asm/pgtable.h when CONFIG_ARM_LPAE is set.
So select ARCH_HAS_PTE_SPECIAL if ARM_LPAE.

powerpc
__HAVE_ARCH_PTE_SPECIAL is defined in 2 files:
 - arch/powerpc/include/asm/book3s/64/pgtable.h
 - arch/powerpc/include/asm/pte-common.h
The first one is included if (PPC_BOOK3S & PPC64) while the second is
included in all the other cases.
So select ARCH_HAS_PTE_SPECIAL all the time.

sparc:
__HAVE_ARCH_PTE_SPECIAL is defined if defined(__sparc__) &&
defined(__arch64__) which are defined through the compiler in
sparc/Makefile if !SPARC32 which I assume to be if SPARC64.
So select ARCH_HAS_PTE_SPECIAL if SPARC64

There is no functional change introduced by this patch.

Suggested-by: Jerome Glisse <jglisse@redhat>
Reviewed-by: Jerome Glisse <jglisse@redhat>
Signed-off-by: Laurent Dufour <ldufour@linux.vnet.ibm.com>
---
 Documentation/features/vm/pte_special/arch-support.txt | 2 +-
 arch/arc/Kconfig                                       | 1 +
 arch/arc/include/asm/pgtable.h                         | 2 --
 arch/arm/Kconfig                                       | 1 +
 arch/arm/include/asm/pgtable-3level.h                  | 1 -
 arch/arm64/Kconfig                                     | 1 +
 arch/arm64/include/asm/pgtable.h                       | 2 --
 arch/powerpc/Kconfig                                   | 1 +
 arch/powerpc/include/asm/book3s/64/pgtable.h           | 3 ---
 arch/powerpc/include/asm/pte-common.h                  | 3 ---
 arch/riscv/Kconfig                                     | 1 +
 arch/s390/Kconfig                                      | 1 +
 arch/s390/include/asm/pgtable.h                        | 1 -
 arch/sh/Kconfig                                        | 1 +
 arch/sh/include/asm/pgtable.h                          | 2 --
 arch/sparc/Kconfig                                     | 1 +
 arch/sparc/include/asm/pgtable_64.h                    | 3 ---
 arch/x86/Kconfig                                       | 1 +
 arch/x86/include/asm/pgtable_types.h                   | 1 -
 include/linux/pfn_t.h                                  | 4 ++--
 mm/Kconfig                                             | 3 +++
 mm/gup.c                                               | 4 ++--
 mm/memory.c                                            | 2 +-
 23 files changed, 18 insertions(+), 24 deletions(-)

diff --git a/Documentation/features/vm/pte_special/arch-support.txt b/Documentation/features/vm/pte_special/arch-support.txt
index 055004f467d2..cd05924ea875 100644
--- a/Documentation/features/vm/pte_special/arch-support.txt
+++ b/Documentation/features/vm/pte_special/arch-support.txt
@@ -1,6 +1,6 @@
 #
 # Feature name:          pte_special
-#         Kconfig:       __HAVE_ARCH_PTE_SPECIAL
+#         Kconfig:       ARCH_HAS_PTE_SPECIAL
 #         description:   arch supports the pte_special()/pte_mkspecial() VM APIs
 #
     -----------------------
diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig
index d76bf4a83740..8516e2b0239a 100644
--- a/arch/arc/Kconfig
+++ b/arch/arc/Kconfig
@@ -44,6 +44,7 @@ config ARC
 	select HAVE_GENERIC_DMA_COHERENT
 	select HAVE_KERNEL_GZIP
 	select HAVE_KERNEL_LZMA
+	select ARCH_HAS_PTE_SPECIAL
 
 config MIGHT_HAVE_PCI
 	bool
diff --git a/arch/arc/include/asm/pgtable.h b/arch/arc/include/asm/pgtable.h
index 08fe33830d4b..8ec5599a0957 100644
--- a/arch/arc/include/asm/pgtable.h
+++ b/arch/arc/include/asm/pgtable.h
@@ -320,8 +320,6 @@ PTE_BIT_FUNC(mkexec,	|= (_PAGE_EXECUTE));
 PTE_BIT_FUNC(mkspecial,	|= (_PAGE_SPECIAL));
 PTE_BIT_FUNC(mkhuge,	|= (_PAGE_HW_SZ));
 
-#define __HAVE_ARCH_PTE_SPECIAL
-
 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 {
 	return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot));
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index a7f8e7f4b88f..c088c851b235 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -8,6 +8,7 @@ config ARM
 	select ARCH_HAS_DEVMEM_IS_ALLOWED
 	select ARCH_HAS_ELF_RANDOMIZE
 	select ARCH_HAS_FORTIFY_SOURCE
+	select ARCH_HAS_PTE_SPECIAL if ARM_LPAE
 	select ARCH_HAS_SET_MEMORY
 	select ARCH_HAS_PHYS_TO_DMA
 	select ARCH_HAS_STRICT_KERNEL_RWX if MMU && !XIP_KERNEL
diff --git a/arch/arm/include/asm/pgtable-3level.h b/arch/arm/include/asm/pgtable-3level.h
index 2a4836087358..6d50a11d7793 100644
--- a/arch/arm/include/asm/pgtable-3level.h
+++ b/arch/arm/include/asm/pgtable-3level.h
@@ -219,7 +219,6 @@ static inline pte_t pte_mkspecial(pte_t pte)
 	pte_val(pte) |= L_PTE_SPECIAL;
 	return pte;
 }
-#define	__HAVE_ARCH_PTE_SPECIAL
 
 #define pmd_write(pmd)		(pmd_isclear((pmd), L_PMD_SECT_RDONLY))
 #define pmd_dirty(pmd)		(pmd_isset((pmd), L_PMD_SECT_DIRTY))
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index eb2cf4938f6d..9a3f1b1ab50c 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -17,6 +17,7 @@ config ARM64
 	select ARCH_HAS_GIGANTIC_PAGE if (MEMORY_ISOLATION && COMPACTION) || CMA
 	select ARCH_HAS_KCOV
 	select ARCH_HAS_MEMBARRIER_SYNC_CORE
+	select ARCH_HAS_PTE_SPECIAL
 	select ARCH_HAS_SET_MEMORY
 	select ARCH_HAS_SG_CHAIN
 	select ARCH_HAS_STRICT_KERNEL_RWX
diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
index 7e2c27e63cd8..b96c8a186908 100644
--- a/arch/arm64/include/asm/pgtable.h
+++ b/arch/arm64/include/asm/pgtable.h
@@ -306,8 +306,6 @@ static inline int pte_same(pte_t pte_a, pte_t pte_b)
 #define HPAGE_MASK		(~(HPAGE_SIZE - 1))
 #define HUGETLB_PAGE_ORDER	(HPAGE_SHIFT - PAGE_SHIFT)
 
-#define __HAVE_ARCH_PTE_SPECIAL
-
 static inline pte_t pgd_pte(pgd_t pgd)
 {
 	return __pte(pgd_val(pgd));
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index c32a181a7cbb..f7415fe25c07 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -141,6 +141,7 @@ config PPC
 	select ARCH_HAS_GCOV_PROFILE_ALL
 	select ARCH_HAS_PHYS_TO_DMA
 	select ARCH_HAS_PMEM_API                if PPC64
+	select ARCH_HAS_PTE_SPECIAL
 	select ARCH_HAS_MEMBARRIER_CALLBACKS
 	select ARCH_HAS_SCALED_CPUTIME		if VIRT_CPU_ACCOUNTING_NATIVE
 	select ARCH_HAS_SG_CHAIN
diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h b/arch/powerpc/include/asm/book3s/64/pgtable.h
index 47b5ffc8715d..b3ac8948b257 100644
--- a/arch/powerpc/include/asm/book3s/64/pgtable.h
+++ b/arch/powerpc/include/asm/book3s/64/pgtable.h
@@ -319,9 +319,6 @@ extern unsigned long pci_io_base;
 /* Advertise special mapping type for AGP */
 #define HAVE_PAGE_AGP
 
-/* Advertise support for _PAGE_SPECIAL */
-#define __HAVE_ARCH_PTE_SPECIAL
-
 #ifndef __ASSEMBLY__
 
 /*
diff --git a/arch/powerpc/include/asm/pte-common.h b/arch/powerpc/include/asm/pte-common.h
index c4a72c7a8c83..03dfddb1f49a 100644
--- a/arch/powerpc/include/asm/pte-common.h
+++ b/arch/powerpc/include/asm/pte-common.h
@@ -216,9 +216,6 @@ static inline bool pte_user(pte_t pte)
 #define PAGE_AGP		(PAGE_KERNEL_NC)
 #define HAVE_PAGE_AGP
 
-/* Advertise support for _PAGE_SPECIAL */
-#define __HAVE_ARCH_PTE_SPECIAL
-
 #ifndef _PAGE_READ
 /* if not defined, we should not find _PAGE_WRITE too */
 #define _PAGE_READ 0
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index 5287c1441d66..b01c183836e5 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -34,6 +34,7 @@ config RISCV
 	select THREAD_INFO_IN_TASK
 	select RISCV_TIMER
 	select GENERIC_IRQ_MULTI_HANDLER
+	select ARCH_HAS_PTE_SPECIAL
 
 config MMU
 	def_bool y
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index 32a0d5b958bf..5f1f4997e7e9 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -72,6 +72,7 @@ config S390
 	select ARCH_HAS_GCOV_PROFILE_ALL
 	select ARCH_HAS_GIGANTIC_PAGE if (MEMORY_ISOLATION && COMPACTION) || CMA
 	select ARCH_HAS_KCOV
+	select ARCH_HAS_PTE_SPECIAL
 	select ARCH_HAS_SET_MEMORY
 	select ARCH_HAS_SG_CHAIN
 	select ARCH_HAS_STRICT_KERNEL_RWX
diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h
index 2d24d33bf188..9809694e1389 100644
--- a/arch/s390/include/asm/pgtable.h
+++ b/arch/s390/include/asm/pgtable.h
@@ -171,7 +171,6 @@ static inline int is_module_addr(void *addr)
 #define _PAGE_WRITE	0x020		/* SW pte write bit */
 #define _PAGE_SPECIAL	0x040		/* SW associated with special page */
 #define _PAGE_UNUSED	0x080		/* SW bit for pgste usage state */
-#define __HAVE_ARCH_PTE_SPECIAL
 
 #ifdef CONFIG_MEM_SOFT_DIRTY
 #define _PAGE_SOFT_DIRTY 0x002		/* SW pte soft dirty bit */
diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index 97fe29316476..a6c75b6806d2 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -50,6 +50,7 @@ config SUPERH
 	select HAVE_ARCH_AUDITSYSCALL
 	select HAVE_FUTEX_CMPXCHG if FUTEX
 	select HAVE_NMI
+	select ARCH_HAS_PTE_SPECIAL
 	help
 	  The SuperH is a RISC processor targeted for use in embedded systems
 	  and consumer electronics; it was also used in the Sega Dreamcast
diff --git a/arch/sh/include/asm/pgtable.h b/arch/sh/include/asm/pgtable.h
index 89c513a982fc..f6abfe2bca93 100644
--- a/arch/sh/include/asm/pgtable.h
+++ b/arch/sh/include/asm/pgtable.h
@@ -156,8 +156,6 @@ extern void page_table_range_init(unsigned long start, unsigned long end,
 #define HAVE_ARCH_UNMAPPED_AREA
 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
 
-#define __HAVE_ARCH_PTE_SPECIAL
-
 #include <asm-generic/pgtable.h>
 
 #endif /* __ASM_SH_PGTABLE_H */
diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
index 8767e45f1b2b..6b5a4f05dcb2 100644
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig
@@ -86,6 +86,7 @@ config SPARC64
 	select ARCH_USE_QUEUED_SPINLOCKS
 	select GENERIC_TIME_VSYSCALL
 	select ARCH_CLOCKSOURCE_DATA
+	select ARCH_HAS_PTE_SPECIAL
 
 config ARCH_DEFCONFIG
 	string
diff --git a/arch/sparc/include/asm/pgtable_64.h b/arch/sparc/include/asm/pgtable_64.h
index 44d6ac47e035..1393a8ac596b 100644
--- a/arch/sparc/include/asm/pgtable_64.h
+++ b/arch/sparc/include/asm/pgtable_64.h
@@ -117,9 +117,6 @@ bool kern_addr_valid(unsigned long addr);
 #define _PAGE_PMD_HUGE    _AC(0x0100000000000000,UL) /* Huge page            */
 #define _PAGE_PUD_HUGE    _PAGE_PMD_HUGE
 
-/* Advertise support for _PAGE_SPECIAL */
-#define __HAVE_ARCH_PTE_SPECIAL
-
 /* SUN4U pte bits... */
 #define _PAGE_SZ4MB_4U	  _AC(0x6000000000000000,UL) /* 4MB Page             */
 #define _PAGE_SZ512K_4U	  _AC(0x4000000000000000,UL) /* 512K Page            */
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index bf4ddea48e61..3f5fb25486bf 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -56,6 +56,7 @@ config X86
 	select ARCH_HAS_KCOV			if X86_64
 	select ARCH_HAS_MEMBARRIER_SYNC_CORE
 	select ARCH_HAS_PMEM_API		if X86_64
+	select ARCH_HAS_PTE_SPECIAL
 	select ARCH_HAS_REFCOUNT
 	select ARCH_HAS_UACCESS_FLUSHCACHE	if X86_64
 	select ARCH_HAS_SET_MEMORY
diff --git a/arch/x86/include/asm/pgtable_types.h b/arch/x86/include/asm/pgtable_types.h
index acfe755562a6..3e195728d7d1 100644
--- a/arch/x86/include/asm/pgtable_types.h
+++ b/arch/x86/include/asm/pgtable_types.h
@@ -65,7 +65,6 @@
 #define _PAGE_PKEY_BIT2	(_AT(pteval_t, 0))
 #define _PAGE_PKEY_BIT3	(_AT(pteval_t, 0))
 #endif
-#define __HAVE_ARCH_PTE_SPECIAL
 
 #define _PAGE_PKEY_MASK (_PAGE_PKEY_BIT0 | \
 			 _PAGE_PKEY_BIT1 | \
diff --git a/include/linux/pfn_t.h b/include/linux/pfn_t.h
index a03c2642a87c..21713dc14ce2 100644
--- a/include/linux/pfn_t.h
+++ b/include/linux/pfn_t.h
@@ -122,7 +122,7 @@ pud_t pud_mkdevmap(pud_t pud);
 #endif
 #endif /* __HAVE_ARCH_PTE_DEVMAP */
 
-#ifdef __HAVE_ARCH_PTE_SPECIAL
+#ifdef CONFIG_ARCH_HAS_PTE_SPECIAL
 static inline bool pfn_t_special(pfn_t pfn)
 {
 	return (pfn.val & PFN_SPECIAL) == PFN_SPECIAL;
@@ -132,5 +132,5 @@ static inline bool pfn_t_special(pfn_t pfn)
 {
 	return false;
 }
-#endif /* __HAVE_ARCH_PTE_SPECIAL */
+#endif /* CONFIG_ARCH_HAS_PTE_SPECIAL */
 #endif /* _LINUX_PFN_T_H_ */
diff --git a/mm/Kconfig b/mm/Kconfig
index d5004d82a1d6..1ea3e4a6a123 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -752,3 +752,6 @@ config GUP_BENCHMARK
 	  performance of get_user_pages_fast().
 
 	  See tools/testing/selftests/vm/gup_benchmark.c
+
+config ARCH_HAS_PTE_SPECIAL
+	bool
diff --git a/mm/gup.c b/mm/gup.c
index f296df6cf666..b044a3d14dc5 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -1351,7 +1351,7 @@ static void undo_dev_pagemap(int *nr, int nr_start, struct page **pages)
 	}
 }
 
-#ifdef __HAVE_ARCH_PTE_SPECIAL
+#ifdef CONFIG_ARCH_HAS_PTE_SPECIAL
 static int gup_pte_range(pmd_t pmd, unsigned long addr, unsigned long end,
 			 int write, struct page **pages, int *nr)
 {
@@ -1427,7 +1427,7 @@ static int gup_pte_range(pmd_t pmd, unsigned long addr, unsigned long end,
 {
 	return 0;
 }
-#endif /* __HAVE_ARCH_PTE_SPECIAL */
+#endif /* CONFIG_ARCH_HAS_PTE_SPECIAL */
 
 #if defined(__HAVE_ARCH_PTE_DEVMAP) && defined(CONFIG_TRANSPARENT_HUGEPAGE)
 static int __gup_device_huge(unsigned long pfn, unsigned long addr,
diff --git a/mm/memory.c b/mm/memory.c
index a1f990e33e38..96910c625daa 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -817,7 +817,7 @@ static void print_bad_pte(struct vm_area_struct *vma, unsigned long addr,
  * PFNMAP mappings in order to support COWable mappings.
  *
  */
-#ifdef __HAVE_ARCH_PTE_SPECIAL
+#ifdef CONFIG_ARCH_HAS_PTE_SPECIAL
 # define HAVE_PTE_SPECIAL 1
 #else
 # define HAVE_PTE_SPECIAL 0
-- 
2.7.4

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^ permalink raw reply related	[flat|nested] 55+ messages in thread
* [PATCH v2 1/2] mm: introduce ARCH_HAS_PTE_SPECIAL
@ 2018-04-10 15:25   ` Laurent Dufour
  0 siblings, 0 replies; 55+ messages in thread
From: Laurent Dufour @ 2018-04-10 15:25 UTC (permalink / raw)
  To: linux-riscv

Currently the PTE special supports is turned on in per architecture header
files. Most of the time, it is defined in arch/*/include/asm/pgtable.h
depending or not on some other per architecture static definition.

This patch introduce a new configuration variable to manage this directly
in the Kconfig files. It would later replace __HAVE_ARCH_PTE_SPECIAL.

Here notes for some architecture where the definition of
__HAVE_ARCH_PTE_SPECIAL is not obvious:

arm
 __HAVE_ARCH_PTE_SPECIAL which is currently defined in
arch/arm/include/asm/pgtable-3level.h which is included by
arch/arm/include/asm/pgtable.h when CONFIG_ARM_LPAE is set.
So select ARCH_HAS_PTE_SPECIAL if ARM_LPAE.

powerpc
__HAVE_ARCH_PTE_SPECIAL is defined in 2 files:
 - arch/powerpc/include/asm/book3s/64/pgtable.h
 - arch/powerpc/include/asm/pte-common.h
The first one is included if (PPC_BOOK3S & PPC64) while the second is
included in all the other cases.
So select ARCH_HAS_PTE_SPECIAL all the time.

sparc:
__HAVE_ARCH_PTE_SPECIAL is defined if defined(__sparc__) &&
defined(__arch64__) which are defined through the compiler in
sparc/Makefile if !SPARC32 which I assume to be if SPARC64.
So select ARCH_HAS_PTE_SPECIAL if SPARC64

There is no functional change introduced by this patch.

Suggested-by: Jerome Glisse <jglisse@redhat>
Reviewed-by: Jerome Glisse <jglisse@redhat>
Signed-off-by: Laurent Dufour <ldufour@linux.vnet.ibm.com>
---
 Documentation/features/vm/pte_special/arch-support.txt | 2 +-
 arch/arc/Kconfig                                       | 1 +
 arch/arc/include/asm/pgtable.h                         | 2 --
 arch/arm/Kconfig                                       | 1 +
 arch/arm/include/asm/pgtable-3level.h                  | 1 -
 arch/arm64/Kconfig                                     | 1 +
 arch/arm64/include/asm/pgtable.h                       | 2 --
 arch/powerpc/Kconfig                                   | 1 +
 arch/powerpc/include/asm/book3s/64/pgtable.h           | 3 ---
 arch/powerpc/include/asm/pte-common.h                  | 3 ---
 arch/riscv/Kconfig                                     | 1 +
 arch/s390/Kconfig                                      | 1 +
 arch/s390/include/asm/pgtable.h                        | 1 -
 arch/sh/Kconfig                                        | 1 +
 arch/sh/include/asm/pgtable.h                          | 2 --
 arch/sparc/Kconfig                                     | 1 +
 arch/sparc/include/asm/pgtable_64.h                    | 3 ---
 arch/x86/Kconfig                                       | 1 +
 arch/x86/include/asm/pgtable_types.h                   | 1 -
 include/linux/pfn_t.h                                  | 4 ++--
 mm/Kconfig                                             | 3 +++
 mm/gup.c                                               | 4 ++--
 mm/memory.c                                            | 2 +-
 23 files changed, 18 insertions(+), 24 deletions(-)

diff --git a/Documentation/features/vm/pte_special/arch-support.txt b/Documentation/features/vm/pte_special/arch-support.txt
index 055004f467d2..cd05924ea875 100644
--- a/Documentation/features/vm/pte_special/arch-support.txt
+++ b/Documentation/features/vm/pte_special/arch-support.txt
@@ -1,6 +1,6 @@
 #
 # Feature name:          pte_special
-#         Kconfig:       __HAVE_ARCH_PTE_SPECIAL
+#         Kconfig:       ARCH_HAS_PTE_SPECIAL
 #         description:   arch supports the pte_special()/pte_mkspecial() VM APIs
 #
     -----------------------
diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig
index d76bf4a83740..8516e2b0239a 100644
--- a/arch/arc/Kconfig
+++ b/arch/arc/Kconfig
@@ -44,6 +44,7 @@ config ARC
 	select HAVE_GENERIC_DMA_COHERENT
 	select HAVE_KERNEL_GZIP
 	select HAVE_KERNEL_LZMA
+	select ARCH_HAS_PTE_SPECIAL
 
 config MIGHT_HAVE_PCI
 	bool
diff --git a/arch/arc/include/asm/pgtable.h b/arch/arc/include/asm/pgtable.h
index 08fe33830d4b..8ec5599a0957 100644
--- a/arch/arc/include/asm/pgtable.h
+++ b/arch/arc/include/asm/pgtable.h
@@ -320,8 +320,6 @@ PTE_BIT_FUNC(mkexec,	|= (_PAGE_EXECUTE));
 PTE_BIT_FUNC(mkspecial,	|= (_PAGE_SPECIAL));
 PTE_BIT_FUNC(mkhuge,	|= (_PAGE_HW_SZ));
 
-#define __HAVE_ARCH_PTE_SPECIAL
-
 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 {
 	return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot));
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index a7f8e7f4b88f..c088c851b235 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -8,6 +8,7 @@ config ARM
 	select ARCH_HAS_DEVMEM_IS_ALLOWED
 	select ARCH_HAS_ELF_RANDOMIZE
 	select ARCH_HAS_FORTIFY_SOURCE
+	select ARCH_HAS_PTE_SPECIAL if ARM_LPAE
 	select ARCH_HAS_SET_MEMORY
 	select ARCH_HAS_PHYS_TO_DMA
 	select ARCH_HAS_STRICT_KERNEL_RWX if MMU && !XIP_KERNEL
diff --git a/arch/arm/include/asm/pgtable-3level.h b/arch/arm/include/asm/pgtable-3level.h
index 2a4836087358..6d50a11d7793 100644
--- a/arch/arm/include/asm/pgtable-3level.h
+++ b/arch/arm/include/asm/pgtable-3level.h
@@ -219,7 +219,6 @@ static inline pte_t pte_mkspecial(pte_t pte)
 	pte_val(pte) |= L_PTE_SPECIAL;
 	return pte;
 }
-#define	__HAVE_ARCH_PTE_SPECIAL
 
