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* [PATCH v3 00/23] Use asm-generic for mmu_context no-op functions
@ 2020-09-01 14:15 Nicholas Piggin
  2020-09-01 14:15 ` [PATCH v3 01/23] asm-generic: add generic MMU versions of mmu context functions Nicholas Piggin
                   ` (23 more replies)
  0 siblings, 24 replies; 35+ messages in thread
From: Nicholas Piggin @ 2020-09-01 14:15 UTC (permalink / raw)
  To: linux-arch; +Cc: Nicholas Piggin, linux-kernel, linux-mm, Arnd Bergmann

It would be nice to be able to modify mmu_context functions or add a
hook without updating all architectures, many of which will be no-ops.

The motivation for this series is a change to lazy mmu handling, but
this series stands on its own as a good cleanup whether or not we end
up making that change.

Since v2:
- Fixed build failure on arm64 (fingers crossed), did more cross
  compiling.
- Accounted for feedback and added acks (thanks all).

Arnd, most of the main archs have acks, and I asked for ack/nack
from ones which are missing. We could give those a bit more time
then merge.

Thanks,
Nick

Nicholas Piggin (23):
  asm-generic: add generic MMU versions of mmu context functions
  alpha: use asm-generic/mmu_context.h for no-op implementations
  arc: use asm-generic/mmu_context.h for no-op implementations
  arm: use asm-generic/mmu_context.h for no-op implementations
  arm64: use asm-generic/mmu_context.h for no-op implementations
  csky: use asm-generic/mmu_context.h for no-op implementations
  hexagon: use asm-generic/mmu_context.h for no-op implementations
  ia64: use asm-generic/mmu_context.h for no-op implementations
  m68k: use asm-generic/mmu_context.h for no-op implementations
  microblaze: use asm-generic/mmu_context.h for no-op implementations
  mips: use asm-generic/mmu_context.h for no-op implementations
  nds32: use asm-generic/mmu_context.h for no-op implementations
  nios2: use asm-generic/mmu_context.h for no-op implementations
  openrisc: use asm-generic/mmu_context.h for no-op implementations
  parisc: use asm-generic/mmu_context.h for no-op implementations
  powerpc: use asm-generic/mmu_context.h for no-op implementations
  riscv: use asm-generic/mmu_context.h for no-op implementations
  s390: use asm-generic/mmu_context.h for no-op implementations
  sh: use asm-generic/mmu_context.h for no-op implementations
  sparc: use asm-generic/mmu_context.h for no-op implementations
  um: use asm-generic/mmu_context.h for no-op implementations
  x86: use asm-generic/mmu_context.h for no-op implementations
  xtensa: use asm-generic/mmu_context.h for no-op implementations

 arch/alpha/include/asm/mmu_context.h         | 12 ++--
 arch/arc/include/asm/mmu_context.h           | 17 +++---
 arch/arm/include/asm/mmu_context.h           | 26 +--------
 arch/arm64/include/asm/mmu_context.h         |  7 +--
 arch/c6x/include/asm/mmu_context.h           |  6 ++
 arch/csky/include/asm/mmu_context.h          |  8 +--
 arch/hexagon/include/asm/mmu_context.h       | 33 ++---------
 arch/ia64/include/asm/mmu_context.h          | 17 ++----
 arch/m68k/include/asm/mmu_context.h          | 37 +++----------
 arch/microblaze/include/asm/mmu_context.h    |  2 +-
 arch/microblaze/include/asm/mmu_context_mm.h |  8 +--
 arch/microblaze/include/asm/processor.h      |  3 -
 arch/mips/include/asm/mmu_context.h          | 11 ++--
 arch/nds32/include/asm/mmu_context.h         | 10 +---
 arch/nios2/include/asm/mmu_context.h         | 21 ++-----
 arch/openrisc/include/asm/mmu_context.h      |  8 +--
 arch/parisc/include/asm/mmu_context.h        | 12 ++--
 arch/powerpc/include/asm/mmu_context.h       | 13 +++--
 arch/riscv/include/asm/mmu_context.h         | 22 +-------
 arch/s390/include/asm/mmu_context.h          |  9 ++-
 arch/sh/include/asm/mmu_context.h            |  7 +--
 arch/sh/include/asm/mmu_context_32.h         |  9 ---
 arch/sparc/include/asm/mmu_context_32.h      | 10 ++--
 arch/sparc/include/asm/mmu_context_64.h      | 10 ++--
 arch/um/include/asm/mmu_context.h            | 12 ++--
 arch/x86/include/asm/mmu_context.h           |  6 ++
 arch/xtensa/include/asm/mmu_context.h        | 11 +---
 arch/xtensa/include/asm/nommu_context.h      | 26 +--------
 include/asm-generic/mmu_context.h            | 58 +++++++++++++++-----
 include/asm-generic/nommu_context.h          | 19 +++++++
 30 files changed, 174 insertions(+), 276 deletions(-)
 create mode 100644 arch/c6x/include/asm/mmu_context.h
 create mode 100644 include/asm-generic/nommu_context.h

-- 
2.23.0


^ permalink raw reply	[flat|nested] 35+ messages in thread

* [PATCH v3 01/23] asm-generic: add generic MMU versions of mmu context functions
  2020-09-01 14:15 [PATCH v3 00/23] Use asm-generic for mmu_context no-op functions Nicholas Piggin
@ 2020-09-01 14:15 ` Nicholas Piggin
  2020-09-01 14:15 ` [PATCH v3 02/23] alpha: use asm-generic/mmu_context.h for no-op implementations Nicholas Piggin
                   ` (22 subsequent siblings)
  23 siblings, 0 replies; 35+ messages in thread
From: Nicholas Piggin @ 2020-09-01 14:15 UTC (permalink / raw)
  To: linux-arch
  Cc: Nicholas Piggin, linux-kernel, linux-mm, Arnd Bergmann, Mike Rapoport

Many of these are no-ops on many architectures, so extend mmu_context.h
to cover MMU and NOMMU, and split the NOMMU bits out to nommu_context.h

Cc: linux-arch@vger.kernel.org
Acked-by: Mike Rapoport <rppt@linux.ibm.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
 arch/c6x/include/asm/mmu_context.h        |  6 +++
 arch/microblaze/include/asm/mmu_context.h |  2 +-
 arch/sh/include/asm/mmu_context.h         |  2 +-
 include/asm-generic/mmu_context.h         | 58 +++++++++++++++++------
 include/asm-generic/nommu_context.h       | 19 ++++++++
 5 files changed, 71 insertions(+), 16 deletions(-)
 create mode 100644 arch/c6x/include/asm/mmu_context.h
 create mode 100644 include/asm-generic/nommu_context.h

diff --git a/arch/c6x/include/asm/mmu_context.h b/arch/c6x/include/asm/mmu_context.h
new file mode 100644
index 000000000000..d2659d0a3297
--- /dev/null
+++ b/arch/c6x/include/asm/mmu_context.h
@@ -0,0 +1,6 @@
+#ifndef _ASM_C6X_MMU_CONTEXT_H
+#define _ASM_C6X_MMU_CONTEXT_H
+
+#include <asm-generic/nommu_context.h>
+
+#endif /* _ASM_C6X_MMU_CONTEXT_H */
diff --git a/arch/microblaze/include/asm/mmu_context.h b/arch/microblaze/include/asm/mmu_context.h
index f74f9da07fdc..34004efb3def 100644
--- a/arch/microblaze/include/asm/mmu_context.h
+++ b/arch/microblaze/include/asm/mmu_context.h
@@ -2,5 +2,5 @@
 #ifdef CONFIG_MMU
 # include <asm/mmu_context_mm.h>
 #else
-# include <asm-generic/mmu_context.h>
+# include <asm-generic/nommu_context.h>
 #endif
diff --git a/arch/sh/include/asm/mmu_context.h b/arch/sh/include/asm/mmu_context.h
index f664e51e8a15..461b1304580b 100644
--- a/arch/sh/include/asm/mmu_context.h
+++ b/arch/sh/include/asm/mmu_context.h
@@ -133,7 +133,7 @@ static inline void switch_mm(struct mm_struct *prev,
 #define set_TTB(pgd)			do { } while (0)
 #define get_TTB()			(0)
 