 #define pmd_write(pmd)		(pmd_isclear((pmd), L_PMD_SECT_RDONLY))
 #define pmd_dirty(pmd)		(pmd_isset((pmd), L_PMD_SECT_DIRTY))
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index eb2cf4938f6d..9a3f1b1ab50c 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -17,6 +17,7 @@ config ARM64
 	select ARCH_HAS_GIGANTIC_PAGE if (MEMORY_ISOLATION && COMPACTION) || CMA
 	select ARCH_HAS_KCOV
 	select ARCH_HAS_MEMBARRIER_SYNC_CORE
+	select ARCH_HAS_PTE_SPECIAL
 	select ARCH_HAS_SET_MEMORY
 	select ARCH_HAS_SG_CHAIN
 	select ARCH_HAS_STRICT_KERNEL_RWX
diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
index 7e2c27e63cd8..b96c8a186908 100644
--- a/arch/arm64/include/asm/pgtable.h
+++ b/arch/arm64/include/asm/pgtable.h
@@ -306,8 +306,6 @@ static inline int pte_same(pte_t pte_a, pte_t pte_b)
 #define HPAGE_MASK		(~(HPAGE_SIZE - 1))
 #define HUGETLB_PAGE_ORDER	(HPAGE_SHIFT - PAGE_SHIFT)
 
-#define __HAVE_ARCH_PTE_SPECIAL
-
 static inline pte_t pgd_pte(pgd_t pgd)
 {
 	return __pte(pgd_val(pgd));
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index c32a181a7cbb..f7415fe25c07 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -141,6 +141,7 @@ config PPC
 	select ARCH_HAS_GCOV_PROFILE_ALL
 	select ARCH_HAS_PHYS_TO_DMA
 	select ARCH_HAS_PMEM_API                if PPC64
+	select ARCH_HAS_PTE_SPECIAL
 	select ARCH_HAS_MEMBARRIER_CALLBACKS
 	select ARCH_HAS_SCALED_CPUTIME		if VIRT_CPU_ACCOUNTING_NATIVE
 	select ARCH_HAS_SG_CHAIN
diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h b/arch/powerpc/include/asm/book3s/64/pgtable.h
index 47b5ffc8715d..b3ac8948b257 100644
--- a/arch/powerpc/include/asm/book3s/64/pgtable.h
+++ b/arch/powerpc/include/asm/book3s/64/pgtable.h
@@ -319,9 +319,6 @@ extern unsigned long pci_io_base;
 /* Advertise special mapping type for AGP */
 #define HAVE_PAGE_AGP
 
-/* Advertise support for _PAGE_SPECIAL */
-#define __HAVE_ARCH_PTE_SPECIAL
-
 #ifndef __ASSEMBLY__
 
 /*
diff --git a/arch/powerpc/include/asm/pte-common.h b/arch/powerpc/include/asm/pte-common.h
index c4a72c7a8c83..03dfddb1f49a 100644
--- a/arch/powerpc/include/asm/pte-common.h
+++ b/arch/powerpc/include/asm/pte-common.h
@@ -216,9 +216,6 @@ static inline bool pte_user(pte_t pte)
 #define PAGE_AGP		(PAGE_KERNEL_NC)
 #define HAVE_PAGE_AGP
 
-/* Advertise support for _PAGE_SPECIAL */
-#define __HAVE_ARCH_PTE_SPECIAL
-
 #ifndef _PAGE_READ
 /* if not defined, we should not find _PAGE_WRITE too */
 #define _PAGE_READ 0
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index 5287c1441d66..b01c183836e5 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -34,6 +34,7 @@ config RISCV
 	select THREAD_INFO_IN_TASK
 	select RISCV_TIMER
 	select GENERIC_IRQ_MULTI_HANDLER
+	select ARCH_HAS_PTE_SPECIAL
 
 config MMU
 	def_bool y
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index 32a0d5b958bf..5f1f4997e7e9 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -72,6 +72,7 @@ config S390
 	select ARCH_HAS_GCOV_PROFILE_ALL
 	select ARCH_HAS_GIGANTIC_PAGE if (MEMORY_ISOLATION && COMPACTION) || CMA
 	select ARCH_HAS_KCOV
+	select ARCH_HAS_PTE_SPECIAL
 	select ARCH_HAS_SET_MEMORY
 	select ARCH_HAS_SG_CHAIN
 	select ARCH_HAS_STRICT_KERNEL_RWX
diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h
index 2d24d33bf188..9809694e1389 100644
--- a/arch/s390/include/asm/pgtable.h
+++ b/arch/s390/include/asm/pgtable.h
@@ -171,7 +171,6 @@ static inline int is_module_addr(void *addr)
 #define _PAGE_WRITE	0x020		/* SW pte write bit */
 #define _PAGE_SPECIAL	0x040		/* SW associated with special page */
 #define _PAGE_UNUSED	0x080		/* SW bit for pgste usage state */
-#define __HAVE_ARCH_PTE_SPECIAL
 
 #ifdef CONFIG_MEM_SOFT_DIRTY
 #define _PAGE_SOFT_DIRTY 0x002		/* SW pte soft dirty bit */
diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index 97fe29316476..a6c75b6806d2 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -50,6 +50,7 @@ config SUPERH
 	select HAVE_ARCH_AUDITSYSCALL
 	select HAVE_FUTEX_CMPXCHG if FUTEX
 	select HAVE_NMI
+	select ARCH_HAS_PTE_SPECIAL
 	help
 	  The SuperH is a RISC processor targeted for use in embedded systems
 	  and consumer electronics; it was also used in the Sega Dreamcast
diff --git a/arch/sh/include/asm/pgtable.h b/arch/sh/include/asm/pgtable.h
index 89c513a982fc..f6abfe2bca93 100644
--- a/arch/sh/include/asm/pgtable.h
+++ b/arch/sh/include/asm/pgtable.h
@@ -156,8 +156,6 @@ extern void page_table_range_init(unsigned long start, unsigned long end,
 #define HAVE_ARCH_UNMAPPED_AREA
 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
 
-#define __HAVE_ARCH_PTE_SPECIAL
-
 #include <asm-generic/pgtable.h>
 
 #endif /* __ASM_SH_PGTABLE_H */
diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
index 8767e45f1b2b..6b5a4f05dcb2 100644
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig
@@ -86,6 +86,7 @@ config SPARC64
 	select ARCH_USE_QUEUED_SPINLOCKS
 	select GENERIC_TIME_VSYSCALL
 	select ARCH_CLOCKSOURCE_DATA
+	select ARCH_HAS_PTE_SPECIAL
 
 config ARCH_DEFCONFIG
 	string
diff --git a/arch/sparc/include/asm/pgtable_64.h b/arch/sparc/include/asm/pgtable_64.h
index 44d6ac47e035..1393a8ac596b 100644
--- a/arch/sparc/include/asm/pgtable_64.h
+++ b/arch/sparc/include/asm/pgtable_64.h
@@ -117,9 +117,6 @@ bool kern_addr_valid(unsigned long addr);
 #define _PAGE_PMD_HUGE    _AC(0x0100000000000000,UL) /* Huge page            */
 #define _PAGE_PUD_HUGE    _PAGE_PMD_HUGE
 
-/* Advertise support for _PAGE_SPECIAL */
-#define __HAVE_ARCH_PTE_SPECIAL
-
 /* SUN4U pte bits... */
 #define _PAGE_SZ4MB_4U	  _AC(0x6000000000000000,UL) /* 4MB Page             */
 #define _PAGE_SZ512K_4U	  _AC(0x4000000000000000,UL) /* 512K Page            */
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index bf4ddea48e61..3f5fb25486bf 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -56,6 +56,7 @@ config X86
 	select ARCH_HAS_KCOV			if X86_64
 	select ARCH_HAS_MEMBARRIER_SYNC_CORE
 	select ARCH_HAS_PMEM_API		if X86_64
+	select ARCH_HAS_PTE_SPECIAL
 	select ARCH_HAS_REFCOUNT
 	select ARCH_HAS_UACCESS_FLUSHCACHE	if X86_64
 	select ARCH_HAS_SET_MEMORY
diff --git a/arch/x86/include/asm/pgtable_types.h b/arch/x86/include/asm/pgtable_types.h
index acfe755562a6..3e195728d7d1 100644
--- a/arch/x86/include/asm/pgtable_types.h
+++ b/arch/x86/include/asm/pgtable_types.h
@@ -65,7 +65,6 @@
 #define _PAGE_PKEY_BIT2	(_AT(pteval_t, 0))
 #define _PAGE_PKEY_BIT3	(_AT(pteval_t, 0))
 #endif
-#define __HAVE_ARCH_PTE_SPECIAL
 
 #define _PAGE_PKEY_MASK (_PAGE_PKEY_BIT0 | \
 			 _PAGE_PKEY_BIT1 | \
diff --git a/include/linux/pfn_t.h b/include/linux/pfn_t.h
index a03c2642a87c..21713dc14ce2 100644
--- a/include/linux/pfn_t.h
+++ b/include/linux/pfn_t.h
@@ -122,7 +122,7 @@ pud_t pud_mkdevmap(pud_t pud);
 #endif
 #endif /* __HAVE_ARCH_PTE_DEVMAP */
 
-#ifdef __HAVE_ARCH_PTE_SPECIAL
+#ifdef CONFIG_ARCH_HAS_PTE_SPECIAL
 static inline bool pfn_t_special(pfn_t pfn)
 {
 	return (pfn.val & PFN_SPECIAL) == PFN_SPECIAL;
@@ -132,5 +132,5 @@ static inline bool pfn_t_special(pfn_t pfn)
 {
 	return false;
 }
-#endif /* __HAVE_ARCH_PTE_SPECIAL */
+#endif /* CONFIG_ARCH_HAS_PTE_SPECIAL */
 #endif /* _LINUX_PFN_T_H_ */
diff --git a/mm/Kconfig b/mm/Kconfig
index d5004d82a1d6..1ea3e4a6a123 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -752,3 +752,6 @@ config GUP_BENCHMARK
 	  performance of get_user_pages_fast().
 
 	  See tools/testing/selftests/vm/gup_benchmark.c
+
+config ARCH_HAS_PTE_SPECIAL
+	bool
diff --git a/mm/gup.c b/mm/gup.c
index f296df6cf666..b044a3d14dc5 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -1351,7 +1351,7 @@ static void undo_dev_pagemap(int *nr, int nr_start, struct page **pages)
 	}
 }
 
-#ifdef __HAVE_ARCH_PTE_SPECIAL
+#ifdef CONFIG_ARCH_HAS_PTE_SPECIAL
 static int gup_pte_range(pmd_t pmd, unsigned long addr, unsigned long end,
 			 int write, struct page **pages, int *nr)
 {
@@ -1427,7 +1427,7 @@ static int gup_pte_range(pmd_t pmd, unsigned long addr, unsigned long end,
 {
 	return 0;
 }
-#endif /* __HAVE_ARCH_PTE_SPECIAL */
+#endif /* CONFIG_ARCH_HAS_PTE_SPECIAL */
 
 #if defined(__HAVE_ARCH_PTE_DEVMAP) && defined(CONFIG_TRANSPARENT_HUGEPAGE)
 static int __gup_device_huge(unsigned long pfn, unsigned long addr,
diff --git a/mm/memory.c b/mm/memory.c
index a1f990e33e38..96910c625daa 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -817,7 +817,7 @@ static void print_bad_pte(struct vm_area_struct *vma, unsigned long addr,
  * PFNMAP mappings in order to support COWable mappings.
  *
  */
-#ifdef __HAVE_ARCH_PTE_SPECIAL
+#ifdef CONFIG_ARCH_HAS_PTE_SPECIAL
 # define HAVE_PTE_SPECIAL 1
 #else
 # define HAVE_PTE_SPECIAL 0
-- 
2.7.4

^ permalink raw reply related	[flat|nested] 55+ messages in thread
* [PATCH v2 1/2] mm: introduce ARCH_HAS_PTE_SPECIAL
@ 2018-04-10 15:25   ` Laurent Dufour
  0 siblings, 0 replies; 55+ messages in thread
From: Laurent Dufour @ 2018-04-10 15:25 UTC (permalink / raw)
  To: linux-snps-arc

Currently the PTE special supports is turned on in per architecture header
files. Most of the time, it is defined in arch/*/include/asm/pgtable.h
depending or not on some other per architecture static definition.

This patch introduce a new configuration variable to manage this directly
in the Kconfig files. It would later replace __HAVE_ARCH_PTE_SPECIAL.

Here notes for some architecture where the definition of
__HAVE_ARCH_PTE_SPECIAL is not obvious:

arm
 __HAVE_ARCH_PTE_SPECIAL which is currently defined in
arch/arm/include/asm/pgtable-3level.h which is included by
arch/arm/include/asm/pgtable.h when CONFIG_ARM_LPAE is set.
So select ARCH_HAS_PTE_SPECIAL if ARM_LPAE.

powerpc
__HAVE_ARCH_PTE_SPECIAL is defined in 2 files:
 - arch/powerpc/include/asm/book3s/64/pgtable.h
 - arch/powerpc/include/asm/pte-common.h
The first one is included if (PPC_BOOK3S & PPC64) while the second is
included in all the other cases.
So select ARCH_HAS_PTE_SPECIAL all the time.

sparc:
__HAVE_ARCH_PTE_SPECIAL is defined if defined(__sparc__) &&
defined(__arch64__) which are defined through the compiler in
sparc/Makefile if !SPARC32 which I assume to be if SPARC64.
So select ARCH_HAS_PTE_SPECIAL if SPARC64

There is no functional change introduced by this patch.

Suggested-by: Jerome Glisse <jglisse at redhat>
Reviewed-by: Jerome Glisse <jglisse at redhat>
Signed-off-by: Laurent Dufour <ldufour at linux.vnet.ibm.com>
---
 Documentation/features/vm/pte_special/arch-support.txt | 2 +-
 arch/arc/Kconfig                                       | 1 +
 arch/arc/include/asm/pgtable.h                         | 2 --
 arch/arm/Kconfig                                       | 1 +
 arch/arm/include/asm/pgtable-3level.h                  | 1 -
 arch/arm64/Kconfig                                     | 1 +
 arch/arm64/include/asm/pgtable.h                       | 2 --
 arch/powerpc/Kconfig                                   | 1 +
 arch/powerpc/include/asm/book3s/64/pgtable.h           | 3 ---
 arch/powerpc/include/asm/pte-common.h                  | 3 ---
 arch/riscv/Kconfig                                     | 1 +
 arch/s390/Kconfig                                      | 1 +
 arch/s390/include/asm/pgtable.h                        | 1 -
 arch/sh/Kconfig                                        | 1 +
 arch/sh/include/asm/pgtable.h                          | 2 --
 arch/sparc/Kconfig                                     | 1 +
 arch/sparc/include/asm/pgtable_64.h                    | 3 ---
 arch/x86/Kconfig                                       | 1 +
 arch/x86/include/asm/pgtable_types.h                   | 1 -
 include/linux/pfn_t.h                                  | 4 ++--
 mm/Kconfig                                             | 3 +++
 mm/gup.c                                               | 4 ++--
 mm/memory.c                                            | 2 +-
 23 files changed, 18 insertions(+), 24 deletions(-)

diff --git a/Documentation/features/vm/pte_special/arch-support.txt b/Documentation/features/vm/pte_special/arch-support.txt
index 055004f467d2..cd05924ea875 100644
--- a/Documentation/features/vm/pte_special/arch-support.txt
+++ b/Documentation/features/vm/pte_special/arch-support.txt
@@ -1,6 +1,6 @@
 #
 # Feature name:          pte_special
-#         Kconfig:       __HAVE_ARCH_PTE_SPECIAL
+#         Kconfig:       ARCH_HAS_PTE_SPECIAL
 #         description:   arch supports the pte_special()/pte_mkspecial() VM APIs
 #
     -----------------------
diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig
index d76bf4a83740..8516e2b0239a 100644
--- a/arch/arc/Kconfig
+++ b/arch/arc/Kconfig
@@ -44,6 +44,7 @@ config ARC
 	select HAVE_GENERIC_DMA_COHERENT
 	select HAVE_KERNEL_GZIP
 	select HAVE_KERNEL_LZMA
+	select ARCH_HAS_PTE_SPECIAL
 
 config MIGHT_HAVE_PCI
 	bool
diff --git a/arch/arc/include/asm/pgtable.h b/arch/arc/include/asm/pgtable.h
index 08fe33830d4b..8ec5599a0957 100644
--- a/arch/arc/include/asm/pgtable.h
+++ b/arch/arc/include/asm/pgtable.h
@@ -320,8 +320,6 @@ PTE_BIT_FUNC(mkexec,	|= (_PAGE_EXECUTE));
 PTE_BIT_FUNC(mkspecial,	|= (_PAGE_SPECIAL));
 PTE_BIT_FUNC(mkhuge,	|= (_PAGE_HW_SZ));
 
-#define __HAVE_ARCH_PTE_SPECIAL
-
 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 {
 	return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot));
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index a7f8e7f4b88f..c088c851b235 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -8,6 +8,7 @@ config ARM
 	select ARCH_HAS_DEVMEM_IS_ALLOWED
 	select ARCH_HAS_ELF_RANDOMIZE
 	select ARCH_HAS_FORTIFY_SOURCE
+	select ARCH_HAS_PTE_SPECIAL if ARM_LPAE
 	select ARCH_HAS_SET_MEMORY
 	select ARCH_HAS_PHYS_TO_DMA
 	select ARCH_HAS_STRICT_KERNEL_RWX if MMU && !XIP_KERNEL
diff --git a/arch/arm/include/asm/pgtable-3level.h b/arch/arm/include/asm/pgtable-3level.h
index 2a4836087358..6d50a11d7793 100644
--- a/arch/arm/include/asm/pgtable-3level.h
+++ b/arch/arm/include/asm/pgtable-3level.h
@@ -219,7 +219,6 @@ static inline pte_t pte_mkspecial(pte_t pte)
 	pte_val(pte) |= L_PTE_SPECIAL;
 	return pte;
 }
-#define	__HAVE_ARCH_PTE_SPECIAL
 
 #define pmd_write(pmd)		(pmd_isclear((pmd), L_PMD_SECT_RDONLY))
 #define pmd_dirty(pmd)		(pmd_isset((pmd), L_PMD_SECT_DIRTY))
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index eb2cf4938f6d..9a3f1b1ab50c 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -17,6 +17,7 @@ config ARM64
 	select ARCH_HAS_GIGANTIC_PAGE if (MEMORY_ISOLATION && COMPACTION) || CMA
 	select ARCH_HAS_KCOV
 	select ARCH_HAS_MEMBARRIER_SYNC_CORE
+	select ARCH_HAS_PTE_SPECIAL
 	select ARCH_HAS_SET_MEMORY
 	select ARCH_HAS_SG_CHAIN
 	select ARCH_HAS_STRICT_KERNEL_RWX
diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
index 7e2c27e63cd8..b96c8a186908 100644
--- a/arch/arm64/include/asm/pgtable.h
+++ b/arch/arm64/include/asm/pgtable.h
@@ -306,8 +306,6 @@ static inline int pte_same(pte_t pte_a, pte_t pte_b)
 #define HPAGE_MASK		(~(HPAGE_SIZE - 1))
 #define HUGETLB_PAGE_ORDER	(HPAGE_SHIFT - PAGE_SHIFT)
 
-#define __HAVE_ARCH_PTE_SPECIAL
-
 static inline pte_t pgd_pte(pgd_t pgd)
 {
 	return __pte(pgd_val(pgd));
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index c32a181a7cbb..f7415fe25c07 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -141,6 +141,7 @@ config PPC
 	select ARCH_HAS_GCOV_PROFILE_ALL
 	select ARCH_HAS_PHYS_TO_DMA
 	select ARCH_HAS_PMEM_API                if PPC64
+	select ARCH_HAS_PTE_SPECIAL
 	select ARCH_HAS_MEMBARRIER_CALLBACKS
 	select ARCH_HAS_SCALED_CPUTIME		if VIRT_CPU_ACCOUNTING_NATIVE
 	select ARCH_HAS_SG_CHAIN
diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h b/arch/powerpc/include/asm/book3s/64/pgtable.h
index 47b5ffc8715d..b3ac8948b257 100644
--- a/arch/powerpc/include/asm/book3s/64/pgtable.h
+++ b/arch/powerpc/include/asm/book3s/64/pgtable.h
@@ -319,9 +319,6 @@ extern unsigned long pci_io_base;
 /* Advertise special mapping type for AGP */
 #define HAVE_PAGE_AGP
 
-/* Advertise support for _PAGE_SPECIAL */
-#define __HAVE_ARCH_PTE_SPECIAL
-
 #ifndef __ASSEMBLY__
 
 /*
diff --git a/arch/powerpc/include/asm/pte-common.h b/arch/powerpc/include/asm/pte-common.h
index c4a72c7a8c83..03dfddb1f49a 100644
--- a/arch/powerpc/include/asm/pte-common.h
+++ b/arch/powerpc/include/asm/pte-common.h
@@ -216,9 +216,6 @@ static inline bool pte_user(pte_t pte)
 #define PAGE_AGP		(PAGE_KERNEL_NC)
 #define HAVE_PAGE_AGP
 
-/* Advertise support for _PAGE_SPECIAL */
-#define __HAVE_ARCH_PTE_SPECIAL
-
 #ifndef _PAGE_READ
 /* if not defined, we should not find _PAGE_WRITE too */
 #define _PAGE_READ 0
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index 5287c1441d66..b01c183836e5 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -34,6 +34,7 @@ config RISCV
 	select THREAD_INFO_IN_TASK
 	select RISCV_TIMER
 	select GENERIC_IRQ_MULTI_HANDLER
+	select ARCH_HAS_PTE_SPECIAL
 
 config MMU
 	def_bool y
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index 32a0d5b958bf..5f1f4997e7e9 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -72,6 +72,7 @@ config S390
 	select ARCH_HAS_GCOV_PROFILE_ALL
 	select ARCH_HAS_GIGANTIC_PAGE if (MEMORY_ISOLATION && COMPACTION) || CMA
 	select ARCH_HAS_KCOV
+	select ARCH_HAS_PTE_SPECIAL
 	select ARCH_HAS_SET_MEMORY
 	select ARCH_HAS_SG_CHAIN
 	select ARCH_HAS_STRICT_KERNEL_RWX
diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h
index 2d24d33bf188..9809694e1389 100644
--- a/arch/s390/include/asm/pgtable.h
+++ b/arch/s390/include/asm/pgtable.h
@@ -171,7 +171,6 @@ static inline int is_module_addr(void *addr)
 #define _PAGE_WRITE	0x020		/* SW pte write bit */
 #define _PAGE_SPECIAL	0x040		/* SW associated with special page */
 #define _PAGE_UNUSED	0x080		/* SW bit for pgste usage state */
-#define __HAVE_ARCH_PTE_SPECIAL
 
 #ifdef CONFIG_MEM_SOFT_DIRTY
 #define _PAGE_SOFT_DIRTY 0x002		/* SW pte soft dirty bit */
diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index 97fe29316476..a6c75b6806d2 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -50,6 +50,7 @@ config SUPERH
 	select HAVE_ARCH_AUDITSYSCALL
 	select HAVE_FUTEX_CMPXCHG if FUTEX
 	select HAVE_NMI
+	select ARCH_HAS_PTE_SPECIAL
 	help
 	  The SuperH is a RISC processor targeted for use in embedded systems
 	  and consumer electronics; it was also used in the Sega Dreamcast
diff --git a/arch/sh/include/asm/pgtable.h b/arch/sh/include/asm/pgtable.h
index 89c513a982fc..f6abfe2bca93 100644
--- a/arch/sh/include/asm/pgtable.h
+++ b/arch/sh/include/asm/pgtable.h
@@ -156,8 +156,6 @@ extern void page_table_range_init(unsigned long start, unsigned long end,
 #define HAVE_ARCH_UNMAPPED_AREA
 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
 
-#define __HAVE_ARCH_PTE_SPECIAL
-
 #include <asm-generic/pgtable.h>
 
 #endif /* __ASM_SH_PGTABLE_H */
diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
index 8767e45f1b2b..6b5a4f05dcb2 100644
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig
@@ -86,6 +86,7 @@ config SPARC64
 	select ARCH_USE_QUEUED_SPINLOCKS
 	select GENERIC_TIME_VSYSCALL
 	select ARCH_CLOCKSOURCE_DATA
+	select ARCH_HAS_PTE_SPECIAL
 
 config ARCH_DEFCONFIG
 	string
diff --git a/arch/sparc/include/asm/pgtable_64.h b/arch/sparc/include/asm/pgtable_64.h
index 44d6ac47e035..1393a8ac596b 100644
--- a/arch/sparc/include/asm/pgtable_64.h
+++ b/arch/sparc/include/asm/pgtable_64.h
@@ -117,9 +117,6 @@ bool kern_addr_valid(unsigned long addr);
 #define _PAGE_PMD_HUGE    _AC(0x0100000000000000,UL) /* Huge page            */
 #define _PAGE_PUD_HUGE    _PAGE_PMD_HUGE
 
-/* Advertise support for _PAGE_SPECIAL */
-#define __HAVE_ARCH_PTE_SPECIAL
-
 /* SUN4U pte bits... */
 #define _PAGE_SZ4MB_4U	  _AC(0x6000000000000000,UL) /* 4MB Page             */
 #define _PAGE_SZ512K_4U	  _AC(0x4000000000000000,UL) /* 512K Page            */
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index bf4ddea48e61..3f5fb25486bf 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -56,6 +56,7 @@ config X86
 	select ARCH_HAS_KCOV			if X86_64
 	select ARCH_HAS_MEMBARRIER_SYNC_CORE
 	select ARCH_HAS_PMEM_API		if X86_64
+	select ARCH_HAS_PTE_SPECIAL
 	select ARCH_HAS_REFCOUNT
 	select ARCH_HAS_UACCESS_FLUSHCACHE	if X86_64
 	select ARCH_HAS_SET_MEMORY
diff --git a/arch/x86/include/asm/pgtable_types.h b/arch/x86/include/asm/pgtable_types.h
index acfe755562a6..3e195728d7d1 100644
--- a/arch/x86/include/asm/pgtable_types.h
+++ b/arch/x86/include/asm/pgtable_types.h
@@ -65,7 +65,6 @@
 #define _PAGE_PKEY_BIT2	(_AT(pteval_t, 0))
 #define _PAGE_PKEY_BIT3	(_AT(pteval_t, 0))
 #endif
-#define __HAVE_ARCH_PTE_SPECIAL
 
 #define _PAGE_PKEY_MASK (_PAGE_PKEY_BIT0 | \
 			 _PAGE_PKEY_BIT1 | \
diff --git a/include/linux/pfn_t.h b/include/linux/pfn_t.h
index a03c2642a87c..21713dc14ce2 100644
--- a/include/linux/pfn_t.h
+++ b/include/linux/pfn_t.h
@@ -122,7 +122,7 @@ pud_t pud_mkdevmap(pud_t pud);
 #endif
 #endif /* __HAVE_ARCH_PTE_DEVMAP */
 
-#ifdef __HAVE_ARCH_PTE_SPECIAL
+#ifdef CONFIG_ARCH_HAS_PTE_SPECIAL
 static inline bool pfn_t_special(pfn_t pfn)
 {
 	return (pfn.val & PFN_SPECIAL) == PFN_SPECIAL;
@@ -132,5 +132,5 @@ static inline bool pfn_t_special(pfn_t pfn)
 {
 	return false;
 }
-#endif /* __HAVE_ARCH_PTE_SPECIAL */
+#endif /* CONFIG_ARCH_HAS_PTE_SPECIAL */
 #endif /* _LINUX_PFN_T_H_ */
diff --git a/mm/Kconfig b/mm/Kconfig
index d5004d82a1d6..1ea3e4a6a123 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -752,3 +752,6 @@ config GUP_BENCHMARK
 	  performance of get_user_pages_fast().
 
 	  See tools/testing/selftests/vm/gup_benchmark.c
+
+config ARCH_HAS_PTE_SPECIAL
+	bool
diff --git a/mm/gup.c b/mm/gup.c
index f296df6cf666..b044a3d14dc5 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -1351,7 +1351,7 @@ static void undo_dev_pagemap(int *nr, int nr_start, struct page **pages)
 	}
 }
 
-#ifdef __HAVE_ARCH_PTE_SPECIAL
+#ifdef CONFIG_ARCH_HAS_PTE_SPECIAL
 static int gup_pte_range(pmd_t pmd, unsigned long addr, unsigned long end,
 			 int write, struct page **pages, int *nr)
 {
@@ -1427,7 +1427,7 @@ static int gup_pte_range(pmd_t pmd, unsigned long addr, unsigned long end,
 {
 	return 0;
 }
-#endif /* __HAVE_ARCH_PTE_SPECIAL */
+#endif /* CONFIG_ARCH_HAS_PTE_SPECIAL */
 
 #if defined(__HAVE_ARCH_PTE_DEVMAP) && defined(CONFIG_TRANSPARENT_HUGEPAGE)
 static int __gup_device_huge(unsigned long pfn, unsigned long addr,
diff --git a/mm/memory.c b/mm/memory.c
index a1f990e33e38..96910c625daa 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -817,7 +817,7 @@ static void print_bad_pte(struct vm_area_struct *vma, unsigned long addr,
  * PFNMAP mappings in order to support COWable mappings.
  *
  */
-#ifdef __HAVE_ARCH_PTE_SPECIAL
+#ifdef CONFIG_ARCH_HAS_PTE_SPECIAL
 # define HAVE_PTE_SPECIAL 1
 #else
 # define HAVE_PTE_SPECIAL 0
-- 
2.7.4

^ permalink raw reply related	[flat|nested] 55+ messages in thread
* [PATCH v2 1/2] mm: introduce ARCH_HAS_PTE_SPECIAL
@ 2018-04-10 15:25   ` Laurent Dufour
  0 siblings, 0 replies; 55+ messages in thread
From: Laurent Dufour @ 2018-04-10 15:25 UTC (permalink / raw)
  To: linux-arm-kernel

Currently the PTE special supports is turned on in per architecture header
files. Most of the time, it is defined in arch/*/include/asm/pgtable.h
depending or not on some other per architecture static definition.

This patch introduce a new configuration variable to manage this directly
in the Kconfig files. It would later replace __HAVE_ARCH_PTE_SPECIAL.

Here notes for some architecture where the definition of
__HAVE_ARCH_PTE_SPECIAL is not obvious:

arm
 __HAVE_ARCH_PTE_SPECIAL which is currently defined in
arch/arm/include/asm/pgtable-3level.h which is included by
arch/arm/include/asm/pgtable.h when CONFIG_ARM_LPAE is set.
So select ARCH_HAS_PTE_SPECIAL if ARM_LPAE.

powerpc
__HAVE_ARCH_PTE_SPECIAL is defined in 2 files:
 - arch/powerpc/include/asm/book3s/64/pgtable.h
 - arch/powerpc/include/asm/pte-common.h
The first one is included if (PPC_BOOK3S & PPC64) while the second is
included in all the other cases.
So select ARCH_HAS_PTE_SPECIAL all the time.

sparc:
__HAVE_ARCH_PTE_SPECIAL is defined if defined(__sparc__) &&
defined(__arch64__) which are defined through the compiler in
sparc/Makefile if !SPARC32 which I assume to be if SPARC64.
So select ARCH_HAS_PTE_SPECIAL if SPARC64

There is no functional change introduced by this patch.

Suggested-by: Jerome Glisse <jglisse@redhat>
Reviewed-by: Jerome Glisse <jglisse@redhat>
Signed-off-by: Laurent Dufour <ldufour@linux.vnet.ibm.com>
---
 Documentation/features/vm/pte_special/arch-support.txt | 2 +-
 arch/arc/Kconfig                                       | 1 +
 arch/arc/include/asm/pgtable.h                         | 2 --
 arch/arm/Kconfig                                       | 1 +
 arch/arm/include/asm/pgtable-3level.h                  | 1 -
 arch/arm64/Kconfig                                     | 1 +
 arch/arm64/include/asm/pgtable.h                       | 2 --
 arch/powerpc/Kconfig                                   | 1 +
 arch/powerpc/include/asm/book3s/64/pgtable.h           | 3 ---
 arch/powerpc/include/asm/pte-common.h                  | 3 ---
 arch/riscv/Kconfig                                     | 1 +
 arch/s390/Kconfig                                      | 1 +
 arch/s390/include/asm/pgtable.h                        | 1 -
 arch/sh/Kconfig                                        | 1 +
 arch/sh/include/asm/pgtable.h                          | 2 --
 arch/sparc/Kconfig                                     | 1 +
 arch/sparc/include/asm/pgtable_64.h                    | 3 ---
 arch/x86/Kconfig                                       | 1 +
 arch/x86/include/asm/pgtable_types.h                   | 1 -
 include/linux/pfn_t.h                                  | 4 ++--
 mm/Kconfig                                             | 3 +++
 mm/gup.c                                               | 4 ++--
 mm/memory.c                                            | 2 +-
 23 files changed, 18 insertions(+), 24 deletions(-)

diff --git a/Documentation/features/vm/pte_special/arch-support.txt b/Documentation/features/vm/pte_special/arch-support.txt
index 055004f467d2..cd05924ea875 100644
--- a/Documentation/features/vm/pte_special/arch-support.txt
+++ b/Documentation/features/vm/pte_special/arch-support.txt
@@ -1,6 +1,6 @@
 #
 # Feature name:          pte_special
-#         Kconfig:       __HAVE_ARCH_PTE_SPECIAL
+#         Kconfig:       ARCH_HAS_PTE_SPECIAL
 #         description:   arch supports the pte_special()/pte_mkspecial() VM APIs
 #
     -----------------------
diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig
index d76bf4a83740..8516e2b0239a 100644
--- a/arch/arc/Kconfig
+++ b/arch/arc/Kconfig
@@ -44,6 +44,7 @@ config ARC
 	select HAVE_GENERIC_DMA_COHERENT
 	select HAVE_KERNEL_GZIP
 	select HAVE_KERNEL_LZMA
+	select ARCH_HAS_PTE_SPECIAL
 
 config MIGHT_HAVE_PCI
 	bool
diff --git a/arch/arc/include/asm/pgtable.h b/arch/arc/include/asm/pgtable.h
index 08fe33830d4b..8ec5599a0957 100644
--- a/arch/arc/include/asm/pgtable.h
+++ b/arch/arc/include/asm/pgtable.h
@@ -320,8 +320,6 @@ PTE_BIT_FUNC(mkexec,	|= (_PAGE_EXECUTE));
 PTE_BIT_FUNC(mkspecial,	|= (_PAGE_SPECIAL));
 PTE_BIT_FUNC(mkhuge,	|= (_PAGE_HW_SZ));
 
-#define __HAVE_ARCH_PTE_SPECIAL
-
 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 {
 	return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot));
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index a7f8e7f4b88f..c088c851b235 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -8,6 +8,7 @@ config ARM
 	select ARCH_HAS_DEVMEM_IS_ALLOWED
 	select ARCH_HAS_ELF_RANDOMIZE
 	select ARCH_HAS_FORTIFY_SOURCE
+	select ARCH_HAS_PTE_SPECIAL if ARM_LPAE
 	select ARCH_HAS_SET_MEMORY
 	select ARCH_HAS_PHYS_TO_DMA
 	select ARCH_HAS_STRICT_KERNEL_RWX if MMU && !XIP_KERNEL
diff --git a/arch/arm/include/asm/pgtable-3level.h b/arch/arm/include/asm/pgtable-3level.h
index 2a4836087358..6d50a11d7793 100644
--- a/arch/arm/include/asm/pgtable-3level.h
+++ b/arch/arm/include/asm/pgtable-3level.h
@@ -219,7 +219,6 @@ static inline pte_t pte_mkspecial(pte_t pte)
 	pte_val(pte) |= L_PTE_SPECIAL;
 	return pte;
 }
-#define	__HAVE_ARCH_PTE_SPECIAL
 
 #define pmd_write(pmd)		(pmd_isclear((pmd), L_PMD_SECT_RDONLY))
 #define pmd_dirty(pmd)		(pmd_isset((pmd), L_PMD_SECT_DIRTY))
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index eb2cf4938f6d..9a3f1b1ab50c 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -17,6 +17,7 @@ config ARM64
 	select ARCH_HAS_GIGANTIC_PAGE if (MEMORY_ISOLATION && COMPACTION) || CMA
 	select ARCH_HAS_KCOV
 	select ARCH_HAS_MEMBARRIER_SYNC_CORE
+	select ARCH_HAS_PTE_SPECIAL
 	select ARCH_HAS_SET_MEMORY
 	select ARCH_HAS_SG_CHAIN
 	select ARCH_HAS_STRICT_KERNEL_RWX
diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
index 7e2c27e63cd8..b96c8a186908 100644
--- a/arch/arm64/include/asm/pgtable.h
+++ b/arch/arm64/include/asm/pgtable.h
@@ -306,8 +306,6 @@ static inline int pte_same(pte_t pte_a, pte_t pte_b)
 #define HPAGE_MASK		(~(HPAGE_SIZE - 1))
 #define HUGETLB_PAGE_ORDER	(HPAGE_SHIFT - PAGE_SHIFT)
 
-#define __HAVE_ARCH_PTE_SPECIAL
-
 static inline pte_t pgd_pte(pgd_t pgd)
 {
 	return __pte(pgd_val(pgd));
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index c32a181a7cbb..f7415fe25c07 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -141,6 +141,7 @@ config PPC
 	select ARCH_HAS_GCOV_PROFILE_ALL
 	select ARCH_HAS_PHYS_TO_DMA
 	select ARCH_HAS_PMEM_API                if PPC64
+	select ARCH_HAS_PTE_SPECIAL
 	select ARCH_HAS_MEMBARRIER_CALLBACKS
 	select ARCH_HAS_SCALED_CPUTIME		if VIRT_CPU_ACCOUNTING_NATIVE
 	select ARCH_HAS_SG_CHAIN
diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h b/arch/powerpc/include/asm/book3s/64/pgtable.h
index 47b5ffc8715d..b3ac8948b257 100644
--- a/arch/powerpc/include/asm/book3s/64/pgtable.h
+++ b/arch/powerpc/include/asm/book3s/64/pgtable.h
@@ -319,9 +319,6 @@ extern unsigned long pci_io_base;
 /* Advertise special mapping type for AGP */
 #define HAVE_PAGE_AGP
 
-/* Advertise support for _PAGE_SPECIAL */
-#define __HAVE_ARCH_PTE_SPECIAL
-
 #ifndef __ASSEMBLY__
 
 /*
diff --git a/arch/powerpc/include/asm/pte-common.h b/arch/powerpc/include/asm/pte-common.h
index c4a72c7a8c83..03dfddb1f49a 100644
--- a/arch/powerpc/include/asm/pte-common.h
+++ b/arch/powerpc/include/asm/pte-common.h
@@ -216,9 +216,6 @@ static inline bool pte_user(pte_t pte)
 #define PAGE_AGP		(PAGE_KERNEL_NC)
 #define HAVE_PAGE_AGP
 
-/* Advertise support for _PAGE_SPECIAL */
-#define __HAVE_ARCH_PTE_SPECIAL
-
 #ifndef _PAGE_READ
 /* if not defined, we should not find _PAGE_WRITE too */
 #define _PAGE_READ 0
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index 5287c1441d66..b01c183836e5 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -34,6 +34,7 @@ config RISCV
 	select THREAD_INFO_IN_TASK
 	select RISCV_TIMER
 	select GENERIC_IRQ_MULTI_HANDLER
+	select ARCH_HAS_PTE_SPECIAL
 
 config MMU
 	def_bool y
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index 32a0d5b958bf..5f1f4997e7e9 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -72,6 +72,7 @@ config S390
 	select ARCH_HAS_GCOV_PROFILE_ALL
 	select ARCH_HAS_GIGANTIC_PAGE if (MEMORY_ISOLATION && COMPACTION) || CMA
 	select ARCH_HAS_KCOV
+	select ARCH_HAS_PTE_SPECIAL
 	select ARCH_HAS_SET_MEMORY
 	select ARCH_HAS_SG_CHAIN
 	select ARCH_HAS_STRICT_KERNEL_RWX
diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h
index 2d24d33bf188..9809694e1389 100644
--- a/arch/s390/include/asm/pgtable.h
+++ b/arch/s390/include/asm/pgtable.h
@@ -171,7 +171,6 @@ static inline int is_module_addr(void *addr)
 #define _PAGE_WRITE	0x020		/* SW pte write bit */
 #define _PAGE_SPECIAL	0x040		/* SW associated with special page */
 #define _PAGE_UNUSED	0x080		/* SW bit for pgste usage state */
-#define __HAVE_ARCH_PTE_SPECIAL
 
 #ifdef CONFIG_MEM_SOFT_DIRTY
 #define _PAGE_SOFT_DIRTY 0x002		/* SW pte soft dirty bit */
diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index 97fe29316476..a6c75b6806d2 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -50,6 +50,7 @@ config SUPERH
 	select HAVE_ARCH_AUDITSYSCALL
 	select HAVE_FUTEX_CMPXCHG if FUTEX
 	select HAVE_NMI
+	select ARCH_HAS_PTE_SPECIAL
 	help
 	  The SuperH is a RISC processor targeted for use in embedded systems
 	  and consumer electronics; it was also used in the Sega Dreamcast
diff --git a/arch/sh/include/asm/pgtable.h b/arch/sh/include/asm/pgtable.h
index 89c513a982fc..f6abfe2bca93 100644
--- a/arch/sh/include/asm/pgtable.h
+++ b/arch/sh/include/asm/pgtable.h
@@ -156,8 +156,6 @@ extern void page_table_range_init(unsigned long start, unsigned long end,
 #define HAVE_ARCH_UNMAPPED_AREA
 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
 
-#define __HAVE_ARCH_PTE_SPECIAL
-
 #include <asm-generic/pgtable.h>
 
 #endif /* __ASM_SH_PGTABLE_H */
diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
index 8767e45f1b2b..6b5a4f05dcb2 100644
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig
@@ -86,6 +86,7 @@ config SPARC64
 	select ARCH_USE_QUEUED_SPINLOCKS
 	select GENERIC_TIME_VSYSCALL
 	select ARCH_CLOCKSOURCE_DATA
+	select ARCH_HAS_PTE_SPECIAL
 
 config ARCH_DEFCONFIG
 	string
diff --git a/arch/sparc/include/asm/pgtable_64.h b/arch/sparc/include/asm/pgtable_64.h
index 44d6ac47e035..1393a8ac596b 100644
--- a/arch/sparc/include/asm/pgtable_64.h
+++ b/arch/sparc/include/asm/pgtable_64.h
@@ -117,9 +117,6 @@ bool kern_addr_valid(unsigned long addr);
 #define _PAGE_PMD_HUGE    _AC(0x0100000000000000,UL) /* Huge page            */
 #define _PAGE_PUD_HUGE    _PAGE_PMD_HUGE
 
-/* Advertise support for _PAGE_SPECIAL */
-#define __HAVE_ARCH_PTE_SPECIAL
-
 /* SUN4U pte bits... */
 #define _PAGE_SZ4MB_4U	  _AC(0x6000000000000000,UL) /* 4MB Page             */
 #define _PAGE_SZ512K_4U	  _AC(0x4000000000000000,UL) /* 512K Page            */
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index bf4ddea48e61..3f5fb25486bf 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -56,6 +56,7 @@ config X86
 	select ARCH_HAS_KCOV			if X86_64
 	select ARCH_HAS_MEMBARRIER_SYNC_CORE
 	select ARCH_HAS_PMEM_API		if X86_64
+	select ARCH_HAS_PTE_SPECIAL
 	select ARCH_HAS_REFCOUNT
 	select ARCH_HAS_UACCESS_FLUSHCACHE	if X86_64
 	select ARCH_HAS_SET_MEMORY
diff --git a/arch/x86/include/asm/pgtable_types.h b/arch/x86/include/asm/pgtable_types.h
index acfe755562a6..3e195728d7d1 100644
--- a/arch/x86/include/asm/pgtable_types.h
+++ b/arch/x86/include/asm/pgtable_types.h
@@ -65,7 +65,6 @@
 #define _PAGE_PKEY_BIT2	(_AT(pteval_t, 0))
 #define _PAGE_PKEY_BIT3	(_AT(pteval_t, 0))
 #endif
-#define __HAVE_ARCH_PTE_SPECIAL
 
 #define _PAGE_PKEY_MASK (_PAGE_PKEY_BIT0 | \
 			 _PAGE_PKEY_BIT1 | \
diff --git a/include/linux/pfn_t.h b/include/linux/pfn_t.h
index a03c2642a87c..21713dc14ce2 100644
--- a/include/linux/pfn_t.h
+++ b/include/linux/pfn_t.h
@@ -122,7 +122,7 @@ pud_t pud_mkdevmap(pud_t pud);
 #endif
 #endif /* __HAVE_ARCH_PTE_DEVMAP */
 
-#ifdef __HAVE_ARCH_PTE_SPECIAL
+#ifdef CONFIG_ARCH_HAS_PTE_SPECIAL
 static inline bool pfn_t_special(pfn_t pfn)
 {
 	return (pfn.val & PFN_SPECIAL) == PFN_SPECIAL;
@@ -132,5 +132,5 @@ static inline bool pfn_t_special(pfn_t pfn)
 {
 	return false;
 }
-#endif /* __HAVE_ARCH_PTE_SPECIAL */
+#endif /* CONFIG_ARCH_HAS_PTE_SPECIAL */
 #endif /* _LINUX_PFN_T_H_ */
diff --git a/mm/Kconfig b/mm/Kconfig
index d5004d82a1d6..1ea3e4a6a123 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -752,3 +752,6 @@ config GUP_BENCHMARK
 	  performance of get_user_pages_fast().
 