-#include <asm-generic/mmu_context.h>
+#include <asm-generic/nommu_context.h>
 
 #endif /* CONFIG_MMU */
 
diff --git a/include/asm-generic/mmu_context.h b/include/asm-generic/mmu_context.h
index 6be9106fb6fb..91727065bacb 100644
--- a/include/asm-generic/mmu_context.h
+++ b/include/asm-generic/mmu_context.h
@@ -3,44 +3,74 @@
 #define __ASM_GENERIC_MMU_CONTEXT_H
 
 /*
- * Generic hooks for NOMMU architectures, which do not need to do
- * anything special here.
+ * Generic hooks to implement no-op functionality.
  */
 
-#include <asm-generic/mm_hooks.h>
-
 struct task_struct;
 struct mm_struct;
 
+/*
+ * enter_lazy_tlb - Called when "tsk" is about to enter lazy TLB mode.
+ *
+ * @mm:  the currently active mm context which is becoming lazy
+ * @tsk: task which is entering lazy tlb
+ *
+ * tsk->mm will be NULL
+ */
+#ifndef enter_lazy_tlb
 static inline void enter_lazy_tlb(struct mm_struct *mm,
 			struct task_struct *tsk)
 {
 }
+#endif
 
+/**
+ * init_new_context - Initialize context of a new mm_struct.
+ * @tsk: task struct for the mm
+ * @mm:  the new mm struct
+ * @return: 0 on success, -errno on failure
+ */
+#ifndef init_new_context
 static inline int init_new_context(struct task_struct *tsk,
 			struct mm_struct *mm)
 {
 	return 0;
 }
+#endif
 
+/**
+ * destroy_context - Undo init_new_context when the mm is going away
+ * @mm: old mm struct
+ */
+#ifndef destroy_context
 static inline void destroy_context(struct mm_struct *mm)
 {
 }
+#endif
 
-static inline void deactivate_mm(struct task_struct *task,
-			struct mm_struct *mm)
-{
-}
-
-static inline void switch_mm(struct mm_struct *prev,
-			struct mm_struct *next,
-			struct task_struct *tsk)
+/**
+ * activate_mm - called after exec switches the current task to a new mm, to switch to it
+ * @prev_mm: previous mm of this task
+ * @next_mm: new mm
+ */
+#ifndef activate_mm
+static inline void activate_mm(struct mm_struct *prev_mm,
+			       struct mm_struct *next_mm)
 {
+	switch_mm(prev_mm, next_mm, current);
 }
+#endif
 
-static inline void activate_mm(struct mm_struct *prev_mm,
-			       struct mm_struct *next_mm)
+/**
+ * dectivate_mm - called when an mm is released after exit or exec switches away from it
+ * @tsk: the task
+ * @mm:  the old mm
+ */
+#ifndef deactivate_mm
+static inline void deactivate_mm(struct task_struct *tsk,
+			struct mm_struct *mm)
 {
 }
+#endif
 
 #endif /* __ASM_GENERIC_MMU_CONTEXT_H */
diff --git a/include/asm-generic/nommu_context.h b/include/asm-generic/nommu_context.h
new file mode 100644
index 000000000000..4f916f9e16cd
--- /dev/null
+++ b/include/asm-generic/nommu_context.h
@@ -0,0 +1,19 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __ASM_GENERIC_NOMMU_H
+#define __ASM_GENERIC_NOMMU_H
+
+/*
+ * Generic hooks for NOMMU architectures, which do not need to do
+ * anything special here.
+ */
+#include <asm-generic/mm_hooks.h>
+
+static inline void switch_mm(struct mm_struct *prev,
+			struct mm_struct *next,
+			struct task_struct *tsk)
+{
+}
+
+#include <asm-generic/mmu_context.h>
+
+#endif /* __ASM_GENERIC_NOMMU_H */
-- 
2.23.0


^ permalink raw reply	[flat|nested] 35+ messages in thread

* [PATCH v3 02/23] alpha: use asm-generic/mmu_context.h for no-op implementations
  2020-09-01 14:15 [PATCH v3 00/23] Use asm-generic for mmu_context no-op functions Nicholas Piggin
  2020-09-01 14:15 ` [PATCH v3 01/23] asm-generic: add generic MMU versions of mmu context functions Nicholas Piggin
@ 2020-09-01 14:15 ` Nicholas Piggin
  2020-09-01 16:51   ` Matt Turner
  2020-09-01 14:15 ` [PATCH v3 03/23] arc: " Nicholas Piggin
                   ` (21 subsequent siblings)
  23 siblings, 1 reply; 35+ messages in thread
From: Nicholas Piggin @ 2020-09-01 14:15 UTC (permalink / raw)
  To: linux-arch
  Cc: Nicholas Piggin, linux-kernel, linux-mm, Arnd Bergmann,
	Richard Henderson, Ivan Kokshaysky, Matt Turner, linux-alpha

Cc: Richard Henderson <rth@twiddle.net>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Matt Turner <mattst88@gmail.com>
Cc: linux-alpha@vger.kernel.org
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---

Please ack or nack if you object to this being mered via
Arnd's tree.

 arch/alpha/include/asm/mmu_context.h | 12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)

diff --git a/arch/alpha/include/asm/mmu_context.h b/arch/alpha/include/asm/mmu_context.h
index 6d7d9bc1b4b8..4eea7c616992 100644
--- a/arch/alpha/include/asm/mmu_context.h
+++ b/arch/alpha/include/asm/mmu_context.h
@@ -214,8 +214,6 @@ ev4_activate_mm(struct mm_struct *prev_mm, struct mm_struct *next_mm)
 	tbiap();
 }
 
-#define deactivate_mm(tsk,mm)	do { } while (0)
-
 #ifdef CONFIG_ALPHA_GENERIC
 # define switch_mm(a,b,c)	alpha_mv.mv_switch_mm((a),(b),(c))
 # define activate_mm(x,y)	alpha_mv.mv_activate_mm((x),(y))
@@ -229,6 +227,7 @@ ev4_activate_mm(struct mm_struct *prev_mm, struct mm_struct *next_mm)
 # endif
 #endif
 
+#define init_new_context init_new_context
 static inline int
 init_new_context(struct task_struct *tsk, struct mm_struct *mm)
 {
@@ -242,12 +241,7 @@ init_new_context(struct task_struct *tsk, struct mm_struct *mm)
 	return 0;
 }
 
-extern inline void
-destroy_context(struct mm_struct *mm)
-{
-	/* Nothing to do.  */
-}
-
+#define enter_lazy_tlb enter_lazy_tlb
 static inline void
 enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
 {
@@ -255,6 +249,8 @@ enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
 	  = ((unsigned long)mm->pgd - IDENT_ADDR) >> PAGE_SHIFT;
 }
 
+#include <asm-generic/mmu_context.h>
+
 #ifdef __MMU_EXTERN_INLINE
 #undef __EXTERN_INLINE
 #undef __MMU_EXTERN_INLINE
-- 
2.23.0


^ permalink raw reply	[flat|nested] 35+ messages in thread

* [PATCH v3 03/23] arc: use asm-generic/mmu_context.h for no-op implementations
  2020-09-01 14:15 [PATCH v3 00/23] Use asm-generic for mmu_context no-op functions Nicholas Piggin
  2020-09-01 14:15 ` [PATCH v3 01/23] asm-generic: add generic MMU versions of mmu context functions Nicholas Piggin
  2020-09-01 14:15 ` [PATCH v3 02/23] alpha: use asm-generic/mmu_context.h for no-op implementations Nicholas Piggin
@ 2020-09-01 14:15 ` Nicholas Piggin
  2020-09-01 18:32   ` Vineet Gupta
  2020-09-01 14:15 ` [PATCH v3 04/23] arm: " Nicholas Piggin
                   ` (20 subsequent siblings)
  23 siblings, 1 reply; 35+ messages in thread
From: Nicholas Piggin @ 2020-09-01 14:15 UTC (permalink / raw)
  To: linux-arch
  Cc: Nicholas Piggin, linux-kernel, linux-mm, Arnd Bergmann,
	Vineet Gupta, linux-snps-arc

Cc: Vineet Gupta <vgupta@synopsys.com>
Cc: linux-snps-arc@lists.infradead.org
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---

Please ack or nack if you object to this being mered via
Arnd's tree.

 arch/arc/include/asm/mmu_context.h | 17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)

diff --git a/arch/arc/include/asm/mmu_context.h b/arch/arc/include/asm/mmu_context.h
index 3a5e6a5b9ed6..df164066e172 100644
--- a/arch/arc/include/asm/mmu_context.h
+++ b/arch/arc/include/asm/mmu_context.h
@@ -102,6 +102,7 @@ static inline void get_new_mmu_context(struct mm_struct *mm)
  * Initialize the context related info for a new mm_struct
  * instance.
  */
+#define init_new_context init_new_context
 static inline int
 init_new_context(struct task_struct *tsk, struct mm_struct *mm)
 {
@@ -113,6 +114,7 @@ init_new_context(struct task_struct *tsk, struct mm_struct *mm)
 	return 0;
 }
 
+#define destroy_context destroy_context
 static inline void destroy_context(struct mm_struct *mm)
 {
 	unsigned long flags;
@@ -153,13 +155,13 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
 }
 
 /*
- * Called at the time of execve() to get a new ASID
- * Note the subtlety here: get_new_mmu_context() behaves differently here
- * vs. in switch_mm(). Here it always returns a new ASID, because mm has
- * an unallocated "initial" value, while in latter, it moves to a new ASID,
- * only if it was unallocated
+ * activate_mm defaults (in asm-generic) to switch_mm and is called at the
+ * time of execve() to get a new ASID Note the subtlety here:
+ * get_new_mmu_context() behaves differently here vs. in switch_mm(). Here
+ * it always returns a new ASID, because mm has an unallocated "initial"
+ * value, while in latter, it moves to a new ASID, only if it was
+ * unallocated
  */
-#define activate_mm(prev, next)		switch_mm(prev, next, NULL)
 
 /* it seemed that deactivate_mm( ) is a reasonable place to do book-keeping
  * for retiring-mm. However destroy_context( ) still needs to do that because
@@ -168,8 +170,7 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
  * there is a good chance that task gets sched-out/in, making it's ASID valid
  * again (this teased me for a whole day).
  */
-#define deactivate_mm(tsk, mm)   do { } while (0)
 
-#define enter_lazy_tlb(mm, tsk)
+#include <asm-generic/mmu_context.h>
 
 #endif /* __ASM_ARC_MMU_CONTEXT_H */
-- 
2.23.0


^ permalink raw reply	[flat|nested] 35+ messages in thread

* [PATCH v3 04/23] arm: use asm-generic/mmu_context.h for no-op implementations
  2020-09-01 14:15 [PATCH v3 00/23] Use asm-generic for mmu_context no-op functions Nicholas Piggin
                   ` (2 preceding siblings ...)
  2020-09-01 14:15 ` [PATCH v3 03/23] arc: " Nicholas Piggin
@ 2020-09-01 14:15 ` Nicholas Piggin
  2020-09-01 14:15 ` [PATCH v3 05/23] arm64: " Nicholas Piggin
                   ` (19 subsequent siblings)
  23 siblings, 0 replies; 35+ messages in thread
From: Nicholas Piggin @ 2020-09-01 14:15 UTC (permalink / raw)
  To: linux-arch
  Cc: Nicholas Piggin, linux-kernel, linux-mm, Arnd Bergmann,
	Russell King, linux-arm-kernel

Cc: Russell King <linux@armlinux.org.uk>
Cc: linux-arm-kernel@lists.infradead.org
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---

Please ack or nack if you object to this being mered via
Arnd's tree.

 arch/arm/include/asm/mmu_context.h | 26 +++-----------------------
 1 file changed, 3 insertions(+), 23 deletions(-)

diff --git a/arch/arm/include/asm/mmu_context.h b/arch/arm/include/asm/mmu_context.h
index f99ed524fe41..84e58956fcab 100644
--- a/arch/arm/include/asm/mmu_context.h
+++ b/arch/arm/include/asm/mmu_context.h
@@ -26,6 +26,8 @@ void __check_vmalloc_seq(struct mm_struct *mm);
 #ifdef CONFIG_CPU_HAS_ASID
 
 void check_and_switch_context(struct mm_struct *mm, struct task_struct *tsk);
+
+#define init_new_context init_new_context
 static inline int
 init_new_context(struct task_struct *tsk, struct mm_struct *mm)
 {
@@ -92,32 +94,10 @@ static inline void finish_arch_post_lock_switch(void)
 
 #endif	/* CONFIG_MMU */
 
-static inline int
-init_new_context(struct task_struct *tsk, struct mm_struct *mm)
-{
-	return 0;
-}
-
-
 #endif	/* CONFIG_CPU_HAS_ASID */
 
-#define destroy_context(mm)		do { } while(0)
 #define activate_mm(prev,next)		switch_mm(prev, next, NULL)
 
-/*
- * This is called when "tsk" is about to enter lazy TLB mode.
- *
- * mm:  describes the currently active mm context
- * tsk: task which is entering lazy tlb
- * cpu: cpu number which is entering lazy tlb
- *
- * tsk->mm will be NULL
- */
-static inline void
-enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
-{
-}
-
 /*
  * This is the actual mm switch as far as the scheduler
  * is concerned.  No registers are touched.  We avoid
@@ -149,6 +129,6 @@ switch_mm(struct mm_struct *prev, struct mm_struct *next,
 #endif
 }
 
-#define deactivate_mm(tsk,mm)	do { } while (0)
+#include <asm-generic/mmu_context.h>
 
 #endif
-- 
2.23.0


^ permalink raw reply	[flat|nested] 35+ messages in thread

* [PATCH v3 05/23] arm64: use asm-generic/mmu_context.h for no-op implementations
  2020-09-01 14:15 [PATCH v3 00/23] Use asm-generic for mmu_context no-op functions Nicholas Piggin
                   ` (3 preceding siblings ...)
  2020-09-01 14:15 ` [PATCH v3 04/23] arm: " Nicholas Piggin
@ 2020-09-01 14:15 ` Nicholas Piggin
  2020-09-01 14:15 ` [PATCH v3 06/23] csky: " Nicholas Piggin
                   ` (18 subsequent siblings)
  23 siblings, 0 replies; 35+ messages in thread
From: Nicholas Piggin @ 2020-09-01 14:15 UTC (permalink / raw)
  To: linux-arch
  Cc: Nicholas Piggin, linux-kernel, linux-mm, Arnd Bergmann,
	Will Deacon, linux-arm-kernel, Catalin Marinas

Cc: Will Deacon <will@kernel.org>
Cc: linux-arm-kernel@lists.infradead.org
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
 arch/arm64/include/asm/mmu_context.h | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/arch/arm64/include/asm/mmu_context.h b/arch/arm64/include/asm/mmu_context.h
index f2d7537d6f83..fe2862aa1dad 100644
--- a/arch/arm64/include/asm/mmu_context.h
+++ b/arch/arm64/include/asm/mmu_context.h
@@ -174,7 +174,6 @@ static inline void cpu_replace_ttbr1(pgd_t *pgdp)
  * Setting a reserved TTBR0 or EPD0 would work, but it all gets ugly when you
  * take CPU migration into account.
  */
-#define destroy_context(mm)		do { } while(0)
 void check_and_switch_context(struct mm_struct *mm);
 
 #define init_new_context(tsk,mm)	({ atomic64_set(&(mm)->context.id, 0); 0; })
@@ -202,6 +201,7 @@ static inline void update_saved_ttbr0(struct task_struct *tsk,
 }
 #endif
 
+#define enter_lazy_tlb enter_lazy_tlb
 static inline void
 enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
 {
@@ -242,12 +242,11 @@ switch_mm(struct mm_struct *prev, struct mm_struct *next,
 	update_saved_ttbr0(tsk, next);
 }
 
-#define deactivate_mm(tsk,mm)	do { } while (0)
-#define activate_mm(prev,next)	switch_mm(prev, next, current)
-
 void verify_cpu_asid_bits(void);
 void post_ttbr_update_workaround(void);
 