 	  See tools/testing/selftests/vm/gup_benchmark.c
+
+config ARCH_HAS_PTE_SPECIAL
+	bool
diff --git a/mm/gup.c b/mm/gup.c
index f296df6cf666..b044a3d14dc5 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -1351,7 +1351,7 @@ static void undo_dev_pagemap(int *nr, int nr_start, struct page **pages)
 	}
 }
 
-#ifdef __HAVE_ARCH_PTE_SPECIAL
+#ifdef CONFIG_ARCH_HAS_PTE_SPECIAL
 static int gup_pte_range(pmd_t pmd, unsigned long addr, unsigned long end,
 			 int write, struct page **pages, int *nr)
 {
@@ -1427,7 +1427,7 @@ static int gup_pte_range(pmd_t pmd, unsigned long addr, unsigned long end,
 {
 	return 0;
 }
-#endif /* __HAVE_ARCH_PTE_SPECIAL */
+#endif /* CONFIG_ARCH_HAS_PTE_SPECIAL */
 
 #if defined(__HAVE_ARCH_PTE_DEVMAP) && defined(CONFIG_TRANSPARENT_HUGEPAGE)
 static int __gup_device_huge(unsigned long pfn, unsigned long addr,
diff --git a/mm/memory.c b/mm/memory.c
index a1f990e33e38..96910c625daa 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -817,7 +817,7 @@ static void print_bad_pte(struct vm_area_struct *vma, unsigned long addr,
  * PFNMAP mappings in order to support COWable mappings.
  *
  */
-#ifdef __HAVE_ARCH_PTE_SPECIAL
+#ifdef CONFIG_ARCH_HAS_PTE_SPECIAL
 # define HAVE_PTE_SPECIAL 1
 #else
 # define HAVE_PTE_SPECIAL 0
-- 
2.7.4

^ permalink raw reply related	[flat|nested] 55+ messages in thread
* [PATCH v2 2/2] mm: remove odd HAVE_PTE_SPECIAL
  2018-04-10 15:25 ` Laurent Dufour
                     ` (3 preceding siblings ...)
  (?)
@ 2018-04-10 15:25   ` Laurent Dufour
  -1 siblings, 0 replies; 55+ messages in thread
From: Laurent Dufour @ 2018-04-10 15:25 UTC (permalink / raw)
  To: linux-arm-kernel

Remove the additional define HAVE_PTE_SPECIAL and rely directly on
CONFIG_ARCH_HAS_PTE_SPECIAL.

There is no functional change introduced by this patch

Signed-off-by: Laurent Dufour <ldufour@linux.vnet.ibm.com>
---
 mm/memory.c | 23 ++++++++++-------------
 1 file changed, 10 insertions(+), 13 deletions(-)

diff --git a/mm/memory.c b/mm/memory.c
index 96910c625daa..53b6344a90d2 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -817,19 +817,13 @@ static void print_bad_pte(struct vm_area_struct *vma, unsigned long addr,
  * PFNMAP mappings in order to support COWable mappings.
  *
  */
-#ifdef CONFIG_ARCH_HAS_PTE_SPECIAL
-# define HAVE_PTE_SPECIAL 1
-#else
-# define HAVE_PTE_SPECIAL 0
-#endif
 struct page *_vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
 			     pte_t pte, bool with_public_device)
 {
 	unsigned long pfn = pte_pfn(pte);
 
-	if (HAVE_PTE_SPECIAL) {
-		if (likely(!pte_special(pte)))
-			goto check_pfn;
+#ifdef CONFIG_ARCH_HAS_PTE_SPECIAL
+	if (unlikely(pte_special(pte))) {
 		if (vma->vm_ops && vma->vm_ops->find_special_page)
 			return vma->vm_ops->find_special_page(vma, addr);
 		if (vma->vm_flags & (VM_PFNMAP | VM_MIXEDMAP))
@@ -862,7 +856,7 @@ struct page *_vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
 		return NULL;
 	}
 
-	/* !HAVE_PTE_SPECIAL case follows: */
+#else	/* CONFIG_ARCH_HAS_PTE_SPECIAL */
 
 	if (unlikely(vma->vm_flags & (VM_PFNMAP|VM_MIXEDMAP))) {
 		if (vma->vm_flags & VM_MIXEDMAP) {
@@ -881,7 +875,8 @@ struct page *_vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
 
 	if (is_zero_pfn(pfn))
 		return NULL;
-check_pfn:
+#endif /* CONFIG_ARCH_HAS_PTE_SPECIAL */
+
 	if (unlikely(pfn > highest_memmap_pfn)) {
 		print_bad_pte(vma, addr, pte, NULL);
 		return NULL;
@@ -891,7 +886,7 @@ struct page *_vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
 	 * NOTE! We still have PageReserved() pages in the page tables.
 	 * eg. VDSO mappings can cause them to exist.
 	 */
-out:
+out: __maybe_unused
 	return pfn_to_page(pfn);
 }
 
@@ -904,7 +899,7 @@ struct page *vm_normal_page_pmd(struct vm_area_struct *vma, unsigned long addr,
 	/*
 	 * There is no pmd_special() but there may be special pmds, e.g.
 	 * in a direct-access (dax) mapping, so let's just replicate the
-	 * !HAVE_PTE_SPECIAL case from vm_normal_page() here.
+	 * !CONFIG_ARCH_HAS_PTE_SPECIAL case from vm_normal_page() here.
 	 */
 	if (unlikely(vma->vm_flags & (VM_PFNMAP|VM_MIXEDMAP))) {
 		if (vma->vm_flags & VM_MIXEDMAP) {
@@ -1926,6 +1921,7 @@ static int __vm_insert_mixed(struct vm_area_struct *vma, unsigned long addr,
 
 	track_pfn_insert(vma, &pgprot, pfn);
 
+#ifndef CONFIG_ARCH_HAS_PTE_SPECIAL
 	/*
 	 * If we don't have pte special, then we have to use the pfn_valid()
 	 * based VM_MIXEDMAP scheme (see vm_normal_page), and thus we *must*
@@ -1933,7 +1929,7 @@ static int __vm_insert_mixed(struct vm_area_struct *vma, unsigned long addr,
 	 * than insert_pfn).  If a zero_pfn were inserted into a VM_MIXEDMAP
 	 * without pte special, it would there be refcounted as a normal page.
 	 */
-	if (!HAVE_PTE_SPECIAL && !pfn_t_devmap(pfn) && pfn_t_valid(pfn)) {
+	if (!pfn_t_devmap(pfn) && pfn_t_valid(pfn)) {
 		struct page *page;
 
 		/*
@@ -1944,6 +1940,7 @@ static int __vm_insert_mixed(struct vm_area_struct *vma, unsigned long addr,
 		page = pfn_to_page(pfn_t_to_pfn(pfn));
 		return insert_page(vma, addr, page, pgprot);
 	}
+#endif
 	return insert_pfn(vma, addr, pfn, pgprot, mkwrite);
 }
 
-- 
2.7.4


^ permalink raw reply related	[flat|nested] 55+ messages in thread
* [PATCH v2 2/2] mm: remove odd HAVE_PTE_SPECIAL
@ 2018-04-10 15:25   ` Laurent Dufour
  0 siblings, 0 replies; 55+ messages in thread
From: Laurent Dufour @ 2018-04-10 15:25 UTC (permalink / raw)
  To: linux-kernel, linux-mm, linuxppc-dev, x86, linux-doc,
	linux-snps-arc, linux-arm-kernel, linux-riscv, linux-s390,
	linux-sh, sparclinux, Jerome Glisse, mhocko, aneesh.kumar, akpm,
	mpe, benh, paulus, Jonathan Corbet, Catalin Marinas, Will Deacon,
	Yoshinori Sato, Rich Felker, David S . Miller, Thomas Gleixner,
	Ingo Molnar, Vineet Gupta, Palmer Dabbelt, Albert Ou,
	Martin Schwidefsky, Heiko Carstens, David Rientjes

Remove the additional define HAVE_PTE_SPECIAL and rely directly on
CONFIG_ARCH_HAS_PTE_SPECIAL.

There is no functional change introduced by this patch

Signed-off-by: Laurent Dufour <ldufour@linux.vnet.ibm.com>
---
 mm/memory.c | 23 ++++++++++-------------
 1 file changed, 10 insertions(+), 13 deletions(-)

diff --git a/mm/memory.c b/mm/memory.c
index 96910c625daa..53b6344a90d2 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -817,19 +817,13 @@ static void print_bad_pte(struct vm_area_struct *vma, unsigned long addr,
  * PFNMAP mappings in order to support COWable mappings.
  *
  */
-#ifdef CONFIG_ARCH_HAS_PTE_SPECIAL
-# define HAVE_PTE_SPECIAL 1
-#else
-# define HAVE_PTE_SPECIAL 0
-#endif
 struct page *_vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
 			     pte_t pte, bool with_public_device)
 {
 	unsigned long pfn = pte_pfn(pte);
 
-	if (HAVE_PTE_SPECIAL) {
-		if (likely(!pte_special(pte)))
-			goto check_pfn;
+#ifdef CONFIG_ARCH_HAS_PTE_SPECIAL
+	if (unlikely(pte_special(pte))) {
 		if (vma->vm_ops && vma->vm_ops->find_special_page)
 			return vma->vm_ops->find_special_page(vma, addr);
 		if (vma->vm_flags & (VM_PFNMAP | VM_MIXEDMAP))
@@ -862,7 +856,7 @@ struct page *_vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
 		return NULL;
 	}
 
-	/* !HAVE_PTE_SPECIAL case follows: */
+#else	/* CONFIG_ARCH_HAS_PTE_SPECIAL */
 
 	if (unlikely(vma->vm_flags & (VM_PFNMAP|VM_MIXEDMAP))) {
 		if (vma->vm_flags & VM_MIXEDMAP) {
@@ -881,7 +875,8 @@ struct page *_vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
 
 	if (is_zero_pfn(pfn))
 		return NULL;
-check_pfn:
+#endif /* CONFIG_ARCH_HAS_PTE_SPECIAL */
+
 	if (unlikely(pfn > highest_memmap_pfn)) {
 		print_bad_pte(vma, addr, pte, NULL);
 		return NULL;
@@ -891,7 +886,7 @@ struct page *_vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
 	 * NOTE! We still have PageReserved() pages in the page tables.
 	 * eg. VDSO mappings can cause them to exist.
 	 */
-out:
+out: __maybe_unused
 	return pfn_to_page(pfn);
 }
 
@@ -904,7 +899,7 @@ struct page *vm_normal_page_pmd(struct vm_area_struct *vma, unsigned long addr,
 	/*
 	 * There is no pmd_special() but there may be special pmds, e.g.
 	 * in a direct-access (dax) mapping, so let's just replicate the
-	 * !HAVE_PTE_SPECIAL case from vm_normal_page() here.
+	 * !CONFIG_ARCH_HAS_PTE_SPECIAL case from vm_normal_page() here.
 	 */
 	if (unlikely(vma->vm_flags & (VM_PFNMAP|VM_MIXEDMAP))) {
 		if (vma->vm_flags & VM_MIXEDMAP) {
@@ -1926,6 +1921,7 @@ static int __vm_insert_mixed(struct vm_area_struct *vma, unsigned long addr,
 
 	track_pfn_insert(vma, &pgprot, pfn);
 
+#ifndef CONFIG_ARCH_HAS_PTE_SPECIAL
 	/*
 	 * If we don't have pte special, then we have to use the pfn_valid()
 	 * based VM_MIXEDMAP scheme (see vm_normal_page), and thus we *must*
@@ -1933,7 +1929,7 @@ static int __vm_insert_mixed(struct vm_area_struct *vma, unsigned long addr,
 	 * than insert_pfn).  If a zero_pfn were inserted into a VM_MIXEDMAP
 	 * without pte special, it would there be refcounted as a normal page.
 	 */
-	if (!HAVE_PTE_SPECIAL && !pfn_t_devmap(pfn) && pfn_t_valid(pfn)) {
+	if (!pfn_t_devmap(pfn) && pfn_t_valid(pfn)) {
 		struct page *page;
 
 		/*
@@ -1944,6 +1940,7 @@ static int __vm_insert_mixed(struct vm_area_struct *vma, unsigned long addr,
 		page = pfn_to_page(pfn_t_to_pfn(pfn));
 		return insert_page(vma, addr, page, pgprot);
 	}
+#endif
 	return insert_pfn(vma, addr, pfn, pgprot, mkwrite);
 }
 
-- 
2.7.4

^ permalink raw reply related	[flat|nested] 55+ messages in thread
* [PATCH v2 2/2] mm: remove odd HAVE_PTE_SPECIAL
@ 2018-04-10 15:25   ` Laurent Dufour
  0 siblings, 0 replies; 55+ messages in thread
From: Laurent Dufour @ 2018-04-10 15:25 UTC (permalink / raw)
  To: linux-kernel, linux-mm, linuxppc-dev, x86, linux-doc,
	linux-snps-arc, linux-arm-kernel, linux-riscv, linux-s390,
	linux-sh, sparclinux, Jerome Glisse, mhocko, aneesh.kumar, akpm,
	mpe, benh, paulus, Jonathan Corbet, Catalin Marinas, Will Deacon,
	Yoshinori Sato, Rich Felker, David S . Miller, Thomas Gleixner,
	Ingo Molnar, Vineet Gupta, Palmer Dabbelt, Albert Ou,
	Martin Schwidefsky, Heiko Carstens, David Rientjes

Remove the additional define HAVE_PTE_SPECIAL and rely directly on
CONFIG_ARCH_HAS_PTE_SPECIAL.

There is no functional change introduced by this patch

Signed-off-by: Laurent Dufour <ldufour@linux.vnet.ibm.com>
---
 mm/memory.c | 23 ++++++++++-------------
 1 file changed, 10 insertions(+), 13 deletions(-)

diff --git a/mm/memory.c b/mm/memory.c
index 96910c625daa..53b6344a90d2 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -817,19 +817,13 @@ static void print_bad_pte(struct vm_area_struct *vma, unsigned long addr,
  * PFNMAP mappings in order to support COWable mappings.
  *
  */
-#ifdef CONFIG_ARCH_HAS_PTE_SPECIAL
-# define HAVE_PTE_SPECIAL 1
-#else
-# define HAVE_PTE_SPECIAL 0
-#endif
 struct page *_vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
 			     pte_t pte, bool with_public_device)
 {
 	unsigned long pfn = pte_pfn(pte);
 
-	if (HAVE_PTE_SPECIAL) {
-		if (likely(!pte_special(pte)))
-			goto check_pfn;
+#ifdef CONFIG_ARCH_HAS_PTE_SPECIAL
+	if (unlikely(pte_special(pte))) {
 		if (vma->vm_ops && vma->vm_ops->find_special_page)
 			return vma->vm_ops->find_special_page(vma, addr);
 		if (vma->vm_flags & (VM_PFNMAP | VM_MIXEDMAP))
@@ -862,7 +856,7 @@ struct page *_vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
 		return NULL;
 	}
 
-	/* !HAVE_PTE_SPECIAL case follows: */
+#else	/* CONFIG_ARCH_HAS_PTE_SPECIAL */
 
 	if (unlikely(vma->vm_flags & (VM_PFNMAP|VM_MIXEDMAP))) {
 		if (vma->vm_flags & VM_MIXEDMAP) {
@@ -881,7 +875,8 @@ struct page *_vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
 
 	if (is_zero_pfn(pfn))
 		return NULL;
-check_pfn:
+#endif /* CONFIG_ARCH_HAS_PTE_SPECIAL */
+
 	if (unlikely(pfn > highest_memmap_pfn)) {
 		print_bad_pte(vma, addr, pte, NULL);
 		return NULL;
@@ -891,7 +886,7 @@ struct page *_vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
 	 * NOTE! We still have PageReserved() pages in the page tables.
 	 * eg. VDSO mappings can cause them to exist.
 	 */
-out:
+out: __maybe_unused
 	return pfn_to_page(pfn);
 }
 
@@ -904,7 +899,7 @@ struct page *vm_normal_page_pmd(struct vm_area_struct *vma, unsigned long addr,
 	/*
 	 * There is no pmd_special() but there may be special pmds, e.g.
 	 * in a direct-access (dax) mapping, so let's just replicate the
-	 * !HAVE_PTE_SPECIAL case from vm_normal_page() here.
+	 * !CONFIG_ARCH_HAS_PTE_SPECIAL case from vm_normal_page() here.
 	 */
 	if (unlikely(vma->vm_flags & (VM_PFNMAP|VM_MIXEDMAP))) {
 		if (vma->vm_flags & VM_MIXEDMAP) {
@@ -1926,6 +1921,7 @@ static int __vm_insert_mixed(struct vm_area_struct *vma, unsigned long addr,
 
 	track_pfn_insert(vma, &pgprot, pfn);
 
+#ifndef CONFIG_ARCH_HAS_PTE_SPECIAL
 	/*
 	 * If we don't have pte special, then we have to use the pfn_valid()
 	 * based VM_MIXEDMAP scheme (see vm_normal_page), and thus we *must*
@@ -1933,7 +1929,7 @@ static int __vm_insert_mixed(struct vm_area_struct *vma, unsigned long addr,
 	 * than insert_pfn).  If a zero_pfn were inserted into a VM_MIXEDMAP
 	 * without pte special, it would there be refcounted as a normal page.
 	 */
-	if (!HAVE_PTE_SPECIAL && !pfn_t_devmap(pfn) && pfn_t_valid(pfn)) {
+	if (!pfn_t_devmap(pfn) && pfn_t_valid(pfn)) {
 		struct page *page;
 
 		/*
@@ -1944,6 +1940,7 @@ static int __vm_insert_mixed(struct vm_area_struct *vma, unsigned long addr,
 		page = pfn_to_page(pfn_t_to_pfn(pfn));
 		return insert_page(vma, addr, page, pgprot);
 	}
+#endif
 	return insert_pfn(vma, addr, pfn, pgprot, mkwrite);
 }
 
-- 
2.7.4

--
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^ permalink raw reply related	[flat|nested] 55+ messages in thread
* [PATCH v2 2/2] mm: remove odd HAVE_PTE_SPECIAL
@ 2018-04-10 15:25   ` Laurent Dufour
  0 siblings, 0 replies; 55+ messages in thread
From: Laurent Dufour @ 2018-04-10 15:25 UTC (permalink / raw)
  To: linux-riscv

Remove the additional define HAVE_PTE_SPECIAL and rely directly on
CONFIG_ARCH_HAS_PTE_SPECIAL.

There is no functional change introduced by this patch

Signed-off-by: Laurent Dufour <ldufour@linux.vnet.ibm.com>
---
 mm/memory.c | 23 ++++++++++-------------
 1 file changed, 10 insertions(+), 13 deletions(-)

diff --git a/mm/memory.c b/mm/memory.c
index 96910c625daa..53b6344a90d2 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -817,19 +817,13 @@ static void print_bad_pte(struct vm_area_struct *vma, unsigned long addr,
  * PFNMAP mappings in order to support COWable mappings.
  *
  */
-#ifdef CONFIG_ARCH_HAS_PTE_SPECIAL
-# define HAVE_PTE_SPECIAL 1
-#else
-# define HAVE_PTE_SPECIAL 0
-#endif
 struct page *_vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
 			     pte_t pte, bool with_public_device)
 {
 	unsigned long pfn = pte_pfn(pte);
 
-	if (HAVE_PTE_SPECIAL) {
-		if (likely(!pte_special(pte)))
-			goto check_pfn;
+#ifdef CONFIG_ARCH_HAS_PTE_SPECIAL
+	if (unlikely(pte_special(pte))) {
 		if (vma->vm_ops && vma->vm_ops->find_special_page)
 			return vma->vm_ops->find_special_page(vma, addr);
 		if (vma->vm_flags & (VM_PFNMAP | VM_MIXEDMAP))
@@ -862,7 +856,7 @@ struct page *_vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
 		return NULL;
 	}
 
-	/* !HAVE_PTE_SPECIAL case follows: */
+#else	/* CONFIG_ARCH_HAS_PTE_SPECIAL */
 
 	if (unlikely(vma->vm_flags & (VM_PFNMAP|VM_MIXEDMAP))) {
 		if (vma->vm_flags & VM_MIXEDMAP) {
@@ -881,7 +875,8 @@ struct page *_vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
 
 	if (is_zero_pfn(pfn))
 		return NULL;
-check_pfn:
+#endif /* CONFIG_ARCH_HAS_PTE_SPECIAL */
+
 	if (unlikely(pfn > highest_memmap_pfn)) {
 		print_bad_pte(vma, addr, pte, NULL);
 		return NULL;
@@ -891,7 +886,7 @@ struct page *_vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
 	 * NOTE! We still have PageReserved() pages in the page tables.
 	 * eg. VDSO mappings can cause them to exist.
 	 */
-out:
+out: __maybe_unused
 	return pfn_to_page(pfn);
 }
 
@@ -904,7 +899,7 @@ struct page *vm_normal_page_pmd(struct vm_area_struct *vma, unsigned long addr,
 	/*
 	 * There is no pmd_special() but there may be special pmds, e.g.
 	 * in a direct-access (dax) mapping, so let's just replicate the
-	 * !HAVE_PTE_SPECIAL case from vm_normal_page() here.
+	 * !CONFIG_ARCH_HAS_PTE_SPECIAL case from vm_normal_page() here.
 	 */
 	if (unlikely(vma->vm_flags & (VM_PFNMAP|VM_MIXEDMAP))) {
 		if (vma->vm_flags & VM_MIXEDMAP) {
@@ -1926,6 +1921,7 @@ static int __vm_insert_mixed(struct vm_area_struct *vma, unsigned long addr,
 
 	track_pfn_insert(vma, &pgprot, pfn);
 
+#ifndef CONFIG_ARCH_HAS_PTE_SPECIAL
 	/*
 	 * If we don't have pte special, then we have to use the pfn_valid()
 	 * based VM_MIXEDMAP scheme (see vm_normal_page), and thus we *must*
@@ -1933,7 +1929,7 @@ static int __vm_insert_mixed(struct vm_area_struct *vma, unsigned long addr,
 	 * than insert_pfn).  If a zero_pfn were inserted into a VM_MIXEDMAP
 	 * without pte special, it would there be refcounted as a normal page.
 	 */
-	if (!HAVE_PTE_SPECIAL && !pfn_t_devmap(pfn) && pfn_t_valid(pfn)) {
+	if (!pfn_t_devmap(pfn) && pfn_t_valid(pfn)) {
 		struct page *page;
 
 		/*
@@ -1944,6 +1940,7 @@ static int __vm_insert_mixed(struct vm_area_struct *vma, unsigned long addr,
 		page = pfn_to_page(pfn_t_to_pfn(pfn));
 		return insert_page(vma, addr, page, pgprot);
 	}
+#endif
 	return insert_pfn(vma, addr, pfn, pgprot, mkwrite);
 }
 
-- 
2.7.4

^ permalink raw reply related	[flat|nested] 55+ messages in thread
* [PATCH v2 2/2] mm: remove odd HAVE_PTE_SPECIAL
@ 2018-04-10 15:25   ` Laurent Dufour
  0 siblings, 0 replies; 55+ messages in thread
From: Laurent Dufour @ 2018-04-10 15:25 UTC (permalink / raw)
  To: linux-snps-arc

Remove the additional define HAVE_PTE_SPECIAL and rely directly on
CONFIG_ARCH_HAS_PTE_SPECIAL.