+#include <asm-generic/mmu_context.h>
+
 #endif /* !__ASSEMBLY__ */
 
 #endif /* !__ASM_MMU_CONTEXT_H */
-- 
2.23.0


^ permalink raw reply	[flat|nested] 35+ messages in thread

* [PATCH v3 06/23] csky: use asm-generic/mmu_context.h for no-op implementations
  2020-09-01 14:15 [PATCH v3 00/23] Use asm-generic for mmu_context no-op functions Nicholas Piggin
                   ` (4 preceding siblings ...)
  2020-09-01 14:15 ` [PATCH v3 05/23] arm64: " Nicholas Piggin
@ 2020-09-01 14:15 ` Nicholas Piggin
  2020-09-01 14:15 ` [PATCH v3 07/23] hexagon: " Nicholas Piggin
                   ` (17 subsequent siblings)
  23 siblings, 0 replies; 35+ messages in thread
From: Nicholas Piggin @ 2020-09-01 14:15 UTC (permalink / raw)
  To: linux-arch
  Cc: Nicholas Piggin, linux-kernel, linux-mm, Arnd Bergmann,
	linux-csky, Guo Ren

Cc: linux-csky@vger.kernel.org
Acked-by: Guo Ren <guoren@kernel.org>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
 arch/csky/include/asm/mmu_context.h | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/arch/csky/include/asm/mmu_context.h b/arch/csky/include/asm/mmu_context.h
index abdf1f1cb6ec..b227d29393a8 100644
--- a/arch/csky/include/asm/mmu_context.h
+++ b/arch/csky/include/asm/mmu_context.h
@@ -24,11 +24,6 @@
 #define cpu_asid(mm)		(atomic64_read(&mm->context.asid) & ASID_MASK)
 
 #define init_new_context(tsk,mm)	({ atomic64_set(&(mm)->context.asid, 0); 0; })
-#define activate_mm(prev,next)		switch_mm(prev, next, current)
-
-#define destroy_context(mm)		do {} while (0)
-#define enter_lazy_tlb(mm, tsk)		do {} while (0)
-#define deactivate_mm(tsk, mm)		do {} while (0)
 
 void check_and_switch_context(struct mm_struct *mm, unsigned int cpu);
 
@@ -46,4 +41,7 @@ switch_mm(struct mm_struct *prev, struct mm_struct *next,
 
 	flush_icache_deferred(next);
 }
+
+#include <asm-generic/mmu_context.h>
+
 #endif /* __ASM_CSKY_MMU_CONTEXT_H */
-- 
2.23.0


^ permalink raw reply	[flat|nested] 35+ messages in thread

* [PATCH v3 07/23] hexagon: use asm-generic/mmu_context.h for no-op implementations
  2020-09-01 14:15 [PATCH v3 00/23] Use asm-generic for mmu_context no-op functions Nicholas Piggin
                   ` (5 preceding siblings ...)
  2020-09-01 14:15 ` [PATCH v3 06/23] csky: " Nicholas Piggin
@ 2020-09-01 14:15 ` Nicholas Piggin
  2020-09-01 14:15 ` [PATCH v3 08/23] ia64: " Nicholas Piggin
                   ` (16 subsequent siblings)
  23 siblings, 0 replies; 35+ messages in thread
From: Nicholas Piggin @ 2020-09-01 14:15 UTC (permalink / raw)
  To: linux-arch
  Cc: Nicholas Piggin, linux-kernel, linux-mm, Arnd Bergmann,
	linux-hexagon, Brian Cain

Cc: linux-hexagon@vger.kernel.org
Acked-by: Brian Cain <bcain@codeaurora.org>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
 arch/hexagon/include/asm/mmu_context.h | 33 ++++----------------------
 1 file changed, 5 insertions(+), 28 deletions(-)

diff --git a/arch/hexagon/include/asm/mmu_context.h b/arch/hexagon/include/asm/mmu_context.h
index cdc4adc0300a..81947764c47d 100644
--- a/arch/hexagon/include/asm/mmu_context.h
+++ b/arch/hexagon/include/asm/mmu_context.h
@@ -15,39 +15,13 @@
 #include <asm/pgalloc.h>
 #include <asm/mem-layout.h>
 
-static inline void destroy_context(struct mm_struct *mm)
-{
-}
-
 /*
  * VM port hides all TLB management, so "lazy TLB" isn't very
  * meaningful.  Even for ports to architectures with visble TLBs,
  * this is almost invariably a null function.
+ *
+ * mm->context is set up by pgd_alloc, so no init_new_context required.
  */
-static inline void enter_lazy_tlb(struct mm_struct *mm,
-	struct task_struct *tsk)
-{
-}
-
-/*
- * Architecture-specific actions, if any, for memory map deactivation.
- */
-static inline void deactivate_mm(struct task_struct *tsk,
-	struct mm_struct *mm)
-{
-}
-
-/**
- * init_new_context - initialize context related info for new mm_struct instance
- * @tsk: pointer to a task struct
- * @mm: pointer to a new mm struct
- */
-static inline int init_new_context(struct task_struct *tsk,
-					struct mm_struct *mm)
-{
-	/* mm->context is set up by pgd_alloc */
-	return 0;
-}
 
 /*
  *  Switch active mm context
@@ -74,6 +48,7 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
 /*
  *  Activate new memory map for task
  */
+#define activate_mm activate_mm
 static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next)
 {
 	unsigned long flags;
@@ -86,4 +61,6 @@ static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next)
 /*  Generic hooks for arch_dup_mmap and arch_exit_mmap  */
 #include <asm-generic/mm_hooks.h>
 
+#include <asm-generic/mmu_context.h>
+
 #endif
-- 
2.23.0


^ permalink raw reply	[flat|nested] 35+ messages in thread

* [PATCH v3 08/23] ia64: use asm-generic/mmu_context.h for no-op implementations
  2020-09-01 14:15 [PATCH v3 00/23] Use asm-generic for mmu_context no-op functions Nicholas Piggin
                   ` (6 preceding siblings ...)
  2020-09-01 14:15 ` [PATCH v3 07/23] hexagon: " Nicholas Piggin
@ 2020-09-01 14:15 ` Nicholas Piggin
  2020-09-01 14:15 ` [PATCH v3 09/23] m68k: " Nicholas Piggin
                   ` (15 subsequent siblings)
  23 siblings, 0 replies; 35+ messages in thread
From: Nicholas Piggin @ 2020-09-01 14:15 UTC (permalink / raw)
  To: linux-arch
  Cc: Nicholas Piggin, linux-kernel, linux-mm, Arnd Bergmann,
	Tony Luck, Fenghua Yu, linux-ia64

Cc: Tony Luck <tony.luck@intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: linux-ia64@vger.kernel.org
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---

Please ack or nack if you object to this being mered via
Arnd's tree.

 arch/ia64/include/asm/mmu_context.h | 17 ++++-------------
 1 file changed, 4 insertions(+), 13 deletions(-)

diff --git a/arch/ia64/include/asm/mmu_context.h b/arch/ia64/include/asm/mmu_context.h
index 2da0e2eb036b..87a0d5bc11ef 100644
--- a/arch/ia64/include/asm/mmu_context.h
+++ b/arch/ia64/include/asm/mmu_context.h
@@ -49,11 +49,6 @@ DECLARE_PER_CPU(u8, ia64_need_tlb_flush);
 extern void mmu_context_init (void);
 extern void wrap_mmu_context (struct mm_struct *mm);
 
-static inline void
-enter_lazy_tlb (struct mm_struct *mm, struct task_struct *tsk)
-{
-}
-
 /*
  * When the context counter wraps around all TLBs need to be flushed because
  * an old context number might have been reused. This is signalled by the
@@ -116,6 +111,7 @@ get_mmu_context (struct mm_struct *mm)
  * Initialize context number to some sane value.  MM is guaranteed to be a
  * brand-new address-space, so no TLB flushing is needed, ever.
  */
+#define init_new_context init_new_context
 static inline int
 init_new_context (struct task_struct *p, struct mm_struct *mm)
 {
@@ -123,12 +119,6 @@ init_new_context (struct task_struct *p, struct mm_struct *mm)
 	return 0;
 }
 
-static inline void
-destroy_context (struct mm_struct *mm)
-{
-	/* Nothing to do.  */
-}
-
 static inline void
 reload_context (nv_mm_context_t context)
 {
@@ -178,11 +168,10 @@ activate_context (struct mm_struct *mm)
 	} while (unlikely(context != mm->context));
 }
 
-#define deactivate_mm(tsk,mm)	do { } while (0)
-
 /*
  * Switch from address space PREV to address space NEXT.
  */
+#define activate_mm activate_mm
 static inline void
 activate_mm (struct mm_struct *prev, struct mm_struct *next)
 {
@@ -196,5 +185,7 @@ activate_mm (struct mm_struct *prev, struct mm_struct *next)
 
 #define switch_mm(prev_mm,next_mm,next_task)	activate_mm(prev_mm, next_mm)
 
+#include <asm-generic/mmu_context.h>
+
 # endif /* ! __ASSEMBLY__ */
 #endif /* _ASM_IA64_MMU_CONTEXT_H */
-- 
2.23.0


^ permalink raw reply	[flat|nested] 35+ messages in thread

* [PATCH v3 09/23] m68k: use asm-generic/mmu_context.h for no-op implementations
  2020-09-01 14:15 [PATCH v3 00/23] Use asm-generic for mmu_context no-op functions Nicholas Piggin
                   ` (7 preceding siblings ...)
  2020-09-01 14:15 ` [PATCH v3 08/23] ia64: " Nicholas Piggin
@ 2020-09-01 14:15 ` Nicholas Piggin
  2020-09-01 14:15 ` [PATCH v3 10/23] microblaze: " Nicholas Piggin
                   ` (14 subsequent siblings)
  23 siblings, 0 replies; 35+ messages in thread
From: Nicholas Piggin @ 2020-09-01 14:15 UTC (permalink / raw)
  To: linux-arch
  Cc: Nicholas Piggin, linux-kernel, linux-mm, Arnd Bergmann,
	linux-m68k, Geert Uytterhoeven

Cc: linux-m68k@lists.linux-m68k.org
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
 arch/m68k/include/asm/mmu_context.h | 37 +++++++----------------------
 1 file changed, 9 insertions(+), 28 deletions(-)

diff --git a/arch/m68k/include/asm/mmu_context.h b/arch/m68k/include/asm/mmu_context.h
index 993fd7e37069..d12d8a9032f6 100644
--- a/arch/m68k/include/asm/mmu_context.h
+++ b/arch/m68k/include/asm/mmu_context.h
@@ -5,10 +5,6 @@
 #include <asm-generic/mm_hooks.h>
 #include <linux/mm_types.h>
 
-static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
-{
-}
-
 #ifdef CONFIG_MMU
 
 #if defined(CONFIG_COLDFIRE)
@@ -58,6 +54,7 @@ static inline void get_mmu_context(struct mm_struct *mm)
 /*
  * We're finished using the context for an address space.
  */
+#define destroy_context destroy_context
 static inline void destroy_context(struct mm_struct *mm)
 {
 	if (mm->context != NO_CONTEXT) {
@@ -83,6 +80,7 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
  * After we have set current->mm to a new value, this activates
  * the context for the new mm so we see the new mappings.
  */
+#define activate_mm activate_mm
 static inline void activate_mm(struct mm_struct *active_mm,
 	struct mm_struct *mm)
 {
@@ -90,8 +88,6 @@ static inline void activate_mm(struct mm_struct *active_mm,
 	set_context(mm->context, mm->pgd);
 }
 
-#define deactivate_mm(tsk, mm) do { } while (0)
-
 #define prepare_arch_switch(next) load_ksp_mmu(next)
 
 static inline void load_ksp_mmu(struct task_struct *task)
@@ -176,6 +172,7 @@ extern unsigned long get_free_context(struct mm_struct *mm);
 extern void clear_context(unsigned long context);
 
 /* set the context for a new task to unmapped */
+#define init_new_context init_new_context
 static inline int init_new_context(struct task_struct *tsk,
 				   struct mm_struct *mm)
 {
@@ -210,8 +207,7 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
 	activate_context(tsk->mm);
 }
 
-#define deactivate_mm(tsk, mm)	do { } while (0)
-
+#define activate_mm activate_mm
 static inline void activate_mm(struct mm_struct *prev_mm,
 			       struct mm_struct *next_mm)
 {
@@ -224,6 +220,7 @@ static inline void activate_mm(struct mm_struct *prev_mm,
 #include <asm/page.h>
 #include <asm/cacheflush.h>
 
+#define init_new_context init_new_context
 static inline int init_new_context(struct task_struct *tsk,
 				   struct mm_struct *mm)
 {
@@ -231,8 +228,6 @@ static inline int init_new_context(struct task_struct *tsk,
 	return 0;
 }
 
-#define destroy_context(mm)		do { } while(0)
-
 static inline void switch_mm_0230(struct mm_struct *mm)
 {
 	unsigned long crp[2] = {
@@ -300,8 +295,7 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, str
 	}
 }
 
-#define deactivate_mm(tsk,mm)	do { } while (0)
-
+#define activate_mm activate_mm
 static inline void activate_mm(struct mm_struct *prev_mm,
 			       struct mm_struct *next_mm)
 {
@@ -315,24 +309,11 @@ static inline void activate_mm(struct mm_struct *prev_mm,
 
 #endif
 
-#else /* !CONFIG_MMU */
-
-static inline int init_new_context(struct task_struct *tsk, struct mm_struct *mm)
-{
-	return 0;
-}
-
-
-static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, struct task_struct *tsk)
-{
-}
+#include <asm-generic/mmu_context.h>
 
-#define destroy_context(mm)	do { } while (0)
-#define deactivate_mm(tsk,mm)	do { } while (0)
+#else /* !CONFIG_MMU */
 
-static inline void activate_mm(struct mm_struct *prev_mm, struct mm_struct *next_mm)
-{
-}
+#include <asm-generic/nommu_context.h>
 
 #endif /* CONFIG_MMU */
 #endif /* __M68K_MMU_CONTEXT_H */
-- 
2.23.0


^ permalink raw reply	[flat|nested] 35+ messages in thread

* [PATCH v3 10/23] microblaze: use asm-generic/mmu_context.h for no-op implementations
  2020-09-01 14:15 [PATCH v3 00/23] Use asm-generic for mmu_context no-op functions Nicholas Piggin
                   ` (8 preceding siblings ...)
  2020-09-01 14:15 ` [PATCH v3 09/23] m68k: " Nicholas Piggin
@ 2020-09-01 14:15 ` Nicholas Piggin
  2020-09-01 14:15 ` [PATCH v3 11/23] mips: " Nicholas Piggin
                   ` (13 subsequent siblings)
  23 siblings, 0 replies; 35+ messages in thread
From: Nicholas Piggin @ 2020-09-01 14:15 UTC (permalink / raw)
  To: linux-arch
  Cc: Nicholas Piggin, linux-kernel, linux-mm, Arnd Bergmann, Michal Simek

Wire asm-generic/mmu_context.h to provide generic empty hooks for arch
code simplification.

Acked-by: Michal Simek <monstr@monstr.eu>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
 arch/microblaze/include/asm/mmu_context_mm.h | 8 ++++----
 arch/microblaze/include/asm/processor.h      | 3 ---
 2 files changed, 4 insertions(+), 7 deletions(-)

diff --git a/arch/microblaze/include/asm/mmu_context_mm.h b/arch/microblaze/include/asm/mmu_context_mm.h
index a1c7dd48454c..c2c77f708455 100644
--- a/arch/microblaze/include/asm/mmu_context_mm.h
+++ b/arch/microblaze/include/asm/mmu_context_mm.h
@@ -33,10 +33,6 @@
    to represent all kernel pages as shared among all contexts.
  */
 
-static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
-{
-}
-
 # define NO_CONTEXT	256
 # define LAST_CONTEXT	255
 # define FIRST_CONTEXT	1
@@ -105,6 +101,7 @@ static inline void get_mmu_context(struct mm_struct *mm)
 /*
  * We're finished using the context for an address space.
  */
+#define destroy_context destroy_context
 static inline void destroy_context(struct mm_struct *mm)
 {
 	if (mm->context != NO_CONTEXT) {
@@ -126,6 +123,7 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
  * After we have set current->mm to a new value, this activates
  * the context for the new mm so we see the new mappings.
  */
+#define activate_mm activate_mm
 static inline void activate_mm(struct mm_struct *active_mm,
 			struct mm_struct *mm)
 {
@@ -136,5 +134,7 @@ static inline void activate_mm(struct mm_struct *active_mm,
 
 extern void mmu_context_init(void);
 
+#include <asm-generic/mmu_context.h>
+
 # endif /* __KERNEL__ */
 #endif /* _ASM_MICROBLAZE_MMU_CONTEXT_H */
diff --git a/arch/microblaze/include/asm/processor.h b/arch/microblaze/include/asm/processor.h
index 1ff5a82b76b6..616211871a6e 100644
--- a/arch/microblaze/include/asm/processor.h
+++ b/arch/microblaze/include/asm/processor.h
@@ -122,9 +122,6 @@ unsigned long get_wchan(struct task_struct *p);
 #  define KSTK_EIP(task)	(task_pc(task))
 #  define KSTK_ESP(task)	(task_sp(task))
 