There is no functional change introduced by this patch

Signed-off-by: Laurent Dufour <ldufour at linux.vnet.ibm.com>
---
 mm/memory.c | 23 ++++++++++-------------
 1 file changed, 10 insertions(+), 13 deletions(-)

diff --git a/mm/memory.c b/mm/memory.c
index 96910c625daa..53b6344a90d2 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -817,19 +817,13 @@ static void print_bad_pte(struct vm_area_struct *vma, unsigned long addr,
  * PFNMAP mappings in order to support COWable mappings.
  *
  */
-#ifdef CONFIG_ARCH_HAS_PTE_SPECIAL
-# define HAVE_PTE_SPECIAL 1
-#else
-# define HAVE_PTE_SPECIAL 0
-#endif
 struct page *_vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
 			     pte_t pte, bool with_public_device)
 {
 	unsigned long pfn = pte_pfn(pte);
 
-	if (HAVE_PTE_SPECIAL) {
-		if (likely(!pte_special(pte)))
-			goto check_pfn;
+#ifdef CONFIG_ARCH_HAS_PTE_SPECIAL
+	if (unlikely(pte_special(pte))) {
 		if (vma->vm_ops && vma->vm_ops->find_special_page)
 			return vma->vm_ops->find_special_page(vma, addr);
 		if (vma->vm_flags & (VM_PFNMAP | VM_MIXEDMAP))
@@ -862,7 +856,7 @@ struct page *_vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
 		return NULL;
 	}
 
-	/* !HAVE_PTE_SPECIAL case follows: */
+#else	/* CONFIG_ARCH_HAS_PTE_SPECIAL */
 
 	if (unlikely(vma->vm_flags & (VM_PFNMAP|VM_MIXEDMAP))) {
 		if (vma->vm_flags & VM_MIXEDMAP) {
@@ -881,7 +875,8 @@ struct page *_vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
 
 	if (is_zero_pfn(pfn))
 		return NULL;
-check_pfn:
+#endif /* CONFIG_ARCH_HAS_PTE_SPECIAL */
+
 	if (unlikely(pfn > highest_memmap_pfn)) {
 		print_bad_pte(vma, addr, pte, NULL);
 		return NULL;
@@ -891,7 +886,7 @@ struct page *_vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
 	 * NOTE! We still have PageReserved() pages in the page tables.
 	 * eg. VDSO mappings can cause them to exist.
 	 */
-out:
+out: __maybe_unused
 	return pfn_to_page(pfn);
 }
 
@@ -904,7 +899,7 @@ struct page *vm_normal_page_pmd(struct vm_area_struct *vma, unsigned long addr,
 	/*
 	 * There is no pmd_special() but there may be special pmds, e.g.
 	 * in a direct-access (dax) mapping, so let's just replicate the
-	 * !HAVE_PTE_SPECIAL case from vm_normal_page() here.
+	 * !CONFIG_ARCH_HAS_PTE_SPECIAL case from vm_normal_page() here.
 	 */
 	if (unlikely(vma->vm_flags & (VM_PFNMAP|VM_MIXEDMAP))) {
 		if (vma->vm_flags & VM_MIXEDMAP) {
@@ -1926,6 +1921,7 @@ static int __vm_insert_mixed(struct vm_area_struct *vma, unsigned long addr,
 
 	track_pfn_insert(vma, &pgprot, pfn);
 
+#ifndef CONFIG_ARCH_HAS_PTE_SPECIAL
 	/*
 	 * If we don't have pte special, then we have to use the pfn_valid()
 	 * based VM_MIXEDMAP scheme (see vm_normal_page), and thus we *must*
@@ -1933,7 +1929,7 @@ static int __vm_insert_mixed(struct vm_area_struct *vma, unsigned long addr,
 	 * than insert_pfn).  If a zero_pfn were inserted into a VM_MIXEDMAP
 	 * without pte special, it would there be refcounted as a normal page.
 	 */
-	if (!HAVE_PTE_SPECIAL && !pfn_t_devmap(pfn) && pfn_t_valid(pfn)) {
+	if (!pfn_t_devmap(pfn) && pfn_t_valid(pfn)) {
 		struct page *page;
 
 		/*
@@ -1944,6 +1940,7 @@ static int __vm_insert_mixed(struct vm_area_struct *vma, unsigned long addr,
 		page = pfn_to_page(pfn_t_to_pfn(pfn));
 		return insert_page(vma, addr, page, pgprot);
 	}
+#endif
 	return insert_pfn(vma, addr, pfn, pgprot, mkwrite);
 }
 
-- 
2.7.4

^ permalink raw reply related	[flat|nested] 55+ messages in thread
* [PATCH v2 2/2] mm: remove odd HAVE_PTE_SPECIAL
@ 2018-04-10 15:25   ` Laurent Dufour
  0 siblings, 0 replies; 55+ messages in thread
From: Laurent Dufour @ 2018-04-10 15:25 UTC (permalink / raw)
  To: linux-arm-kernel

Remove the additional define HAVE_PTE_SPECIAL and rely directly on
CONFIG_ARCH_HAS_PTE_SPECIAL.

There is no functional change introduced by this patch

Signed-off-by: Laurent Dufour <ldufour@linux.vnet.ibm.com>
---
 mm/memory.c | 23 ++++++++++-------------
 1 file changed, 10 insertions(+), 13 deletions(-)

diff --git a/mm/memory.c b/mm/memory.c
index 96910c625daa..53b6344a90d2 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -817,19 +817,13 @@ static void print_bad_pte(struct vm_area_struct *vma, unsigned long addr,
  * PFNMAP mappings in order to support COWable mappings.
  *
  */
-#ifdef CONFIG_ARCH_HAS_PTE_SPECIAL
-# define HAVE_PTE_SPECIAL 1
-#else
-# define HAVE_PTE_SPECIAL 0
-#endif
 struct page *_vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
 			     pte_t pte, bool with_public_device)
 {
 	unsigned long pfn = pte_pfn(pte);
 
-	if (HAVE_PTE_SPECIAL) {
-		if (likely(!pte_special(pte)))
-			goto check_pfn;
+#ifdef CONFIG_ARCH_HAS_PTE_SPECIAL
+	if (unlikely(pte_special(pte))) {
 		if (vma->vm_ops && vma->vm_ops->find_special_page)
 			return vma->vm_ops->find_special_page(vma, addr);
 		if (vma->vm_flags & (VM_PFNMAP | VM_MIXEDMAP))
@@ -862,7 +856,7 @@ struct page *_vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
 		return NULL;
 	}
 
-	/* !HAVE_PTE_SPECIAL case follows: */
+#else	/* CONFIG_ARCH_HAS_PTE_SPECIAL */
 
 	if (unlikely(vma->vm_flags & (VM_PFNMAP|VM_MIXEDMAP))) {
 		if (vma->vm_flags & VM_MIXEDMAP) {
@@ -881,7 +875,8 @@ struct page *_vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
 
 	if (is_zero_pfn(pfn))
 		return NULL;
-check_pfn:
+#endif /* CONFIG_ARCH_HAS_PTE_SPECIAL */
+
 	if (unlikely(pfn > highest_memmap_pfn)) {
 		print_bad_pte(vma, addr, pte, NULL);
 		return NULL;
@@ -891,7 +886,7 @@ struct page *_vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
 	 * NOTE! We still have PageReserved() pages in the page tables.
 	 * eg. VDSO mappings can cause them to exist.
 	 */
-out:
+out: __maybe_unused
 	return pfn_to_page(pfn);
 }
 
@@ -904,7 +899,7 @@ struct page *vm_normal_page_pmd(struct vm_area_struct *vma, unsigned long addr,
 	/*
 	 * There is no pmd_special() but there may be special pmds, e.g.
 	 * in a direct-access (dax) mapping, so let's just replicate the
-	 * !HAVE_PTE_SPECIAL case from vm_normal_page() here.
+	 * !CONFIG_ARCH_HAS_PTE_SPECIAL case from vm_normal_page() here.
 	 */
 	if (unlikely(vma->vm_flags & (VM_PFNMAP|VM_MIXEDMAP))) {
 		if (vma->vm_flags & VM_MIXEDMAP) {
@@ -1926,6 +1921,7 @@ static int __vm_insert_mixed(struct vm_area_struct *vma, unsigned long addr,
 
 	track_pfn_insert(vma, &pgprot, pfn);
 
+#ifndef CONFIG_ARCH_HAS_PTE_SPECIAL
 	/*
 	 * If we don't have pte special, then we have to use the pfn_valid()
 	 * based VM_MIXEDMAP scheme (see vm_normal_page), and thus we *must*
@@ -1933,7 +1929,7 @@ static int __vm_insert_mixed(struct vm_area_struct *vma, unsigned long addr,
 	 * than insert_pfn).  If a zero_pfn were inserted into a VM_MIXEDMAP
 	 * without pte special, it would there be refcounted as a normal page.
 	 */
-	if (!HAVE_PTE_SPECIAL && !pfn_t_devmap(pfn) && pfn_t_valid(pfn)) {
+	if (!pfn_t_devmap(pfn) && pfn_t_valid(pfn)) {
 		struct page *page;
 
 		/*
@@ -1944,6 +1940,7 @@ static int __vm_insert_mixed(struct vm_area_struct *vma, unsigned long addr,
 		page = pfn_to_page(pfn_t_to_pfn(pfn));
 		return insert_page(vma, addr, page, pgprot);
 	}
+#endif
 	return insert_pfn(vma, addr, pfn, pgprot, mkwrite);
 }
 
-- 
2.7.4

^ permalink raw reply related	[flat|nested] 55+ messages in thread
* Re: [PATCH v2 2/2] mm: remove odd HAVE_PTE_SPECIAL
  2018-04-10 15:25   ` Laurent Dufour
                       ` (3 preceding siblings ...)
  (?)
@ 2018-04-10 15:58     ` Robin Murphy
  -1 siblings, 0 replies; 55+ messages in thread
From: Robin Murphy @ 2018-04-10 15:58 UTC (permalink / raw)
  To: linux-arm-kernel

On 10/04/18 16:25, Laurent Dufour wrote:
> Remove the additional define HAVE_PTE_SPECIAL and rely directly on
> CONFIG_ARCH_HAS_PTE_SPECIAL.
> 
> There is no functional change introduced by this patch
> 
> Signed-off-by: Laurent Dufour <ldufour@linux.vnet.ibm.com>
> ---
>   mm/memory.c | 23 ++++++++++-------------
>   1 file changed, 10 insertions(+), 13 deletions(-)
> 
> diff --git a/mm/memory.c b/mm/memory.c
> index 96910c625daa..53b6344a90d2 100644
> --- a/mm/memory.c
> +++ b/mm/memory.c
> @@ -817,19 +817,13 @@ static void print_bad_pte(struct vm_area_struct *vma, unsigned long addr,
>    * PFNMAP mappings in order to support COWable mappings.
>    *
>    */
> -#ifdef CONFIG_ARCH_HAS_PTE_SPECIAL
> -# define HAVE_PTE_SPECIAL 1
> -#else
> -# define HAVE_PTE_SPECIAL 0
> -#endif
>   struct page *_vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
>   			     pte_t pte, bool with_public_device)
>   {
>   	unsigned long pfn = pte_pfn(pte);
>   
> -	if (HAVE_PTE_SPECIAL) {
> -		if (likely(!pte_special(pte)))
> -			goto check_pfn;
> +#ifdef CONFIG_ARCH_HAS_PTE_SPECIAL

Nit: Couldn't you use IS_ENABLED(CONFIG_ARCH_HAS_PTE_SPECIAL) within the 
existing code structure to avoid having to add these #ifdefs?

Robin.

> +	if (unlikely(pte_special(pte))) {
>   		if (vma->vm_ops && vma->vm_ops->find_special_page)
>   			return vma->vm_ops->find_special_page(vma, addr);
>   		if (vma->vm_flags & (VM_PFNMAP | VM_MIXEDMAP))
> @@ -862,7 +856,7 @@ struct page *_vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
>   		return NULL;
>   	}
>   
> -	/* !HAVE_PTE_SPECIAL case follows: */
> +#else	/* CONFIG_ARCH_HAS_PTE_SPECIAL */
>   
>   	if (unlikely(vma->vm_flags & (VM_PFNMAP|VM_MIXEDMAP))) {
>   		if (vma->vm_flags & VM_MIXEDMAP) {
> @@ -881,7 +875,8 @@ struct page *_vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
>   
>   	if (is_zero_pfn(pfn))
>   		return NULL;
> -check_pfn:
> +#endif /* CONFIG_ARCH_HAS_PTE_SPECIAL */
> +
>   	if (unlikely(pfn > highest_memmap_pfn)) {
>   		print_bad_pte(vma, addr, pte, NULL);
>   		return NULL;
> @@ -891,7 +886,7 @@ struct page *_vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
>   	 * NOTE! We still have PageReserved() pages in the page tables.
>   	 * eg. VDSO mappings can cause them to exist.
>   	 */
> -out:
> +out: __maybe_unused
>   	return pfn_to_page(pfn);
>   }
>   
> @@ -904,7 +899,7 @@ struct page *vm_normal_page_pmd(struct vm_area_struct *vma, unsigned long addr,
>   	/*
>   	 * There is no pmd_special() but there may be special pmds, e.g.
>   	 * in a direct-access (dax) mapping, so let's just replicate the
> -	 * !HAVE_PTE_SPECIAL case from vm_normal_page() here.
> +	 * !CONFIG_ARCH_HAS_PTE_SPECIAL case from vm_normal_page() here.
>   	 */
>   	if (unlikely(vma->vm_flags & (VM_PFNMAP|VM_MIXEDMAP))) {
>   		if (vma->vm_flags & VM_MIXEDMAP) {
> @@ -1926,6 +1921,7 @@ static int __vm_insert_mixed(struct vm_area_struct *vma, unsigned long addr,
>   
>   	track_pfn_insert(vma, &pgprot, pfn);
>   
> +#ifndef CONFIG_ARCH_HAS_PTE_SPECIAL
>   	/*
>   	 * If we don't have pte special, then we have to use the pfn_valid()
>   	 * based VM_MIXEDMAP scheme (see vm_normal_page), and thus we *must*
> @@ -1933,7 +1929,7 @@ static int __vm_insert_mixed(struct vm_area_struct *vma, unsigned long addr,
>   	 * than insert_pfn).  If a zero_pfn were inserted into a VM_MIXEDMAP
>   	 * without pte special, it would there be refcounted as a normal page.
>   	 */
> -	if (!HAVE_PTE_SPECIAL && !pfn_t_devmap(pfn) && pfn_t_valid(pfn)) {
> +	if (!pfn_t_devmap(pfn) && pfn_t_valid(pfn)) {
>   		struct page *page;
>   
>   		/*
> @@ -1944,6 +1940,7 @@ static int __vm_insert_mixed(struct vm_area_struct *vma, unsigned long addr,
>   		page = pfn_to_page(pfn_t_to_pfn(pfn));
>   		return insert_page(vma, addr, page, pgprot);
>   	}
> +#endif
>   	return insert_pfn(vma, addr, pfn, pgprot, mkwrite);
>   }
>   
> 

^ permalink raw reply	[flat|nested] 55+ messages in thread
* Re: [PATCH v2 2/2] mm: remove odd HAVE_PTE_SPECIAL
@ 2018-04-10 15:58     ` Robin Murphy
  0 siblings, 0 replies; 55+ messages in thread
From: Robin Murphy @ 2018-04-10 15:58 UTC (permalink / raw)
  To: Laurent Dufour, linux-kernel, linux-mm, linuxppc-dev, x86,
	linux-doc, linux-snps-arc, linux-arm-kernel, linux-riscv,
	linux-s390, linux-sh, sparclinux, Jerome Glisse, mhocko,
	aneesh.kumar, akpm, mpe, benh, paulus, Jonathan Corbet,
	Catalin Marinas, Will Deacon, Yoshinori Sato, Rich Felker,
	David S . Miller, Thomas Gleixner, Ingo Molnar, Vineet Gupta,
	Palmer Dabbelt, Albert Ou, Martin Schwidefsky, Heiko Carstens,
	David Rientjes

On 10/04/18 16:25, Laurent Dufour wrote:
> Remove the additional define HAVE_PTE_SPECIAL and rely directly on
> CONFIG_ARCH_HAS_PTE_SPECIAL.
> 
> There is no functional change introduced by this patch
> 
> Signed-off-by: Laurent Dufour <ldufour@linux.vnet.ibm.com>
> ---
>   mm/memory.c | 23 ++++++++++-------------
>   1 file changed, 10 insertions(+), 13 deletions(-)
> 
> diff --git a/mm/memory.c b/mm/memory.c
> index 96910c625daa..53b6344a90d2 100644
> --- a/mm/memory.c
> +++ b/mm/memory.c
> @@ -817,19 +817,13 @@ static void print_bad_pte(struct vm_area_struct *vma, unsigned long addr,
>    * PFNMAP mappings in order to support COWable mappings.
>    *
>    */
> -#ifdef CONFIG_ARCH_HAS_PTE_SPECIAL
> -# define HAVE_PTE_SPECIAL 1
> -#else
> -# define HAVE_PTE_SPECIAL 0
> -#endif
>   struct page *_vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
>   			     pte_t pte, bool with_public_device)
>   {
>   	unsigned long pfn = pte_pfn(pte);
>   
> -	if (HAVE_PTE_SPECIAL) {
> -		if (likely(!pte_special(pte)))
> -			goto check_pfn;
> +#ifdef CONFIG_ARCH_HAS_PTE_SPECIAL

Nit: Couldn't you use IS_ENABLED(CONFIG_ARCH_HAS_PTE_SPECIAL) within the 
existing code structure to avoid having to add these #ifdefs?

Robin.

> +	if (unlikely(pte_special(pte))) {
>   		if (vma->vm_ops && vma->vm_ops->find_special_page)
>   			return vma->vm_ops->find_special_page(vma, addr);
>   		if (vma->vm_flags & (VM_PFNMAP | VM_MIXEDMAP))
> @@ -862,7 +856,7 @@ struct page *_vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
>   		return NULL;
>   	}
>   
> -	/* !HAVE_PTE_SPECIAL case follows: */
> +#else	/* CONFIG_ARCH_HAS_PTE_SPECIAL */
>   
>   	if (unlikely(vma->vm_flags & (VM_PFNMAP|VM_MIXEDMAP))) {
>   		if (vma->vm_flags & VM_MIXEDMAP) {
> @@ -881,7 +875,8 @@ struct page *_vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
>   
>   	if (is_zero_pfn(pfn))
>   		return NULL;
> -check_pfn:
> +#endif /* CONFIG_ARCH_HAS_PTE_SPECIAL */
> +
>   	if (unlikely(pfn > highest_memmap_pfn)) {
>   		print_bad_pte(vma, addr, pte, NULL);
>   		return NULL;
> @@ -891,7 +886,7 @@ struct page *_vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
>   	 * NOTE! We still have PageReserved() pages in the page tables.
>   	 * eg. VDSO mappings can cause them to exist.
>   	 */
> -out:
> +out: __maybe_unused
>   	return pfn_to_page(pfn);
>   }
>   
> @@ -904,7 +899,7 @@ struct page *vm_normal_page_pmd(struct vm_area_struct *vma, unsigned long addr,
>   	/*
>   	 * There is no pmd_special() but there may be special pmds, e.g.
>   	 * in a direct-access (dax) mapping, so let's just replicate the
> -	 * !HAVE_PTE_SPECIAL case from vm_normal_page() here.
> +	 * !CONFIG_ARCH_HAS_PTE_SPECIAL case from vm_normal_page() here.
>   	 */
>   	if (unlikely(vma->vm_flags & (VM_PFNMAP|VM_MIXEDMAP))) {
>   		if (vma->vm_flags & VM_MIXEDMAP) {
> @@ -1926,6 +1921,7 @@ static int __vm_insert_mixed(struct vm_area_struct *vma, unsigned long addr,
>   
>   	track_pfn_insert(vma, &pgprot, pfn);
>   
> +#ifndef CONFIG_ARCH_HAS_PTE_SPECIAL
>   	/*
>   	 * If we don't have pte special, then we have to use the pfn_valid()
>   	 * based VM_MIXEDMAP scheme (see vm_normal_page), and thus we *must*
> @@ -1933,7 +1929,7 @@ static int __vm_insert_mixed(struct vm_area_struct *vma, unsigned long addr,
>   	 * than insert_pfn).  If a zero_pfn were inserted into a VM_MIXEDMAP
>   	 * without pte special, it would there be refcounted as a normal page.
>   	 */
> -	if (!HAVE_PTE_SPECIAL && !pfn_t_devmap(pfn) && pfn_t_valid(pfn)) {
> +	if (!pfn_t_devmap(pfn) && pfn_t_valid(pfn)) {
>   		struct page *page;
>   
>   		/*
> @@ -1944,6 +1940,7 @@ static int __vm_insert_mixed(struct vm_area_struct *vma, unsigned long addr,
>   		page = pfn_to_page(pfn_t_to_pfn(pfn));
>   		return insert_page(vma, addr, page, pgprot);
>   	}
> +#endif
>   	return insert_pfn(vma, addr, pfn, pgprot, mkwrite);
>   }
>   
> 

^ permalink raw reply	[flat|nested] 55+ messages in thread
* Re: [PATCH v2 2/2] mm: remove odd HAVE_PTE_SPECIAL
@ 2018-04-10 15:58     ` Robin Murphy
  0 siblings, 0 replies; 55+ messages in thread
From: Robin Murphy @ 2018-04-10 15:58 UTC (permalink / raw)
  To: Laurent Dufour, linux-kernel, linux-mm, linuxppc-dev, x86,
	linux-doc, linux-snps-arc, linux-arm-kernel, linux-riscv,
	linux-s390, linux-sh, sparclinux, Jerome Glisse, mhocko,
	aneesh.kumar, akpm, mpe, benh, paulus, Jonathan Corbet,
	Catalin Marinas, Will Deacon, Yoshinori Sato, Rich Felker,
	David S . Miller, Thomas Gleixner, Ingo Molnar, Vineet Gupta,
	Palmer Dabbelt, Albert Ou, Martin Schwidefsky, Heiko Carstens,
	David Rientjes

On 10/04/18 16:25, Laurent Dufour wrote:
> Remove the additional define HAVE_PTE_SPECIAL and rely directly on
> CONFIG_ARCH_HAS_PTE_SPECIAL.
> 
> There is no functional change introduced by this patch
> 
> Signed-off-by: Laurent Dufour <ldufour@linux.vnet.ibm.com>
> ---
>   mm/memory.c | 23 ++++++++++-------------
>   1 file changed, 10 insertions(+), 13 deletions(-)
> 
> diff --git a/mm/memory.c b/mm/memory.c
> index 96910c625daa..53b6344a90d2 100644
> --- a/mm/memory.c
> +++ b/mm/memory.c
> @@ -817,19 +817,13 @@ static void print_bad_pte(struct vm_area_struct *vma, unsigned long addr,
>    * PFNMAP mappings in order to support COWable mappings.
>    *
>    */
> -#ifdef CONFIG_ARCH_HAS_PTE_SPECIAL
> -# define HAVE_PTE_SPECIAL 1
> -#else
> -# define HAVE_PTE_SPECIAL 0
> -#endif
>   struct page *_vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
>   			     pte_t pte, bool with_public_device)
>   {
>   	unsigned long pfn = pte_pfn(pte);
>   
> -	if (HAVE_PTE_SPECIAL) {
> -		if (likely(!pte_special(pte)))
> -			goto check_pfn;
> +#ifdef CONFIG_ARCH_HAS_PTE_SPECIAL

Nit: Couldn't you use IS_ENABLED(CONFIG_ARCH_HAS_PTE_SPECIAL) within the 
existing code structure to avoid having to add these #ifdefs?

Robin.