-/* FIXME */
-#  define deactivate_mm(tsk, mm)	do { } while (0)
-
 #  define STACK_TOP	TASK_SIZE
 #  define STACK_TOP_MAX	STACK_TOP
 
-- 
2.23.0


^ permalink raw reply	[flat|nested] 35+ messages in thread

* [PATCH v3 11/23] mips: use asm-generic/mmu_context.h for no-op implementations
  2020-09-01 14:15 [PATCH v3 00/23] Use asm-generic for mmu_context no-op functions Nicholas Piggin
                   ` (9 preceding siblings ...)
  2020-09-01 14:15 ` [PATCH v3 10/23] microblaze: " Nicholas Piggin
@ 2020-09-01 14:15 ` Nicholas Piggin
  2020-09-01 15:23   ` Thomas Bogendoerfer
  2020-09-01 14:15 ` [PATCH v3 12/23] nds32: " Nicholas Piggin
                   ` (12 subsequent siblings)
  23 siblings, 1 reply; 35+ messages in thread
From: Nicholas Piggin @ 2020-09-01 14:15 UTC (permalink / raw)
  To: linux-arch
  Cc: Nicholas Piggin, linux-kernel, linux-mm, Arnd Bergmann,
	Thomas Bogendoerfer, linux-mips

Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: linux-mips@vger.kernel.org
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---

Please ack or nack if you object to this being mered via
Arnd's tree.

 arch/mips/include/asm/mmu_context.h | 11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

diff --git a/arch/mips/include/asm/mmu_context.h b/arch/mips/include/asm/mmu_context.h
index cddead91acd4..ed9f2d748f63 100644
--- a/arch/mips/include/asm/mmu_context.h
+++ b/arch/mips/include/asm/mmu_context.h
@@ -124,10 +124,6 @@ static inline void set_cpu_context(unsigned int cpu,
 #define cpu_asid(cpu, mm) \
 	(cpu_context((cpu), (mm)) & cpu_asid_mask(&cpu_data[cpu]))
 
-static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
-{
-}
-
 extern void get_new_mmu_context(struct mm_struct *mm);
 extern void check_mmu_context(struct mm_struct *mm);
 extern void check_switch_mmu_context(struct mm_struct *mm);
@@ -136,6 +132,7 @@ extern void check_switch_mmu_context(struct mm_struct *mm);
  * Initialize the context related info for a new mm_struct
  * instance.
  */
+#define init_new_context init_new_context
 static inline int
 init_new_context(struct task_struct *tsk, struct mm_struct *mm)
 {
@@ -180,14 +177,12 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
  * Destroy context related info for an mm_struct that is about
  * to be put to rest.
  */
+#define destroy_context destroy_context
 static inline void destroy_context(struct mm_struct *mm)
 {
 	dsemul_mm_cleanup(mm);
 }
 
-#define activate_mm(prev, next)	switch_mm(prev, next, current)
-#define deactivate_mm(tsk, mm)	do { } while (0)
-
 static inline void
 drop_mmu_context(struct mm_struct *mm)
 {
@@ -237,4 +232,6 @@ drop_mmu_context(struct mm_struct *mm)
 	local_irq_restore(flags);
 }
 
+#include <asm-generic/mmu_context.h>
+
 #endif /* _ASM_MMU_CONTEXT_H */
-- 
2.23.0


^ permalink raw reply	[flat|nested] 35+ messages in thread

* [PATCH v3 12/23] nds32: use asm-generic/mmu_context.h for no-op implementations
  2020-09-01 14:15 [PATCH v3 00/23] Use asm-generic for mmu_context no-op functions Nicholas Piggin
                   ` (10 preceding siblings ...)
  2020-09-01 14:15 ` [PATCH v3 11/23] mips: " Nicholas Piggin
@ 2020-09-01 14:15 ` Nicholas Piggin
  2020-09-01 14:15 ` [PATCH v3 13/23] nios2: " Nicholas Piggin
                   ` (11 subsequent siblings)
  23 siblings, 0 replies; 35+ messages in thread
From: Nicholas Piggin @ 2020-09-01 14:15 UTC (permalink / raw)
  To: linux-arch
  Cc: Nicholas Piggin, linux-kernel, linux-mm, Arnd Bergmann, Nick Hu,
	Vincent Chen, Greentime Hu

Cc: Nick Hu <nickhu@andestech.com>
Cc: Vincent Chen <deanbo422@gmail.com>
Acked-by: Greentime Hu <green.hu@gmail.com>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
 arch/nds32/include/asm/mmu_context.h | 10 ++--------
 1 file changed, 2 insertions(+), 8 deletions(-)

diff --git a/arch/nds32/include/asm/mmu_context.h b/arch/nds32/include/asm/mmu_context.h
index b8fd3d189fdc..c651bc8cacdc 100644
--- a/arch/nds32/include/asm/mmu_context.h
+++ b/arch/nds32/include/asm/mmu_context.h
@@ -9,6 +9,7 @@
 #include <asm/proc-fns.h>
 #include <asm-generic/mm_hooks.h>
 
+#define init_new_context init_new_context
 static inline int
 init_new_context(struct task_struct *tsk, struct mm_struct *mm)
 {
@@ -16,8 +17,6 @@ init_new_context(struct task_struct *tsk, struct mm_struct *mm)
 	return 0;
 }
 
-#define destroy_context(mm)	do { } while(0)
-
 #define CID_BITS	9
 extern spinlock_t cid_lock;
 extern unsigned int cpu_last_cid;
@@ -47,10 +46,6 @@ static inline void check_context(struct mm_struct *mm)
 		__new_context(mm);
 }
 
-static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
-{
-}
-
 static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
 			     struct task_struct *tsk)
 {
@@ -62,7 +57,6 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
 	}
 }
 
-#define deactivate_mm(tsk,mm)	do { } while (0)
-#define activate_mm(prev,next)	switch_mm(prev, next, NULL)
+#include <asm-generic/mmu_context.h>
 
 #endif
-- 
2.23.0


^ permalink raw reply	[flat|nested] 35+ messages in thread

* [PATCH v3 13/23] nios2: use asm-generic/mmu_context.h for no-op implementations
  2020-09-01 14:15 [PATCH v3 00/23] Use asm-generic for mmu_context no-op functions Nicholas Piggin
                   ` (11 preceding siblings ...)
  2020-09-01 14:15 ` [PATCH v3 12/23] nds32: " Nicholas Piggin
@ 2020-09-01 14:15 ` Nicholas Piggin
  2020-09-01 14:15 ` [PATCH v3 14/23] openrisc: " Nicholas Piggin
                   ` (10 subsequent siblings)
  23 siblings, 0 replies; 35+ messages in thread
From: Nicholas Piggin @ 2020-09-01 14:15 UTC (permalink / raw)
  To: linux-arch
  Cc: Nicholas Piggin, linux-kernel, linux-mm, Arnd Bergmann, Ley Foon Tan

Cc: Ley Foon Tan <ley.foon.tan@intel.com>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---

Please ack or nack if you object to this being mered via
Arnd's tree.

 arch/nios2/include/asm/mmu_context.h | 21 ++++-----------------
 1 file changed, 4 insertions(+), 17 deletions(-)

diff --git a/arch/nios2/include/asm/mmu_context.h b/arch/nios2/include/asm/mmu_context.h
index 78ab3dacf579..4f99ed09b5a7 100644
--- a/arch/nios2/include/asm/mmu_context.h
+++ b/arch/nios2/include/asm/mmu_context.h
@@ -26,16 +26,13 @@ extern unsigned long get_pid_from_context(mm_context_t *ctx);
  */
 extern pgd_t *pgd_current;
 
-static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
-{
-}
-
 /*
  * Initialize the context related info for a new mm_struct instance.
  *
  * Set all new contexts to 0, that way the generation will never match
  * the currently running generation when this context is switched in.
  */
+#define init_new_context init_new_context
 static inline int init_new_context(struct task_struct *tsk,
 					struct mm_struct *mm)
 {
@@ -43,26 +40,16 @@ static inline int init_new_context(struct task_struct *tsk,
 	return 0;
 }
 