> +	if (unlikely(pte_special(pte))) {
>   		if (vma->vm_ops && vma->vm_ops->find_special_page)
>   			return vma->vm_ops->find_special_page(vma, addr);
>   		if (vma->vm_flags & (VM_PFNMAP | VM_MIXEDMAP))
> @@ -862,7 +856,7 @@ struct page *_vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
>   		return NULL;
>   	}
>   
> -	/* !HAVE_PTE_SPECIAL case follows: */
> +#else	/* CONFIG_ARCH_HAS_PTE_SPECIAL */
>   
>   	if (unlikely(vma->vm_flags & (VM_PFNMAP|VM_MIXEDMAP))) {
>   		if (vma->vm_flags & VM_MIXEDMAP) {
> @@ -881,7 +875,8 @@ struct page *_vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
>   
>   	if (is_zero_pfn(pfn))
>   		return NULL;
> -check_pfn:
> +#endif /* CONFIG_ARCH_HAS_PTE_SPECIAL */
> +
>   	if (unlikely(pfn > highest_memmap_pfn)) {
>   		print_bad_pte(vma, addr, pte, NULL);
>   		return NULL;
> @@ -891,7 +886,7 @@ struct page *_vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
>   	 * NOTE! We still have PageReserved() pages in the page tables.
>   	 * eg. VDSO mappings can cause them to exist.
>   	 */
> -out:
> +out: __maybe_unused
>   	return pfn_to_page(pfn);
>   }
>   
> @@ -904,7 +899,7 @@ struct page *vm_normal_page_pmd(struct vm_area_struct *vma, unsigned long addr,
>   	/*
>   	 * There is no pmd_special() but there may be special pmds, e.g.
>   	 * in a direct-access (dax) mapping, so let's just replicate the
> -	 * !HAVE_PTE_SPECIAL case from vm_normal_page() here.
> +	 * !CONFIG_ARCH_HAS_PTE_SPECIAL case from vm_normal_page() here.
>   	 */
>   	if (unlikely(vma->vm_flags & (VM_PFNMAP|VM_MIXEDMAP))) {
>   		if (vma->vm_flags & VM_MIXEDMAP) {
> @@ -1926,6 +1921,7 @@ static int __vm_insert_mixed(struct vm_area_struct *vma, unsigned long addr,
>   
>   	track_pfn_insert(vma, &pgprot, pfn);
>   
> +#ifndef CONFIG_ARCH_HAS_PTE_SPECIAL
>   	/*
>   	 * If we don't have pte special, then we have to use the pfn_valid()
>   	 * based VM_MIXEDMAP scheme (see vm_normal_page), and thus we *must*
> @@ -1933,7 +1929,7 @@ static int __vm_insert_mixed(struct vm_area_struct *vma, unsigned long addr,
>   	 * than insert_pfn).  If a zero_pfn were inserted into a VM_MIXEDMAP
>   	 * without pte special, it would there be refcounted as a normal page.
>   	 */
> -	if (!HAVE_PTE_SPECIAL && !pfn_t_devmap(pfn) && pfn_t_valid(pfn)) {
> +	if (!pfn_t_devmap(pfn) && pfn_t_valid(pfn)) {
>   		struct page *page;
>   
>   		/*
> @@ -1944,6 +1940,7 @@ static int __vm_insert_mixed(struct vm_area_struct *vma, unsigned long addr,
>   		page = pfn_to_page(pfn_t_to_pfn(pfn));
>   		return insert_page(vma, addr, page, pgprot);
>   	}
> +#endif
>   	return insert_pfn(vma, addr, pfn, pgprot, mkwrite);
>   }
>   
> 
--
To unsubscribe from this list: send the line "unsubscribe linux-doc" in
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^ permalink raw reply	[flat|nested] 55+ messages in thread
* [PATCH v2 2/2] mm: remove odd HAVE_PTE_SPECIAL
@ 2018-04-10 15:58     ` Robin Murphy
  0 siblings, 0 replies; 55+ messages in thread
From: Robin Murphy @ 2018-04-10 15:58 UTC (permalink / raw)
  To: linux-riscv

On 10/04/18 16:25, Laurent Dufour wrote:
> Remove the additional define HAVE_PTE_SPECIAL and rely directly on
> CONFIG_ARCH_HAS_PTE_SPECIAL.
> 
> There is no functional change introduced by this patch
> 
> Signed-off-by: Laurent Dufour <ldufour@linux.vnet.ibm.com>
> ---
>   mm/memory.c | 23 ++++++++++-------------
>   1 file changed, 10 insertions(+), 13 deletions(-)
> 
> diff --git a/mm/memory.c b/mm/memory.c
> index 96910c625daa..53b6344a90d2 100644
> --- a/mm/memory.c
> +++ b/mm/memory.c
> @@ -817,19 +817,13 @@ static void print_bad_pte(struct vm_area_struct *vma, unsigned long addr,
>    * PFNMAP mappings in order to support COWable mappings.
>    *
>    */
> -#ifdef CONFIG_ARCH_HAS_PTE_SPECIAL
> -# define HAVE_PTE_SPECIAL 1
> -#else
> -# define HAVE_PTE_SPECIAL 0
> -#endif
>   struct page *_vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
>   			     pte_t pte, bool with_public_device)
>   {
>   	unsigned long pfn = pte_pfn(pte);
>   
> -	if (HAVE_PTE_SPECIAL) {
> -		if (likely(!pte_special(pte)))
> -			goto check_pfn;
> +#ifdef CONFIG_ARCH_HAS_PTE_SPECIAL

Nit: Couldn't you use IS_ENABLED(CONFIG_ARCH_HAS_PTE_SPECIAL) within the 
existing code structure to avoid having to add these #ifdefs?

Robin.

> +	if (unlikely(pte_special(pte))) {
>   		if (vma->vm_ops && vma->vm_ops->find_special_page)
>   			return vma->vm_ops->find_special_page(vma, addr);
>   		if (vma->vm_flags & (VM_PFNMAP | VM_MIXEDMAP))
> @@ -862,7 +856,7 @@ struct page *_vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
>   		return NULL;
>   	}
>   
> -	/* !HAVE_PTE_SPECIAL case follows: */
> +#else	/* CONFIG_ARCH_HAS_PTE_SPECIAL */
>   
>   	if (unlikely(vma->vm_flags & (VM_PFNMAP|VM_MIXEDMAP))) {
>   		if (vma->vm_flags & VM_MIXEDMAP) {
> @@ -881,7 +875,8 @@ struct page *_vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
>   
>   	if (is_zero_pfn(pfn))
>   		return NULL;
> -check_pfn:
> +#endif /* CONFIG_ARCH_HAS_PTE_SPECIAL */
> +
>   	if (unlikely(pfn > highest_memmap_pfn)) {
>   		print_bad_pte(vma, addr, pte, NULL);
>   		return NULL;
> @@ -891,7 +886,7 @@ struct page *_vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
>   	 * NOTE! We still have PageReserved() pages in the page tables.
>   	 * eg. VDSO mappings can cause them to exist.
>   	 */
> -out:
> +out: __maybe_unused
>   	return pfn_to_page(pfn);
>   }
>   
> @@ -904,7 +899,7 @@ struct page *vm_normal_page_pmd(struct vm_area_struct *vma, unsigned long addr,
>   	/*
>   	 * There is no pmd_special() but there may be special pmds, e.g.
>   	 * in a direct-access (dax) mapping, so let's just replicate the
> -	 * !HAVE_PTE_SPECIAL case from vm_normal_page() here.
> +	 * !CONFIG_ARCH_HAS_PTE_SPECIAL case from vm_normal_page() here.
>   	 */
>   	if (unlikely(vma->vm_flags & (VM_PFNMAP|VM_MIXEDMAP))) {
>   		if (vma->vm_flags & VM_MIXEDMAP) {
> @@ -1926,6 +1921,7 @@ static int __vm_insert_mixed(struct vm_area_struct *vma, unsigned long addr,
>   
>   	track_pfn_insert(vma, &pgprot, pfn);
>   
> +#ifndef CONFIG_ARCH_HAS_PTE_SPECIAL
>   	/*
>   	 * If we don't have pte special, then we have to use the pfn_valid()
>   	 * based VM_MIXEDMAP scheme (see vm_normal_page), and thus we *must*
> @@ -1933,7 +1929,7 @@ static int __vm_insert_mixed(struct vm_area_struct *vma, unsigned long addr,
>   	 * than insert_pfn).  If a zero_pfn were inserted into a VM_MIXEDMAP
>   	 * without pte special, it would there be refcounted as a normal page.
>   	 */
> -	if (!HAVE_PTE_SPECIAL && !pfn_t_devmap(pfn) && pfn_t_valid(pfn)) {
> +	if (!pfn_t_devmap(pfn) && pfn_t_valid(pfn)) {
>   		struct page *page;
>   
>   		/*
> @@ -1944,6 +1940,7 @@ static int __vm_insert_mixed(struct vm_area_struct *vma, unsigned long addr,
>   		page = pfn_to_page(pfn_t_to_pfn(pfn));
>   		return insert_page(vma, addr, page, pgprot);
>   	}
> +#endif
>   	return insert_pfn(vma, addr, pfn, pgprot, mkwrite);
>   }
>   
> 

^ permalink raw reply	[flat|nested] 55+ messages in thread
* [PATCH v2 2/2] mm: remove odd HAVE_PTE_SPECIAL
@ 2018-04-10 15:58     ` Robin Murphy
  0 siblings, 0 replies; 55+ messages in thread
From: Robin Murphy @ 2018-04-10 15:58 UTC (permalink / raw)
  To: linux-snps-arc

On 10/04/18 16:25, Laurent Dufour wrote:
> Remove the additional define HAVE_PTE_SPECIAL and rely directly on
> CONFIG_ARCH_HAS_PTE_SPECIAL.
> 
> There is no functional change introduced by this patch
> 
> Signed-off-by: Laurent Dufour <ldufour at linux.vnet.ibm.com>
> ---
>   mm/memory.c | 23 ++++++++++-------------
>   1 file changed, 10 insertions(+), 13 deletions(-)
> 
> diff --git a/mm/memory.c b/mm/memory.c
> index 96910c625daa..53b6344a90d2 100644
> --- a/mm/memory.c
> +++ b/mm/memory.c
> @@ -817,19 +817,13 @@ static void print_bad_pte(struct vm_area_struct *vma, unsigned long addr,
>    * PFNMAP mappings in order to support COWable mappings.
>    *
>    */
> -#ifdef CONFIG_ARCH_HAS_PTE_SPECIAL
> -# define HAVE_PTE_SPECIAL 1
> -#else
> -# define HAVE_PTE_SPECIAL 0
> -#endif
>   struct page *_vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
>   			     pte_t pte, bool with_public_device)
>   {
>   	unsigned long pfn = pte_pfn(pte);
>   
> -	if (HAVE_PTE_SPECIAL) {
> -		if (likely(!pte_special(pte)))
> -			goto check_pfn;
> +#ifdef CONFIG_ARCH_HAS_PTE_SPECIAL

Nit: Couldn't you use IS_ENABLED(CONFIG_ARCH_HAS_PTE_SPECIAL) within the 
existing code structure to avoid having to add these #ifdefs?

Robin.

> +	if (unlikely(pte_special(pte))) {
>   		if (vma->vm_ops && vma->vm_ops->find_special_page)
>   			return vma->vm_ops->find_special_page(vma, addr);
>   		if (vma->vm_flags & (VM_PFNMAP | VM_MIXEDMAP))
> @@ -862,7 +856,7 @@ struct page *_vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
>   		return NULL;
>   	}
>   
> -	/* !HAVE_PTE_SPECIAL case follows: */
> +#else	/* CONFIG_ARCH_HAS_PTE_SPECIAL */
>   
>   	if (unlikely(vma->vm_flags & (VM_PFNMAP|VM_MIXEDMAP))) {
>   		if (vma->vm_flags & VM_MIXEDMAP) {
> @@ -881,7 +875,8 @@ struct page *_vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
>   
>   	if (is_zero_pfn(pfn))
>   		return NULL;
> -check_pfn:
> +#endif /* CONFIG_ARCH_HAS_PTE_SPECIAL */
> +
>   	if (unlikely(pfn > highest_memmap_pfn)) {
>   		print_bad_pte(vma, addr, pte, NULL);
>   		return NULL;
> @@ -891,7 +886,7 @@ struct page *_vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
>   	 * NOTE! We still have PageReserved() pages in the page tables.
>   	 * eg. VDSO mappings can cause them to exist.
>   	 */
> -out:
> +out: __maybe_unused
>   	return pfn_to_page(pfn);
>   }
>   
> @@ -904,7 +899,7 @@ struct page *vm_normal_page_pmd(struct vm_area_struct *vma, unsigned long addr,
>   	/*
>   	 * There is no pmd_special() but there may be special pmds, e.g.
>   	 * in a direct-access (dax) mapping, so let's just replicate the
> -	 * !HAVE_PTE_SPECIAL case from vm_normal_page() here.
> +	 * !CONFIG_ARCH_HAS_PTE_SPECIAL case from vm_normal_page() here.
>   	 */
>   	if (unlikely(vma->vm_flags & (VM_PFNMAP|VM_MIXEDMAP))) {
>   		if (vma->vm_flags & VM_MIXEDMAP) {
> @@ -1926,6 +1921,7 @@ static int __vm_insert_mixed(struct vm_area_struct *vma, unsigned long addr,
>   
>   	track_pfn_insert(vma, &pgprot, pfn);
>   
> +#ifndef CONFIG_ARCH_HAS_PTE_SPECIAL
>   	/*
>   	 * If we don't have pte special, then we have to use the pfn_valid()
>   	 * based VM_MIXEDMAP scheme (see vm_normal_page), and thus we *must*
> @@ -1933,7 +1929,7 @@ static int __vm_insert_mixed(struct vm_area_struct *vma, unsigned long addr,
>   	 * than insert_pfn).  If a zero_pfn were inserted into a VM_MIXEDMAP
>   	 * without pte special, it would there be refcounted as a normal page.
>   	 */
> -	if (!HAVE_PTE_SPECIAL && !pfn_t_devmap(pfn) && pfn_t_valid(pfn)) {
> +	if (!pfn_t_devmap(pfn) && pfn_t_valid(pfn)) {
>   		struct page *page;
>   
>   		/*
> @@ -1944,6 +1940,7 @@ static int __vm_insert_mixed(struct vm_area_struct *vma, unsigned long addr,
>   		page = pfn_to_page(pfn_t_to_pfn(pfn));
>   		return insert_page(vma, addr, page, pgprot);
>   	}
> +#endif
>   	return insert_pfn(vma, addr, pfn, pgprot, mkwrite);
>   }
>   
> 

^ permalink raw reply	[flat|nested] 55+ messages in thread
* [PATCH v2 2/2] mm: remove odd HAVE_PTE_SPECIAL
@ 2018-04-10 15:58     ` Robin Murphy
  0 siblings, 0 replies; 55+ messages in thread
From: Robin Murphy @ 2018-04-10 15:58 UTC (permalink / raw)
  To: linux-arm-kernel

On 10/04/18 16:25, Laurent Dufour wrote:
> Remove the additional define HAVE_PTE_SPECIAL and rely directly on
> CONFIG_ARCH_HAS_PTE_SPECIAL.
> 
> There is no functional change introduced by this patch
> 
> Signed-off-by: Laurent Dufour <ldufour@linux.vnet.ibm.com>
> ---
>   mm/memory.c | 23 ++++++++++-------------
>   1 file changed, 10 insertions(+), 13 deletions(-)
> 
> diff --git a/mm/memory.c b/mm/memory.c
> index 96910c625daa..53b6344a90d2 100644
> --- a/mm/memory.c
> +++ b/mm/memory.c
> @@ -817,19 +817,13 @@ static void print_bad_pte(struct vm_area_struct *vma, unsigned long addr,
>    * PFNMAP mappings in order to support COWable mappings.
>    *
>    */
> -#ifdef CONFIG_ARCH_HAS_PTE_SPECIAL
> -# define HAVE_PTE_SPECIAL 1
> -#else
> -# define HAVE_PTE_SPECIAL 0
> -#endif
>   struct page *_vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
>   			     pte_t pte, bool with_public_device)
>   {
>   	unsigned long pfn = pte_pfn(pte);
>   
> -	if (HAVE_PTE_SPECIAL) {
> -		if (likely(!pte_special(pte)))
> -			goto check_pfn;
> +#ifdef CONFIG_ARCH_HAS_PTE_SPECIAL

Nit: Couldn't you use IS_ENABLED(CONFIG_ARCH_HAS_PTE_SPECIAL) within the 
existing code structure to avoid having to add these #ifdefs?

Robin.

> +	if (unlikely(pte_special(pte))) {
>   		if (vma->vm_ops && vma->vm_ops->find_special_page)
>   			return vma->vm_ops->find_special_page(vma, addr);
>   		if (vma->vm_flags & (VM_PFNMAP | VM_MIXEDMAP))
> @@ -862,7 +856,7 @@ struct page *_vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
>   		return NULL;
>   	}
>   
> -	/* !HAVE_PTE_SPECIAL case follows: */
> +#else	/* CONFIG_ARCH_HAS_PTE_SPECIAL */
>   
>   	if (unlikely(vma->vm_flags & (VM_PFNMAP|VM_MIXEDMAP))) {
>   		if (vma->vm_flags & VM_MIXEDMAP) {
> @@ -881,7 +875,8 @@ struct page *_vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
>   
>   	if (is_zero_pfn(pfn))
>   		return NULL;
> -check_pfn:
> +#endif /* CONFIG_ARCH_HAS_PTE_SPECIAL */
> +
>   	if (unlikely(pfn > highest_memmap_pfn)) {
>   		print_bad_pte(vma, addr, pte, NULL);
>   		return NULL;
> @@ -891,7 +886,7 @@ struct page *_vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
>   	 * NOTE! We still have PageReserved() pages in the page tables.
>   	 * eg. VDSO mappings can cause them to exist.
>   	 */
> -out:
> +out: __maybe_unused
>   	return pfn_to_page(pfn);
>   }
>   
> @@ -904,7 +899,7 @@ struct page *vm_normal_page_pmd(struct vm_area_struct *vma, unsigned long addr,
>   	/*
>   	 * There is no pmd_special() but there may be special pmds, e.g.
>   	 * in a direct-access (dax) mapping, so let's just replicate the
> -	 * !HAVE_PTE_SPECIAL case from vm_normal_page() here.
> +	 * !CONFIG_ARCH_HAS_PTE_SPECIAL case from vm_normal_page() here.
>   	 */
>   	if (unlikely(vma->vm_flags & (VM_PFNMAP|VM_MIXEDMAP))) {
>   		if (vma->vm_flags & VM_MIXEDMAP) {
> @@ -1926,6 +1921,7 @@ static int __vm_insert_mixed(struct vm_area_struct *vma, unsigned long addr,
>   
>   	track_pfn_insert(vma, &pgprot, pfn);
>   
> +#ifndef CONFIG_ARCH_HAS_PTE_SPECIAL
>   	/*
>   	 * If we don't have pte special, then we have to use the pfn_valid()
>   	 * based VM_MIXEDMAP scheme (see vm_normal_page), and thus we *must*
> @@ -1933,7 +1929,7 @@ static int __vm_insert_mixed(struct vm_area_struct *vma, unsigned long addr,
>   	 * than insert_pfn).  If a zero_pfn were inserted into a VM_MIXEDMAP
>   	 * without pte special, it would there be refcounted as a normal page.
>   	 */
> -	if (!HAVE_PTE_SPECIAL && !pfn_t_devmap(pfn) && pfn_t_valid(pfn)) {
> +	if (!pfn_t_devmap(pfn) && pfn_t_valid(pfn)) {
>   		struct page *page;
>   
>   		/*
> @@ -1944,6 +1940,7 @@ static int __vm_insert_mixed(struct vm_area_struct *vma, unsigned long addr,
>   		page = pfn_to_page(pfn_t_to_pfn(pfn));
>   		return insert_page(vma, addr, page, pgprot);
>   	}
> +#endif
>   	return insert_pfn(vma, addr, pfn, pgprot, mkwrite);
>   }
>   
> 

^ permalink raw reply	[flat|nested] 55+ messages in thread
* Re: [PATCH v2 1/2] mm: introduce ARCH_HAS_PTE_SPECIAL
  2018-04-10 15:25   ` Laurent Dufour
                       ` (3 preceding siblings ...)
  (?)
@ 2018-04-10 16:09     ` Matthew Wilcox
  -1 siblings, 0 replies; 55+ messages in thread
From: Matthew Wilcox @ 2018-04-10 16:09 UTC (permalink / raw)
  To: linux-arm-kernel

On Tue, Apr 10, 2018 at 05:25:50PM +0200, Laurent Dufour wrote:
>  arch/powerpc/include/asm/pte-common.h                  | 3 ---
>  arch/riscv/Kconfig                                     | 1 +
>  arch/s390/Kconfig                                      | 1 +

You forgot to delete __HAVE_ARCH_PTE_SPECIAL from
arch/riscv/include/asm/pgtable-bits.h

^ permalink raw reply	[flat|nested] 55+ messages in thread
* Re: [PATCH v2 1/2] mm: introduce ARCH_HAS_PTE_SPECIAL
@ 2018-04-10 16:09     ` Matthew Wilcox
  0 siblings, 0 replies; 55+ messages in thread
From: Matthew Wilcox @ 2018-04-10 16:09 UTC (permalink / raw)
  To: Laurent Dufour
  Cc: linux-kernel, linux-mm, linuxppc-dev, x86, linux-doc,
	linux-snps-arc, linux-arm-kernel, linux-riscv, linux-s390,
	linux-sh, sparclinux, Jerome Glisse, mhocko, aneesh.kumar, akpm,
	mpe, benh, paulus, Jonathan Corbet, Catalin Marinas, Will Deacon,
	Yoshinori Sato, Rich Felker, David S . Miller, Thomas Gleixner,
	Ingo Molnar, Vineet Gupta, Palmer Dabbelt, Albert Ou,
	Martin Schwidefsky, Heiko Carstens, David Rientjes

On Tue, Apr 10, 2018 at 05:25:50PM +0200, Laurent Dufour wrote:
>  arch/powerpc/include/asm/pte-common.h                  | 3 ---
>  arch/riscv/Kconfig                                     | 1 +
>  arch/s390/Kconfig                                      | 1 +

You forgot to delete __HAVE_ARCH_PTE_SPECIAL from
arch/riscv/include/asm/pgtable-bits.h

^ permalink raw reply	[flat|nested] 55+ messages in thread
* Re: [PATCH v2 1/2] mm: introduce ARCH_HAS_PTE_SPECIAL
@ 2018-04-10 16:09     ` Matthew Wilcox
  0 siblings, 0 replies; 55+ messages in thread
From: Matthew Wilcox @ 2018-04-10 16:09 UTC (permalink / raw)
  To: Laurent Dufour
  Cc: linux-kernel, linux-mm, linuxppc-dev, x86, linux-doc,
	linux-snps-arc, linux-arm-kernel, linux-riscv, linux-s390,
	linux-sh, sparclinux, Jerome Glisse, mhocko, aneesh.kumar, akpm,
	mpe, benh, paulus, Jonathan Corbet, Catalin Marinas, Will Deacon,
	Yoshinori Sato, Rich Felker, David S . Miller, Thomas Gleixner,
	Ingo Molnar, Vineet Gupta, Palmer Dabbelt, Albert Ou,
	Martin Schwidefsky, Heiko Carstens, David Rientjes

On Tue, Apr 10, 2018 at 05:25:50PM +0200, Laurent Dufour wrote:
>  arch/powerpc/include/asm/pte-common.h                  | 3 ---
>  arch/riscv/Kconfig                                     | 1 +
>  arch/s390/Kconfig                                      | 1 +

You forgot to delete __HAVE_ARCH_PTE_SPECIAL from
arch/riscv/include/asm/pgtable-bits.h
--
To unsubscribe from this list: send the line "unsubscribe linux-doc" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html

^ permalink raw reply	[flat|nested] 55+ messages in thread
* [PATCH v2 1/2] mm: introduce ARCH_HAS_PTE_SPECIAL
@ 2018-04-10 16:09     ` Matthew Wilcox
  0 siblings, 0 replies; 55+ messages in thread
From: Matthew Wilcox @ 2018-04-10 16:09 UTC (permalink / raw)
  To: linux-riscv

On Tue, Apr 10, 2018 at 05:25:50PM +0200, Laurent Dufour wrote:
>  arch/powerpc/include/asm/pte-common.h                  | 3 ---
>  arch/riscv/Kconfig                                     | 1 +
>  arch/s390/Kconfig                                      | 1 +

You forgot to delete __HAVE_ARCH_PTE_SPECIAL from
arch/riscv/include/asm/pgtable-bits.h

^ permalink raw reply	[flat|nested] 55+ messages in thread
* [PATCH v2 1/2] mm: introduce ARCH_HAS_PTE_SPECIAL
@ 2018-04-10 16:09     ` Matthew Wilcox
  0 siblings, 0 replies; 55+ messages in thread
From: Matthew Wilcox @ 2018-04-10 16:09 UTC (permalink / raw)
  To: linux-snps-arc

On Tue, Apr 10, 2018@05:25:50PM +0200, Laurent Dufour wrote:
>  arch/powerpc/include/asm/pte-common.h                  | 3 ---
>  arch/riscv/Kconfig                                     | 1 +
>  arch/s390/Kconfig                                      | 1 +

You forgot to delete __HAVE_ARCH_PTE_SPECIAL from
arch/riscv/include/asm/pgtable-bits.h

^ permalink raw reply	[flat|nested] 55+ messages in thread
* [PATCH v2 1/2] mm: introduce ARCH_HAS_PTE_SPECIAL
@ 2018-04-10 16:09     ` Matthew Wilcox
  0 siblings, 0 replies; 55+ messages in thread
From: Matthew Wilcox @ 2018-04-10 16:09 UTC (permalink / raw)
  To: linux-arm-kernel

On Tue, Apr 10, 2018 at 05:25:50PM +0200, Laurent Dufour wrote:
>  arch/powerpc/include/asm/pte-common.h                  | 3 ---
>  arch/riscv/Kconfig                                     | 1 +
>  arch/s390/Kconfig                                      | 1 +

You forgot to delete __HAVE_ARCH_PTE_SPECIAL from
arch/riscv/include/asm/pgtable-bits.h

^ permalink raw reply	[flat|nested] 55+ messages in thread
* Re: [PATCH v2 1/2] mm: introduce ARCH_HAS_PTE_SPECIAL
  2018-04-10 16:09     ` Matthew Wilcox
                         ` (3 preceding siblings ...)
  (?)
@ 2018-04-10 16:42       ` Laurent Dufour
  -1 siblings, 0 replies; 55+ messages in thread
From: Laurent Dufour @ 2018-04-10 16:42 UTC (permalink / raw)
  To: linux-arm-kernel

On 10/04/2018 18:09, Matthew Wilcox wrote:
> On Tue, Apr 10, 2018 at 05:25:50PM +0200, Laurent Dufour wrote:
>>  arch/powerpc/include/asm/pte-common.h                  | 3 ---
>>  arch/riscv/Kconfig                                     | 1 +
>>  arch/s390/Kconfig                                      | 1 +
> 
> You forgot to delete __HAVE_ARCH_PTE_SPECIAL from
> arch/riscv/include/asm/pgtable-bits.h

Damned !
Thanks for catching it.


^ permalink raw reply	[flat|nested] 55+ messages in thread
* Re: [PATCH v2 1/2] mm: introduce ARCH_HAS_PTE_SPECIAL
@ 2018-04-10 16:42       ` Laurent Dufour
  0 siblings, 0 replies; 55+ messages in thread
From: Laurent Dufour @ 2018-04-10 16:42 UTC (permalink / raw)
  To: Matthew Wilcox
  Cc: linux-kernel, linux-mm, linuxppc-dev, x86, linux-doc,
	linux-snps-arc, linux-arm-kernel, linux-riscv, linux-s390,
	linux-sh, sparclinux, Jerome Glisse, mhocko, aneesh.kumar, akpm,
	mpe, benh, paulus, Jonathan Corbet, Catalin Marinas, Will Deacon,
	Yoshinori Sato, Rich Felker, David S . Miller, Thomas Gleixner,
	Ingo Molnar, Vineet Gupta, Palmer Dabbelt, Albert Ou,
	Martin Schwidefsky, Heiko Carstens, David Rientjes

On 10/04/2018 18:09, Matthew Wilcox wrote:
> On Tue, Apr 10, 2018 at 05:25:50PM +0200, Laurent Dufour wrote:
>>  arch/powerpc/include/asm/pte-common.h                  | 3 ---
>>  arch/riscv/Kconfig                                     | 1 +
>>  arch/s390/Kconfig                                      | 1 +
> 
> You forgot to delete __HAVE_ARCH_PTE_SPECIAL from
> arch/riscv/include/asm/pgtable-bits.h

Damned !
Thanks for catching it.

^ permalink raw reply	[flat|nested] 55+ messages in thread
* Re: [PATCH v2 1/2] mm: introduce ARCH_HAS_PTE_SPECIAL
@ 2018-04-10 16:42       ` Laurent Dufour
  0 siblings, 0 replies; 55+ messages in thread
From: Laurent Dufour @ 2018-04-10 16:42 UTC (permalink / raw)
  To: Matthew Wilcox
  Cc: linux-kernel, linux-mm, linuxppc-dev, x86, linux-doc,
	linux-snps-arc, linux-arm-kernel, linux-riscv, linux-s390,
	linux-sh, sparclinux, Jerome Glisse, mhocko, aneesh.kumar, akpm,
	mpe, benh, paulus, Jonathan Corbet, Catalin Marinas, Will Deacon,
	Yoshinori Sato, Rich Felker, David S . Miller, Thomas Gleixner,
	Ingo Molnar, Vineet Gupta, Palmer Dabbelt, Albert Ou,
	Martin Schwidefsky, Heiko Carstens, David Rientjes

On 10/04/2018 18:09, Matthew Wilcox wrote:
> On Tue, Apr 10, 2018 at 05:25:50PM +0200, Laurent Dufour wrote:
>>  arch/powerpc/include/asm/pte-common.h                  | 3 ---
>>  arch/riscv/Kconfig                                     | 1 +
>>  arch/s390/Kconfig                                      | 1 +
> 
> You forgot to delete __HAVE_ARCH_PTE_SPECIAL from
> arch/riscv/include/asm/pgtable-bits.h

Damned !
Thanks for catching it.

--
To unsubscribe from this list: send the line "unsubscribe linux-doc" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html

^ permalink raw reply	[flat|nested] 55+ messages in thread
* [PATCH v2 1/2] mm: introduce ARCH_HAS_PTE_SPECIAL
@ 2018-04-10 16:42       ` Laurent Dufour
  0 siblings, 0 replies; 55+ messages in thread
From: Laurent Dufour @ 2018-04-10 16:42 UTC (permalink / raw)
  To: linux-riscv

On 10/04/2018 18:09, Matthew Wilcox wrote:
> On Tue, Apr 10, 2018 at 05:25:50PM +0200, Laurent Dufour wrote:
>>  arch/powerpc/include/asm/pte-common.h                  | 3 ---
>>  arch/riscv/Kconfig                                     | 1 +
>>  arch/s390/Kconfig                                      | 1 +
> 
> You forgot to delete __HAVE_ARCH_PTE_SPECIAL from
> arch/riscv/include/asm/pgtable-bits.h

Damned !
Thanks for catching it.

^ permalink raw reply	[flat|nested] 55+ messages in thread
* [PATCH v2 1/2] mm: introduce ARCH_HAS_PTE_SPECIAL
@ 2018-04-10 16:42       ` Laurent Dufour
  0 siblings, 0 replies; 55+ messages in thread
From: Laurent Dufour @ 2018-04-10 16:42 UTC (permalink / raw)
  To: linux-snps-arc

On 10/04/2018 18:09, Matthew Wilcox wrote:
> On Tue, Apr 10, 2018@05:25:50PM +0200, Laurent Dufour wrote:
>>  arch/powerpc/include/asm/pte-common.h                  | 3 ---
>>  arch/riscv/Kconfig                                     | 1 +
>>  arch/s390/Kconfig                                      | 1 +
> 
> You forgot to delete __HAVE_ARCH_PTE_SPECIAL from
> arch/riscv/include/asm/pgtable-bits.h

Damned !
Thanks for catching it.

^ permalink raw reply	[flat|nested] 55+ messages in thread
* [PATCH v2 1/2] mm: introduce ARCH_HAS_PTE_SPECIAL
@ 2018-04-10 16:42       ` Laurent Dufour
  0 siblings, 0 replies; 55+ messages in thread
From: Laurent Dufour @ 2018-04-10 16:42 UTC (permalink / raw)
  To: linux-arm-kernel

On 10/04/2018 18:09, Matthew Wilcox wrote:
> On Tue, Apr 10, 2018 at 05:25:50PM +0200, Laurent Dufour wrote:
>>  arch/powerpc/include/asm/pte-common.h                  | 3 ---
>>  arch/riscv/Kconfig                                     | 1 +
>>  arch/s390/Kconfig                                      | 1 +
> 
> You forgot to delete __HAVE_ARCH_PTE_SPECIAL from
> arch/riscv/include/asm/pgtable-bits.h

Damned !
Thanks for catching it.

^ permalink raw reply	[flat|nested] 55+ messages in thread
* Re: [PATCH v2 2/2] mm: remove odd HAVE_PTE_SPECIAL
  2018-04-10 15:58     ` Robin Murphy
                         ` (4 preceding siblings ...)
  (?)
@ 2018-04-10 16:44       ` Laurent Dufour
  -1 siblings, 0 replies; 55+ messages in thread
From: Laurent Dufour @ 2018-04-10 16:44 UTC (permalink / raw)
  To: linux-arm-kernel



On 10/04/2018 17:58, Robin Murphy wrote:
> On 10/04/18 16:25, Laurent Dufour wrote:
>> Remove the additional define HAVE_PTE_SPECIAL and rely directly on
>> CONFIG_ARCH_HAS_PTE_SPECIAL.
>>
>> There is no functional change introduced by this patch
>>
>> Signed-off-by: Laurent Dufour <ldufour@linux.vnet.ibm.com>
>> ---
>>   mm/memory.c | 23 ++++++++++-------------
>>   1 file changed, 10 insertions(+), 13 deletions(-)
>>
>> diff --git a/mm/memory.c b/mm/memory.c
>> index 96910c625daa..53b6344a90d2 100644
>> --- a/mm/memory.c
>> +++ b/mm/memory.c
>> @@ -817,19 +817,13 @@ static void print_bad_pte(struct vm_area_struct *vma,
>> unsigned long addr,
>>    * PFNMAP mappings in order to support COWable mappings.
>>    *
>>    */
>> -#ifdef CONFIG_ARCH_HAS_PTE_SPECIAL
>> -# define HAVE_PTE_SPECIAL 1
>> -#else
>> -# define HAVE_PTE_SPECIAL 0
>> -#endif
>>   struct page *_vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
>>                    pte_t pte, bool with_public_device)
>>   {
>>       unsigned long pfn = pte_pfn(pte);
>>   -    if (HAVE_PTE_SPECIAL) {
>> -        if (likely(!pte_special(pte)))
>> -            goto check_pfn;
>> +#ifdef CONFIG_ARCH_HAS_PTE_SPECIAL
> 
> Nit: Couldn't you use IS_ENABLED(CONFIG_ARCH_HAS_PTE_SPECIAL) within the
> existing code structure to avoid having to add these #ifdefs?

I agree, that would be better. I didn't thought about this option..
Thanks for reporting this.


^ permalink raw reply	[flat|nested] 55+ messages in thread
* Re: [PATCH v2 2/2] mm: remove odd HAVE_PTE_SPECIAL
@ 2018-04-10 16:44       ` Laurent Dufour
  0 siblings, 0 replies; 55+ messages in thread
From: Laurent Dufour @ 2018-04-10 16:44 UTC (permalink / raw)
  To: Robin Murphy, linux-kernel, linux-mm, linuxppc-dev, x86,
	linux-doc, linux-snps-arc, linux-arm-kernel, linux-riscv,
	linux-s390, linux-sh, sparclinux, Jerome Glisse, mhocko,
	aneesh.kumar, akpm, mpe, benh, paulus, Jonathan Corbet,
	Catalin Marinas, Will Deacon, Yoshinori Sato, Rich Felker,
	David S . Miller, Thomas Gleixner, Ingo Molnar, Vineet Gupta,
	Palmer Dabbelt, Albert Ou, Martin Schwidefsky, Heiko Carstens,
	David Rientjes



On 10/04/2018 17:58, Robin Murphy wrote:
> On 10/04/18 16:25, Laurent Dufour wrote:
>> Remove the additional define HAVE_PTE_SPECIAL and rely directly on
>> CONFIG_ARCH_HAS_PTE_SPECIAL.
>>
>> There is no functional change introduced by this patch
>>
>> Signed-off-by: Laurent Dufour <ldufour@linux.vnet.ibm.com>
>> ---
>>   mm/memory.c | 23 ++++++++++-------------
>>   1 file changed, 10 insertions(+), 13 deletions(-)
>>
>> diff --git a/mm/memory.c b/mm/memory.c
>> index 96910c625daa..53b6344a90d2 100644
>> --- a/mm/memory.c
>> +++ b/mm/memory.c
>> @@ -817,19 +817,13 @@ static void print_bad_pte(struct vm_area_struct *vma,
>> unsigned long addr,
>>    * PFNMAP mappings in order to support COWable mappings.
>>    *
>>    */
>> -#ifdef CONFIG_ARCH_HAS_PTE_SPECIAL
>> -# define HAVE_PTE_SPECIAL 1
>> -#else
>> -# define HAVE_PTE_SPECIAL 0
>> -#endif
>>   struct page *_vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
>>                    pte_t pte, bool with_public_device)
>>   {
>>       unsigned long pfn = pte_pfn(pte);
>>   -    if (HAVE_PTE_SPECIAL) {
>> -        if (likely(!pte_special(pte)))
>> -            goto check_pfn;
>> +#ifdef CONFIG_ARCH_HAS_PTE_SPECIAL
> 
> Nit: Couldn't you use IS_ENABLED(CONFIG_ARCH_HAS_PTE_SPECIAL) within the
> existing code structure to avoid having to add these #ifdefs?

I agree, that would be better. I didn't thought about this option..
Thanks for reporting this.

^ permalink raw reply	[flat|nested] 55+ messages in thread
* Re: [PATCH v2 2/2] mm: remove odd HAVE_PTE_SPECIAL
@ 2018-04-10 16:44       ` Laurent Dufour
  0 siblings, 0 replies; 55+ messages in thread
From: Laurent Dufour @ 2018-04-10 16:44 UTC (permalink / raw)
  To: Robin Murphy, linux-kernel, linux-mm, linuxppc-dev, x86,
	linux-doc, linux-snps-arc, linux-arm-kernel, linux-riscv,
	linux-s390, linux-sh, sparclinux, Jerome Glisse, mhocko,
	aneesh.kumar, akpm, mpe, benh, paulus, Jonathan Corbet,
	Catalin Marinas, Will Deacon, Yoshinori Sato, Rich Felker,
	David S . Miller, Thomas Gleixner, Ingo Molnar, Vineet Gupta,
	Palmer Dabbelt, Albert Ou, Martin Schwidefsky, Heiko Carstens,
	David Rientjes



On 10/04/2018 17:58, Robin Murphy wrote:
> On 10/04/18 16:25, Laurent Dufour wrote:
>> Remove the additional define HAVE_PTE_SPECIAL and rely directly on
>> CONFIG_ARCH_HAS_PTE_SPECIAL.
>>
>> There is no functional change introduced by this patch
>>
>> Signed-off-by: Laurent Dufour <ldufour@linux.vnet.ibm.com>
>> ---
>>   mm/memory.c | 23 ++++++++++-------------
>>   1 file changed, 10 insertions(+), 13 deletions(-)
>>
>> diff --git a/mm/memory.c b/mm/memory.c
>> index 96910c625daa..53b6344a90d2 100644
>> --- a/mm/memory.c
>> +++ b/mm/memory.c
>> @@ -817,19 +817,13 @@ static void print_bad_pte(struct vm_area_struct *vma,
>> unsigned long addr,
>>    * PFNMAP mappings in order to support COWable mappings.
>>    *
>>    */
>> -#ifdef CONFIG_ARCH_HAS_PTE_SPECIAL
>> -# define HAVE_PTE_SPECIAL 1
>> -#else
>> -# define HAVE_PTE_SPECIAL 0
>> -#endif
>>   struct page *_vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
>>                    pte_t pte, bool with_public_device)
>>   {
>>       unsigned long pfn = pte_pfn(pte);
>>   -    if (HAVE_PTE_SPECIAL) {
>> -        if (likely(!pte_special(pte)))
>> -            goto check_pfn;
>> +#ifdef CONFIG_ARCH_HAS_PTE_SPECIAL
> 
> Nit: Couldn't you use IS_ENABLED(CONFIG_ARCH_HAS_PTE_SPECIAL) within the
> existing code structure to avoid having to add these #ifdefs?

I agree, that would be better. I didn't thought about this option..
Thanks for reporting this.

--
To unsubscribe from this list: send the line "unsubscribe linux-doc" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html

^ permalink raw reply	[flat|nested] 55+ messages in thread
* [PATCH v2 2/2] mm: remove odd HAVE_PTE_SPECIAL
@ 2018-04-10 16:44       ` Laurent Dufour
  0 siblings, 0 replies; 55+ messages in thread
From: Laurent Dufour @ 2018-04-10 16:44 UTC (permalink / raw)
  To: linux-riscv



On 10/04/2018 17:58, Robin Murphy wrote:
> On 10/04/18 16:25, Laurent Dufour wrote:
>> Remove the additional define HAVE_PTE_SPECIAL and rely directly on
>> CONFIG_ARCH_HAS_PTE_SPECIAL.
>>
>> There is no functional change introduced by this patch
>>
>> Signed-off-by: Laurent Dufour <ldufour@linux.vnet.ibm.com>
>> ---
>> ? mm/memory.c | 23 ++++++++++-------------
>> ? 1 file changed, 10 insertions(+), 13 deletions(-)
>>
>> diff --git a/mm/memory.c b/mm/memory.c
>> index 96910c625daa..53b6344a90d2 100644
>> --- a/mm/memory.c
>> +++ b/mm/memory.c
>> @@ -817,19 +817,13 @@ static void print_bad_pte(struct vm_area_struct *vma,
>> unsigned long addr,
>> ?? * PFNMAP mappings in order to support COWable mappings.
>> ?? *
>> ?? */
>> -#ifdef CONFIG_ARCH_HAS_PTE_SPECIAL
>> -# define HAVE_PTE_SPECIAL 1
>> -#else
>> -# define HAVE_PTE_SPECIAL 0
>> -#endif
>> ? struct page *_vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
>> ?????????????????? pte_t pte, bool with_public_device)
>> ? {
>> ????? unsigned long pfn = pte_pfn(pte);
>> ? -??? if (HAVE_PTE_SPECIAL) {
>> -??????? if (likely(!pte_special(pte)))
>> -??????????? goto check_pfn;
>> +#ifdef CONFIG_ARCH_HAS_PTE_SPECIAL
> 
> Nit: Couldn't you use IS_ENABLED(CONFIG_ARCH_HAS_PTE_SPECIAL) within the
> existing code structure to avoid having to add these #ifdefs?

I agree, that would be better. I didn't thought about this option..
Thanks for reporting this.

^ permalink raw reply	[flat|nested] 55+ messages in thread
* Re: [PATCH v2 2/2] mm: remove odd HAVE_PTE_SPECIAL
@ 2018-04-10 16:44       ` Laurent Dufour
  0 siblings, 0 replies; 55+ messages in thread
From: Laurent Dufour @ 2018-04-10 16:44 UTC (permalink / raw)
  To: Robin Murphy, linux-kernel, linux-mm, linuxppc-dev, x86,
	linux-doc, linux-snps-arc, linux-arm-kernel, linux-riscv,
	linux-s390, linux-sh, sparclinux, Jerome Glisse, mhocko,
	aneesh.kumar, akpm, mpe, benh, paulus, Jonathan Corbet,
	Catalin Marinas, Will Deacon, Yoshinori Sato, Rich Felker,
	David S . Miller, Thomas Gleixner, Ingo Molnar, Vineet Gupta,
	Palmer Dabbelt, Albert Ou, Martin Schwidefsky, Heiko Carstens,
	David Rientjes



On 10/04/2018 17:58, Robin Murphy wrote:
> On 10/04/18 16:25, Laurent Dufour wrote:
>> Remove the additional define HAVE_PTE_SPECIAL and rely directly on
>> CONFIG_ARCH_HAS_PTE_SPECIAL.
>>
>> There is no functional change introduced by this patch
>>
>> Signed-off-by: Laurent Dufour <ldufour@linux.vnet.ibm.com>
>> ---
>> A  mm/memory.c | 23 ++++++++++-------------
>> A  1 file changed, 10 insertions(+), 13 deletions(-)
>>
>> diff --git a/mm/memory.c b/mm/memory.c
>> index 96910c625daa..53b6344a90d2 100644
>> --- a/mm/memory.c
>> +++ b/mm/memory.c
>> @@ -817,19 +817,13 @@ static void print_bad_pte(struct vm_area_struct *vma,
>> unsigned long addr,
>> A A  * PFNMAP mappings in order to support COWable mappings.
>> A A  *
>> A A  */
>> -#ifdef CONFIG_ARCH_HAS_PTE_SPECIAL
>> -# define HAVE_PTE_SPECIAL 1
>> -#else
>> -# define HAVE_PTE_SPECIAL 0
>> -#endif
>> A  struct page *_vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
>> A A A A A A A A A A A A A A A A A A  pte_t pte, bool with_public_device)
>> A  {
>> A A A A A  unsigned long pfn = pte_pfn(pte);
>> A  -A A A  if (HAVE_PTE_SPECIAL) {
>> -A A A A A A A  if (likely(!pte_special(pte)))
>> -A A A A A A A A A A A  goto check_pfn;
>> +#ifdef CONFIG_ARCH_HAS_PTE_SPECIAL
> 
> Nit: Couldn't you use IS_ENABLED(CONFIG_ARCH_HAS_PTE_SPECIAL) within the
> existing code structure to avoid having to add these #ifdefs?

I agree, that would be better. I didn't thought about this option..
Thanks for reporting this.