-/*
- * Destroy context related info for an mm_struct that is about
- * to be put to rest.
- */
-static inline void destroy_context(struct mm_struct *mm)
-{
-}
-
 void switch_mm(struct mm_struct *prev, struct mm_struct *next,
 		struct task_struct *tsk);
 
-static inline void deactivate_mm(struct task_struct *tsk,
-				struct mm_struct *mm)
-{
-}
-
 /*
  * After we have set current->mm to a new value, this activates
  * the context for the new mm so we see the new mappings.
  */
+#define activate_mm activate_mm
 void activate_mm(struct mm_struct *prev, struct mm_struct *next);
 
+#include <asm-generic/mmu_context.h>
+
 #endif /* _ASM_NIOS2_MMU_CONTEXT_H */
-- 
2.23.0


^ permalink raw reply	[flat|nested] 35+ messages in thread

* [PATCH v3 14/23] openrisc: use asm-generic/mmu_context.h for no-op implementations
  2020-09-01 14:15 [PATCH v3 00/23] Use asm-generic for mmu_context no-op functions Nicholas Piggin
                   ` (12 preceding siblings ...)
  2020-09-01 14:15 ` [PATCH v3 13/23] nios2: " Nicholas Piggin
@ 2020-09-01 14:15 ` Nicholas Piggin
  2020-09-01 14:15 ` [PATCH v3 15/23] parisc: " Nicholas Piggin
                   ` (9 subsequent siblings)
  23 siblings, 0 replies; 35+ messages in thread
From: Nicholas Piggin @ 2020-09-01 14:15 UTC (permalink / raw)
  To: linux-arch
  Cc: Nicholas Piggin, linux-kernel, linux-mm, Arnd Bergmann,
	Jonas Bonn, Stefan Kristiansson, Stafford Horne, openrisc

Cc: Jonas Bonn <jonas@southpole.se>
Cc: Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
Cc: Stafford Horne <shorne@gmail.com>
Cc: openrisc@lists.librecores.org
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---

Please ack or nack if you object to this being mered via
Arnd's tree.

 arch/openrisc/include/asm/mmu_context.h | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/arch/openrisc/include/asm/mmu_context.h b/arch/openrisc/include/asm/mmu_context.h
index ced577542e29..a6702384c77d 100644
--- a/arch/openrisc/include/asm/mmu_context.h
+++ b/arch/openrisc/include/asm/mmu_context.h
@@ -17,13 +17,13 @@
 
 #include <asm-generic/mm_hooks.h>
 
+#define init_new_context init_new_context
 extern int init_new_context(struct task_struct *tsk, struct mm_struct *mm);
+#define destroy_context destroy_context
 extern void destroy_context(struct mm_struct *mm);
 extern void switch_mm(struct mm_struct *prev, struct mm_struct *next,
 		      struct task_struct *tsk);
 
-#define deactivate_mm(tsk, mm)	do { } while (0)
-
 #define activate_mm(prev, next) switch_mm((prev), (next), NULL)
 
 /* current active pgd - this is similar to other processors pgd
@@ -32,8 +32,6 @@ extern void switch_mm(struct mm_struct *prev, struct mm_struct *next,
 
 extern volatile pgd_t *current_pgd[]; /* defined in arch/openrisc/mm/fault.c */
 
-static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
-{
-}
+#include <asm-generic/mmu_context.h>
 
 #endif
-- 
2.23.0


^ permalink raw reply	[flat|nested] 35+ messages in thread

* [PATCH v3 15/23] parisc: use asm-generic/mmu_context.h for no-op implementations
  2020-09-01 14:15 [PATCH v3 00/23] Use asm-generic for mmu_context no-op functions Nicholas Piggin
                   ` (13 preceding siblings ...)
  2020-09-01 14:15 ` [PATCH v3 14/23] openrisc: " Nicholas Piggin
@ 2020-09-01 14:15 ` Nicholas Piggin
  2020-09-01 14:15 ` [PATCH v3 16/23] powerpc: " Nicholas Piggin
                   ` (8 subsequent siblings)
  23 siblings, 0 replies; 35+ messages in thread
From: Nicholas Piggin @ 2020-09-01 14:15 UTC (permalink / raw)
  To: linux-arch
  Cc: Nicholas Piggin, linux-kernel, linux-mm, Arnd Bergmann,
	James E.J. Bottomley, linux-parisc, Helge Deller

Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>
Cc: linux-parisc@vger.kernel.org
Acked-by: Helge Deller <deller@gmx.de>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
 arch/parisc/include/asm/mmu_context.h | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/arch/parisc/include/asm/mmu_context.h b/arch/parisc/include/asm/mmu_context.h
index cb5f2f730421..46f8c22c5977 100644
--- a/arch/parisc/include/asm/mmu_context.h
+++ b/arch/parisc/include/asm/mmu_context.h
@@ -7,16 +7,13 @@
 #include <linux/atomic.h>
 #include <asm-generic/mm_hooks.h>
 
-static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
-{
-}
-
 /* on PA-RISC, we actually have enough contexts to justify an allocator
  * for them.  prumpf */
 
 extern unsigned long alloc_sid(void);
 extern void free_sid(unsigned long);
 
+#define init_new_context init_new_context
 static inline int
 init_new_context(struct task_struct *tsk, struct mm_struct *mm)
 {
@@ -26,6 +23,7 @@ init_new_context(struct task_struct *tsk, struct mm_struct *mm)
 	return 0;
 }
 
+#define destroy_context destroy_context
 static inline void
 destroy_context(struct mm_struct *mm)
 {
@@ -71,8 +69,7 @@ static inline void switch_mm(struct mm_struct *prev,
 }
 #define switch_mm_irqs_off switch_mm_irqs_off
 
-#define deactivate_mm(tsk,mm)	do { } while (0)
-
+#define activate_mm activate_mm
 static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next)
 {
 	/*
@@ -90,4 +87,7 @@ static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next)
 
 	switch_mm(prev,next,current);
 }
+
+#include <asm-generic/mmu_context.h>
+
 #endif
-- 
2.23.0


^ permalink raw reply	[flat|nested] 35+ messages in thread

* [PATCH v3 16/23] powerpc: use asm-generic/mmu_context.h for no-op implementations
  2020-09-01 14:15 [PATCH v3 00/23] Use asm-generic for mmu_context no-op functions Nicholas Piggin
                   ` (14 preceding siblings ...)
  2020-09-01 14:15 ` [PATCH v3 15/23] parisc: " Nicholas Piggin
@ 2020-09-01 14:15 ` Nicholas Piggin
  2020-09-01 14:15 ` [PATCH v3 17/23] riscv: " Nicholas Piggin
                   ` (7 subsequent siblings)
  23 siblings, 0 replies; 35+ messages in thread
From: Nicholas Piggin @ 2020-09-01 14:15 UTC (permalink / raw)
  To: linux-arch
  Cc: Nicholas Piggin, linux-kernel, linux-mm, Arnd Bergmann,
	linuxppc-dev, Michael Ellerman

Cc: linuxppc-dev@lists.ozlabs.org
Acked-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc)
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
 arch/powerpc/include/asm/mmu_context.h | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/arch/powerpc/include/asm/mmu_context.h b/arch/powerpc/include/asm/mmu_context.h
index 7f3658a97384..a3a12a8341b2 100644
--- a/arch/powerpc/include/asm/mmu_context.h
+++ b/arch/powerpc/include/asm/mmu_context.h
@@ -14,7 +14,9 @@
 /*
  * Most if the context management is out of line
  */
+#define init_new_context init_new_context
 extern int init_new_context(struct task_struct *tsk, struct mm_struct *mm);
+#define destroy_context destroy_context
 extern void destroy_context(struct mm_struct *mm);
 #ifdef CONFIG_SPAPR_TCE_IOMMU
 struct mm_iommu_table_group_mem_t;
@@ -235,27 +237,26 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
 }
 #define switch_mm_irqs_off switch_mm_irqs_off
 
-
-#define deactivate_mm(tsk,mm)	do { } while (0)
-
 /*
  * After we have set current->mm to a new value, this activates
  * the context for the new mm so we see the new mappings.
  */
+#define activate_mm activate_mm
 static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next)
 {
 	switch_mm(prev, next, current);
 }
 