^ permalink raw reply	[flat|nested] 55+ messages in thread
* [PATCH v2 2/2] mm: remove odd HAVE_PTE_SPECIAL
@ 2018-04-10 16:44       ` Laurent Dufour
  0 siblings, 0 replies; 55+ messages in thread
From: Laurent Dufour @ 2018-04-10 16:44 UTC (permalink / raw)
  To: linux-snps-arc



On 10/04/2018 17:58, Robin Murphy wrote:
> On 10/04/18 16:25, Laurent Dufour wrote:
>> Remove the additional define HAVE_PTE_SPECIAL and rely directly on
>> CONFIG_ARCH_HAS_PTE_SPECIAL.
>>
>> There is no functional change introduced by this patch
>>
>> Signed-off-by: Laurent Dufour <ldufour at linux.vnet.ibm.com>
>> ---
>> ? mm/memory.c | 23 ++++++++++-------------
>> ? 1 file changed, 10 insertions(+), 13 deletions(-)
>>
>> diff --git a/mm/memory.c b/mm/memory.c
>> index 96910c625daa..53b6344a90d2 100644
>> --- a/mm/memory.c
>> +++ b/mm/memory.c
>> @@ -817,19 +817,13 @@ static void print_bad_pte(struct vm_area_struct *vma,
>> unsigned long addr,
>> ?? * PFNMAP mappings in order to support COWable mappings.
>> ?? *
>> ?? */
>> -#ifdef CONFIG_ARCH_HAS_PTE_SPECIAL
>> -# define HAVE_PTE_SPECIAL 1
>> -#else
>> -# define HAVE_PTE_SPECIAL 0
>> -#endif
>> ? struct page *_vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
>> ?????????????????? pte_t pte, bool with_public_device)
>> ? {
>> ????? unsigned long pfn = pte_pfn(pte);
>> ? -??? if (HAVE_PTE_SPECIAL) {
>> -??????? if (likely(!pte_special(pte)))
>> -??????????? goto check_pfn;
>> +#ifdef CONFIG_ARCH_HAS_PTE_SPECIAL
> 
> Nit: Couldn't you use IS_ENABLED(CONFIG_ARCH_HAS_PTE_SPECIAL) within the
> existing code structure to avoid having to add these #ifdefs?

I agree, that would be better. I didn't thought about this option..
Thanks for reporting this.

^ permalink raw reply	[flat|nested] 55+ messages in thread
* [PATCH v2 2/2] mm: remove odd HAVE_PTE_SPECIAL
@ 2018-04-10 16:44       ` Laurent Dufour
  0 siblings, 0 replies; 55+ messages in thread
From: Laurent Dufour @ 2018-04-10 16:44 UTC (permalink / raw)
  To: linux-arm-kernel



On 10/04/2018 17:58, Robin Murphy wrote:
> On 10/04/18 16:25, Laurent Dufour wrote:
>> Remove the additional define HAVE_PTE_SPECIAL and rely directly on
>> CONFIG_ARCH_HAS_PTE_SPECIAL.
>>
>> There is no functional change introduced by this patch
>>
>> Signed-off-by: Laurent Dufour <ldufour@linux.vnet.ibm.com>
>> ---
>> ? mm/memory.c | 23 ++++++++++-------------
>> ? 1 file changed, 10 insertions(+), 13 deletions(-)
>>
>> diff --git a/mm/memory.c b/mm/memory.c
>> index 96910c625daa..53b6344a90d2 100644
>> --- a/mm/memory.c
>> +++ b/mm/memory.c
>> @@ -817,19 +817,13 @@ static void print_bad_pte(struct vm_area_struct *vma,
>> unsigned long addr,
>> ?? * PFNMAP mappings in order to support COWable mappings.
>> ?? *
>> ?? */
>> -#ifdef CONFIG_ARCH_HAS_PTE_SPECIAL
>> -# define HAVE_PTE_SPECIAL 1
>> -#else
>> -# define HAVE_PTE_SPECIAL 0
>> -#endif
>> ? struct page *_vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
>> ?????????????????? pte_t pte, bool with_public_device)
>> ? {
>> ????? unsigned long pfn = pte_pfn(pte);
>> ? -??? if (HAVE_PTE_SPECIAL) {
>> -??????? if (likely(!pte_special(pte)))
>> -??????????? goto check_pfn;
>> +#ifdef CONFIG_ARCH_HAS_PTE_SPECIAL
> 
> Nit: Couldn't you use IS_ENABLED(CONFIG_ARCH_HAS_PTE_SPECIAL) within the
> existing code structure to avoid having to add these #ifdefs?

I agree, that would be better. I didn't thought about this option..
Thanks for reporting this.

^ permalink raw reply	[flat|nested] 55+ messages in thread
* Re: [PATCH v2 1/2] mm: introduce ARCH_HAS_PTE_SPECIAL
  2018-04-10 16:09     ` Matthew Wilcox
                         ` (3 preceding siblings ...)
  (?)
@ 2018-04-10 20:44       ` Palmer Dabbelt
  -1 siblings, 0 replies; 55+ messages in thread
From: Palmer Dabbelt @ 2018-04-10 20:44 UTC (permalink / raw)
  To: linux-arm-kernel

On Tue, 10 Apr 2018 09:09:32 PDT (-0700), willy@infradead.org wrote:
> On Tue, Apr 10, 2018 at 05:25:50PM +0200, Laurent Dufour wrote:
>>  arch/powerpc/include/asm/pte-common.h                  | 3 ---
>>  arch/riscv/Kconfig                                     | 1 +
>>  arch/s390/Kconfig                                      | 1 +
>
> You forgot to delete __HAVE_ARCH_PTE_SPECIAL from
> arch/riscv/include/asm/pgtable-bits.h

Thanks -- I was looking for that but couldn't find it and assumed I'd just 
misunderstood something.

^ permalink raw reply	[flat|nested] 55+ messages in thread
* Re: [PATCH v2 1/2] mm: introduce ARCH_HAS_PTE_SPECIAL
@ 2018-04-10 20:44       ` Palmer Dabbelt
  0 siblings, 0 replies; 55+ messages in thread
From: Palmer Dabbelt @ 2018-04-10 20:44 UTC (permalink / raw)
  To: willy
  Cc: ldufour, linux-kernel, linux-mm, linuxppc-dev, x86, linux-doc,
	linux-snps-arc, linux-arm-kernel, linux-riscv, linux-s390,
	linux-sh, sparclinux, jglisse, mhocko, aneesh.kumar, akpm, mpe,
	benh, paulus, corbet, catalin.marinas, Will Deacon, ysato,
	dalias, davem, tglx, mingo, vgupta, albert, schwidefsky,
	heiko.carstens, rientjes

On Tue, 10 Apr 2018 09:09:32 PDT (-0700), willy@infradead.org wrote:
> On Tue, Apr 10, 2018 at 05:25:50PM +0200, Laurent Dufour wrote:
>>  arch/powerpc/include/asm/pte-common.h                  | 3 ---
>>  arch/riscv/Kconfig                                     | 1 +
>>  arch/s390/Kconfig                                      | 1 +
>
> You forgot to delete __HAVE_ARCH_PTE_SPECIAL from
> arch/riscv/include/asm/pgtable-bits.h

Thanks -- I was looking for that but couldn't find it and assumed I'd just 
misunderstood something.

^ permalink raw reply	[flat|nested] 55+ messages in thread
* Re: [PATCH v2 1/2] mm: introduce ARCH_HAS_PTE_SPECIAL
@ 2018-04-10 20:44       ` Palmer Dabbelt
  0 siblings, 0 replies; 55+ messages in thread
From: Palmer Dabbelt @ 2018-04-10 20:44 UTC (permalink / raw)
  To: willy
  Cc: ldufour, linux-kernel, linux-mm, linuxppc-dev, x86, linux-doc,
	linux-snps-arc, linux-arm-kernel, linux-riscv, linux-s390,
	linux-sh, sparclinux, jglisse, mhocko, aneesh.kumar, akpm, mpe,
	benh, paulus, corbet, catalin.marinas, Will Deacon, ysato,
	dalias, davem, tglx, mingo, vgupta, albert, schwidefsky,
	heiko.carstens, rientjes

On Tue, 10 Apr 2018 09:09:32 PDT (-0700), willy@infradead.org wrote:
> On Tue, Apr 10, 2018 at 05:25:50PM +0200, Laurent Dufour wrote:
>>  arch/powerpc/include/asm/pte-common.h                  | 3 ---
>>  arch/riscv/Kconfig                                     | 1 +
>>  arch/s390/Kconfig                                      | 1 +
>
> You forgot to delete __HAVE_ARCH_PTE_SPECIAL from
> arch/riscv/include/asm/pgtable-bits.h

Thanks -- I was looking for that but couldn't find it and assumed I'd just 
misunderstood something.
--
To unsubscribe from this list: send the line "unsubscribe linux-doc" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html

^ permalink raw reply	[flat|nested] 55+ messages in thread
* [PATCH v2 1/2] mm: introduce ARCH_HAS_PTE_SPECIAL
@ 2018-04-10 20:44       ` Palmer Dabbelt
  0 siblings, 0 replies; 55+ messages in thread
From: Palmer Dabbelt @ 2018-04-10 20:44 UTC (permalink / raw)
  To: linux-riscv

On Tue, 10 Apr 2018 09:09:32 PDT (-0700), willy at infradead.org wrote:
> On Tue, Apr 10, 2018 at 05:25:50PM +0200, Laurent Dufour wrote:
>>  arch/powerpc/include/asm/pte-common.h                  | 3 ---
>>  arch/riscv/Kconfig                                     | 1 +
>>  arch/s390/Kconfig                                      | 1 +
>
> You forgot to delete __HAVE_ARCH_PTE_SPECIAL from
> arch/riscv/include/asm/pgtable-bits.h

Thanks -- I was looking for that but couldn't find it and assumed I'd just 
misunderstood something.

^ permalink raw reply	[flat|nested] 55+ messages in thread
* [PATCH v2 1/2] mm: introduce ARCH_HAS_PTE_SPECIAL
@ 2018-04-10 20:44       ` Palmer Dabbelt
  0 siblings, 0 replies; 55+ messages in thread
From: Palmer Dabbelt @ 2018-04-10 20:44 UTC (permalink / raw)
  To: linux-snps-arc

On Tue, 10 Apr 2018 09:09:32 PDT (-0700), willy@infradead.org wrote:
> On Tue, Apr 10, 2018@05:25:50PM +0200, Laurent Dufour wrote:
>>  arch/powerpc/include/asm/pte-common.h                  | 3 ---
>>  arch/riscv/Kconfig                                     | 1 +
>>  arch/s390/Kconfig                                      | 1 +
>
> You forgot to delete __HAVE_ARCH_PTE_SPECIAL from
> arch/riscv/include/asm/pgtable-bits.h

Thanks -- I was looking for that but couldn't find it and assumed I'd just 
misunderstood something.

^ permalink raw reply	[flat|nested] 55+ messages in thread
* [PATCH v2 1/2] mm: introduce ARCH_HAS_PTE_SPECIAL
@ 2018-04-10 20:44       ` Palmer Dabbelt
  0 siblings, 0 replies; 55+ messages in thread
From: Palmer Dabbelt @ 2018-04-10 20:44 UTC (permalink / raw)
  To: linux-arm-kernel

On Tue, 10 Apr 2018 09:09:32 PDT (-0700), willy at infradead.org wrote:
> On Tue, Apr 10, 2018 at 05:25:50PM +0200, Laurent Dufour wrote:
>>  arch/powerpc/include/asm/pte-common.h                  | 3 ---
>>  arch/riscv/Kconfig                                     | 1 +
>>  arch/s390/Kconfig                                      | 1 +
>
> You forgot to delete __HAVE_ARCH_PTE_SPECIAL from
> arch/riscv/include/asm/pgtable-bits.h

Thanks -- I was looking for that but couldn't find it and assumed I'd just 
misunderstood something.

^ permalink raw reply	[flat|nested] 55+ messages in thread
* Re: [PATCH v2 1/2] mm: introduce ARCH_HAS_PTE_SPECIAL
  2018-04-10 16:42       ` Laurent Dufour
                           ` (3 preceding siblings ...)
  (?)
@ 2018-04-10 20:51         ` David Rientjes
  -1 siblings, 0 replies; 55+ messages in thread
From: David Rientjes @ 2018-04-10 20:51 UTC (permalink / raw)
  To: linux-arm-kernel

On Tue, 10 Apr 2018, Laurent Dufour wrote:

> > On Tue, Apr 10, 2018 at 05:25:50PM +0200, Laurent Dufour wrote:
> >>  arch/powerpc/include/asm/pte-common.h                  | 3 ---
> >>  arch/riscv/Kconfig                                     | 1 +
> >>  arch/s390/Kconfig                                      | 1 +
> > 
> > You forgot to delete __HAVE_ARCH_PTE_SPECIAL from
> > arch/riscv/include/asm/pgtable-bits.h
> 
> Damned !
> Thanks for catching it.
> 

Squashing the two patches together at least allowed it to be caught 
easily.  After it's fixed, feel free to add

	Acked-by: David Rientjes <rientjes@google.com>

Thanks for doing this!

^ permalink raw reply	[flat|nested] 55+ messages in thread
* Re: [PATCH v2 1/2] mm: introduce ARCH_HAS_PTE_SPECIAL
@ 2018-04-10 20:51         ` David Rientjes
  0 siblings, 0 replies; 55+ messages in thread
From: David Rientjes @ 2018-04-10 20:51 UTC (permalink / raw)
  To: Laurent Dufour
  Cc: Matthew Wilcox, linux-kernel, linux-mm, linuxppc-dev, x86,
	linux-doc, linux-snps-arc, linux-arm-kernel, linux-riscv,
	linux-s390, linux-sh, sparclinux, Jerome Glisse, mhocko,
	aneesh.kumar, akpm, mpe, benh, paulus, Jonathan Corbet,
	Catalin Marinas, Will Deacon, Yoshinori Sato, Rich Felker,
	David S . Miller, Thomas Gleixner, Ingo Molnar, Vineet Gupta,
	Palmer Dabbelt, Albert Ou, Martin Schwidefsky, Heiko Carstens

On Tue, 10 Apr 2018, Laurent Dufour wrote:

> > On Tue, Apr 10, 2018 at 05:25:50PM +0200, Laurent Dufour wrote:
> >>  arch/powerpc/include/asm/pte-common.h                  | 3 ---
> >>  arch/riscv/Kconfig                                     | 1 +
> >>  arch/s390/Kconfig                                      | 1 +
> > 
> > You forgot to delete __HAVE_ARCH_PTE_SPECIAL from
> > arch/riscv/include/asm/pgtable-bits.h
> 
> Damned !
> Thanks for catching it.
> 

Squashing the two patches together at least allowed it to be caught 
easily.  After it's fixed, feel free to add

	Acked-by: David Rientjes <rientjes@google.com>

Thanks for doing this!

^ permalink raw reply	[flat|nested] 55+ messages in thread
* Re: [PATCH v2 1/2] mm: introduce ARCH_HAS_PTE_SPECIAL
@ 2018-04-10 20:51         ` David Rientjes
  0 siblings, 0 replies; 55+ messages in thread
From: David Rientjes @ 2018-04-10 20:51 UTC (permalink / raw)
  To: Laurent Dufour
  Cc: Matthew Wilcox, linux-kernel, linux-mm, linuxppc-dev, x86,
	linux-doc, linux-snps-arc, linux-arm-kernel, linux-riscv,
	linux-s390, linux-sh, sparclinux, Jerome Glisse, mhocko,
	aneesh.kumar, akpm, mpe, benh, paulus, Jonathan Corbet,
	Catalin Marinas, Will Deacon, Yoshinori Sato, Rich Felker,
	David S . Miller, Thomas Gleixner, Ingo Molnar, Vineet Gupta,
	Palmer Dabbelt, Albert Ou, Martin Schwidefsky, Heiko Carstens

On Tue, 10 Apr 2018, Laurent Dufour wrote:

> > On Tue, Apr 10, 2018 at 05:25:50PM +0200, Laurent Dufour wrote:
> >>  arch/powerpc/include/asm/pte-common.h                  | 3 ---
> >>  arch/riscv/Kconfig                                     | 1 +
> >>  arch/s390/Kconfig                                      | 1 +
> > 
> > You forgot to delete __HAVE_ARCH_PTE_SPECIAL from
> > arch/riscv/include/asm/pgtable-bits.h
> 
> Damned !
> Thanks for catching it.
> 

Squashing the two patches together at least allowed it to be caught 
easily.  After it's fixed, feel free to add

	Acked-by: David Rientjes <rientjes@google.com>

Thanks for doing this!
--
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^ permalink raw reply	[flat|nested] 55+ messages in thread
* [PATCH v2 1/2] mm: introduce ARCH_HAS_PTE_SPECIAL
@ 2018-04-10 20:51         ` David Rientjes
  0 siblings, 0 replies; 55+ messages in thread
From: David Rientjes @ 2018-04-10 20:51 UTC (permalink / raw)
  To: linux-riscv

On Tue, 10 Apr 2018, Laurent Dufour wrote:

> > On Tue, Apr 10, 2018 at 05:25:50PM +0200, Laurent Dufour wrote:
> >>  arch/powerpc/include/asm/pte-common.h                  | 3 ---
> >>  arch/riscv/Kconfig                                     | 1 +
> >>  arch/s390/Kconfig                                      | 1 +
> > 
> > You forgot to delete __HAVE_ARCH_PTE_SPECIAL from
> > arch/riscv/include/asm/pgtable-bits.h
> 
> Damned !
> Thanks for catching it.
> 

Squashing the two patches together at least allowed it to be caught 
easily.  After it's fixed, feel free to add

	Acked-by: David Rientjes <rientjes@google.com>

Thanks for doing this!

^ permalink raw reply	[flat|nested] 55+ messages in thread
* [PATCH v2 1/2] mm: introduce ARCH_HAS_PTE_SPECIAL
@ 2018-04-10 20:51         ` David Rientjes
  0 siblings, 0 replies; 55+ messages in thread
From: David Rientjes @ 2018-04-10 20:51 UTC (permalink / raw)
  To: linux-snps-arc

On Tue, 10 Apr 2018, Laurent Dufour wrote:

> > On Tue, Apr 10, 2018@05:25:50PM +0200, Laurent Dufour wrote:
> >>  arch/powerpc/include/asm/pte-common.h                  | 3 ---
> >>  arch/riscv/Kconfig                                     | 1 +
> >>  arch/s390/Kconfig                                      | 1 +
> > 
> > You forgot to delete __HAVE_ARCH_PTE_SPECIAL from
> > arch/riscv/include/asm/pgtable-bits.h
> 
> Damned !
> Thanks for catching it.
> 

Squashing the two patches together at least allowed it to be caught 
easily.  After it's fixed, feel free to add

	Acked-by: David Rientjes <rientjes at google.com>

Thanks for doing this!

^ permalink raw reply	[flat|nested] 55+ messages in thread
* [PATCH v2 1/2] mm: introduce ARCH_HAS_PTE_SPECIAL
@ 2018-04-10 20:51         ` David Rientjes
  0 siblings, 0 replies; 55+ messages in thread
From: David Rientjes @ 2018-04-10 20:51 UTC (permalink / raw)
  To: linux-arm-kernel

On Tue, 10 Apr 2018, Laurent Dufour wrote:

> > On Tue, Apr 10, 2018 at 05:25:50PM +0200, Laurent Dufour wrote:
> >>  arch/powerpc/include/asm/pte-common.h                  | 3 ---
> >>  arch/riscv/Kconfig                                     | 1 +
> >>  arch/s390/Kconfig                                      | 1 +
> > 
> > You forgot to delete __HAVE_ARCH_PTE_SPECIAL from
> > arch/riscv/include/asm/pgtable-bits.h
> 
> Damned !
> Thanks for catching it.
> 

Squashing the two patches together at least allowed it to be caught 
easily.  After it's fixed, feel free to add

	Acked-by: David Rientjes <rientjes@google.com>

Thanks for doing this!

^ permalink raw reply	[flat|nested] 55+ messages in thread
end of thread, other threads:[~2018-04-10 20:51 UTC | newest]

Thread overview: 55+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2018-04-10 15:25 [PATCH v2 0/2] move __HAVE_ARCH_PTE_SPECIAL in Kconfig Laurent Dufour
2018-04-10 15:25 ` Laurent Dufour
2018-04-10 15:25 ` Laurent Dufour
2018-04-10 15:25 ` Laurent Dufour
2018-04-10 15:25 ` Laurent Dufour
2018-04-10 15:25 ` Laurent Dufour
2018-04-10 15:25 ` [PATCH v2 1/2] mm: introduce ARCH_HAS_PTE_SPECIAL Laurent Dufour
2018-04-10 15:25   ` Laurent Dufour
2018-04-10 15:25   ` Laurent Dufour
2018-04-10 15:25   ` Laurent Dufour
2018-04-10 15:25   ` Laurent Dufour
2018-04-10 15:25   ` Laurent Dufour
2018-04-10 16:09   ` Matthew Wilcox
2018-04-10 16:09     ` Matthew Wilcox
2018-04-10 16:09     ` Matthew Wilcox
2018-04-10 16:09     ` Matthew Wilcox
2018-04-10 16:09     ` Matthew Wilcox
2018-04-10 16:09     ` Matthew Wilcox
2018-04-10 16:42     ` Laurent Dufour
2018-04-10 16:42       ` Laurent Dufour
2018-04-10 16:42       ` Laurent Dufour
2018-04-10 16:42       ` Laurent Dufour
2018-04-10 16:42       ` Laurent Dufour
2018-04-10 16:42       ` Laurent Dufour
2018-04-10 20:51       ` David Rientjes
2018-04-10 20:51         ` David Rientjes
2018-04-10 20:51         ` David Rientjes
2018-04-10 20:51         ` David Rientjes
2018-04-10 20:51         ` David Rientjes
2018-04-10 20:51         ` David Rientjes
2018-04-10 20:44     ` Palmer Dabbelt
2018-04-10 20:44       ` Palmer Dabbelt
2018-04-10 20:44       ` Palmer Dabbelt
2018-04-10 20:44       ` Palmer Dabbelt
2018-04-10 20:44       ` Palmer Dabbelt
2018-04-10 20:44       ` Palmer Dabbelt
2018-04-10 15:25 ` [PATCH v2 2/2] mm: remove odd HAVE_PTE_SPECIAL Laurent Dufour
2018-04-10 15:25   ` Laurent Dufour
2018-04-10 15:25   ` Laurent Dufour
2018-04-10 15:25   ` Laurent Dufour
2018-04-10 15:25   ` Laurent Dufour
2018-04-10 15:25   ` Laurent Dufour
2018-04-10 15:58   ` Robin Murphy
2018-04-10 15:58     ` Robin Murphy
2018-04-10 15:58     ` Robin Murphy
2018-04-10 15:58     ` Robin Murphy
2018-04-10 15:58     ` Robin Murphy
2018-04-10 15:58     ` Robin Murphy
2018-04-10 16:44     ` Laurent Dufour
2018-04-10 16:44       ` Laurent Dufour
2018-04-10 16:44       ` Laurent Dufour
2018-04-10 16:44       ` Laurent Dufour
2018-04-10 16:44       ` Laurent Dufour
2018-04-10 16:44       ` Laurent Dufour
2018-04-10 16:44       ` Laurent Dufour

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