 /* We don't currently use enter_lazy_tlb() for anything */
+#ifdef CONFIG_PPC_BOOK3E_64
+#define enter_lazy_tlb enter_lazy_tlb
 static inline void enter_lazy_tlb(struct mm_struct *mm,
 				  struct task_struct *tsk)
 {
 	/* 64-bit Book3E keeps track of current PGD in the PACA */
-#ifdef CONFIG_PPC_BOOK3E_64
 	get_paca()->pgd = NULL;
-#endif
 }
+#endif
 
 extern void arch_exit_mmap(struct mm_struct *mm);
 
@@ -298,5 +299,7 @@ static inline int arch_dup_mmap(struct mm_struct *oldmm,
 	return 0;
 }
 
+#include <asm-generic/mmu_context.h>
+
 #endif /* __KERNEL__ */
 #endif /* __ASM_POWERPC_MMU_CONTEXT_H */
-- 
2.23.0


^ permalink raw reply	[flat|nested] 35+ messages in thread

* [PATCH v3 17/23] riscv: use asm-generic/mmu_context.h for no-op implementations
  2020-09-01 14:15 [PATCH v3 00/23] Use asm-generic for mmu_context no-op functions Nicholas Piggin
                   ` (15 preceding siblings ...)
  2020-09-01 14:15 ` [PATCH v3 16/23] powerpc: " Nicholas Piggin
@ 2020-09-01 14:15 ` Nicholas Piggin
  2020-09-01 14:15 ` [PATCH v3 18/23] s390: " Nicholas Piggin
                   ` (6 subsequent siblings)
  23 siblings, 0 replies; 35+ messages in thread
From: Nicholas Piggin @ 2020-09-01 14:15 UTC (permalink / raw)
  To: linux-arch
  Cc: Nicholas Piggin, linux-kernel, linux-mm, Arnd Bergmann,
	Paul Walmsley, Palmer Dabbelt, Albert Ou, linux-riscv,
	Pekka Enberg, Palmer Dabbelt

Cc: Paul Walmsley <paul.walmsley@sifive.com>
Cc: Palmer Dabbelt <palmer@dabbelt.com>
Cc: Albert Ou <aou@eecs.berkeley.edu>
Cc: linux-riscv@lists.infradead.org
Reviewed-by: Pekka Enberg <penberg@kernel.org>
Acked-by: Palmer Dabbelt <palmerdabbelt@google.com>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
 arch/riscv/include/asm/mmu_context.h | 22 ++--------------------
 1 file changed, 2 insertions(+), 20 deletions(-)

diff --git a/arch/riscv/include/asm/mmu_context.h b/arch/riscv/include/asm/mmu_context.h
index 67c463812e2d..250defa06f3a 100644
--- a/arch/riscv/include/asm/mmu_context.h
+++ b/arch/riscv/include/asm/mmu_context.h
@@ -13,34 +13,16 @@
 #include <linux/mm.h>
 #include <linux/sched.h>
 
-static inline void enter_lazy_tlb(struct mm_struct *mm,
-	struct task_struct *task)
-{
-}
-
-/* Initialize context-related info for a new mm_struct */
-static inline int init_new_context(struct task_struct *task,
-	struct mm_struct *mm)
-{
-	return 0;
-}
-
-static inline void destroy_context(struct mm_struct *mm)
-{
-}
-
 void switch_mm(struct mm_struct *prev, struct mm_struct *next,
 	struct task_struct *task);
 
+#define activate_mm activate_mm
 static inline void activate_mm(struct mm_struct *prev,
 			       struct mm_struct *next)
 {
 	switch_mm(prev, next, NULL);
 }
 
-static inline void deactivate_mm(struct task_struct *task,
-	struct mm_struct *mm)
-{
-}
+#include <asm-generic/mmu_context.h>
 
 #endif /* _ASM_RISCV_MMU_CONTEXT_H */
-- 
2.23.0


^ permalink raw reply	[flat|nested] 35+ messages in thread

* [PATCH v3 18/23] s390: use asm-generic/mmu_context.h for no-op implementations
  2020-09-01 14:15 [PATCH v3 00/23] Use asm-generic for mmu_context no-op functions Nicholas Piggin
                   ` (16 preceding siblings ...)
  2020-09-01 14:15 ` [PATCH v3 17/23] riscv: " Nicholas Piggin
@ 2020-09-01 14:15 ` Nicholas Piggin
  2020-09-01 14:15 ` [PATCH v3 19/23] sh: " Nicholas Piggin
                   ` (5 subsequent siblings)
  23 siblings, 0 replies; 35+ messages in thread
From: Nicholas Piggin @ 2020-09-01 14:15 UTC (permalink / raw)
  To: linux-arch
  Cc: Nicholas Piggin, linux-kernel, linux-mm, Arnd Bergmann,
	Heiko Carstens, Vasily Gorbik, Christian Borntraeger, linux-s390

Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: linux-s390@vger.kernel.org
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---

Please ack or nack if you object to this being mered via
Arnd's tree.

 arch/s390/include/asm/mmu_context.h | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/arch/s390/include/asm/mmu_context.h b/arch/s390/include/asm/mmu_context.h
index c9f3d8a52756..66f9cf0a07e3 100644
--- a/arch/s390/include/asm/mmu_context.h
+++ b/arch/s390/include/asm/mmu_context.h
@@ -15,6 +15,7 @@
 #include <asm/ctl_reg.h>
 #include <asm-generic/mm_hooks.h>
 
+#define init_new_context init_new_context
 static inline int init_new_context(struct task_struct *tsk,
 				   struct mm_struct *mm)
 {
@@ -69,8 +70,6 @@ static inline int init_new_context(struct task_struct *tsk,
 	return 0;
 }
 
-#define destroy_context(mm)             do { } while (0)
-
 static inline void set_user_asce(struct mm_struct *mm)
 {
 	S390_lowcore.user_asce = mm->context.asce;
@@ -125,9 +124,7 @@ static inline void finish_arch_post_lock_switch(void)
 	set_fs(current->thread.mm_segment);
 }
 
-#define enter_lazy_tlb(mm,tsk)	do { } while (0)
-#define deactivate_mm(tsk,mm)	do { } while (0)
-
+#define activate_mm activate_mm
 static inline void activate_mm(struct mm_struct *prev,
                                struct mm_struct *next)
 {
@@ -136,4 +133,6 @@ static inline void activate_mm(struct mm_struct *prev,
 	set_user_asce(next);
 }
 
+#include <asm-generic/mmu_context.h>
+
 #endif /* __S390_MMU_CONTEXT_H */
-- 
2.23.0


^ permalink raw reply	[flat|nested] 35+ messages in thread

* [PATCH v3 19/23] sh: use asm-generic/mmu_context.h for no-op implementations
  2020-09-01 14:15 [PATCH v3 00/23] Use asm-generic for mmu_context no-op functions Nicholas Piggin
                   ` (17 preceding siblings ...)
  2020-09-01 14:15 ` [PATCH v3 18/23] s390: " Nicholas Piggin
@ 2020-09-01 14:15 ` Nicholas Piggin
  2020-09-03  5:57   ` Rich Felker
  2020-09-01 14:15 ` [PATCH v3 20/23] sparc: " Nicholas Piggin
                   ` (4 subsequent siblings)
  23 siblings, 1 reply; 35+ messages in thread
From: Nicholas Piggin @ 2020-09-01 14:15 UTC (permalink / raw)
  To: linux-arch
  Cc: Nicholas Piggin, linux-kernel, linux-mm, Arnd Bergmann,
	Yoshinori Sato, Rich Felker, linux-sh

Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Cc: Rich Felker <dalias@libc.org>
Cc: linux-sh@vger.kernel.org
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---

Please ack or nack if you object to this being mered via
Arnd's tree.

 arch/sh/include/asm/mmu_context.h    | 5 ++---
 arch/sh/include/asm/mmu_context_32.h | 9 ---------
 2 files changed, 2 insertions(+), 12 deletions(-)

diff --git a/arch/sh/include/asm/mmu_context.h b/arch/sh/include/asm/mmu_context.h
index 461b1304580b..78eef4e7d5df 100644
--- a/arch/sh/include/asm/mmu_context.h
+++ b/arch/sh/include/asm/mmu_context.h
@@ -84,6 +84,7 @@ static inline void get_mmu_context(struct mm_struct *mm, unsigned int cpu)
  * Initialize the context related info for a new mm_struct
  * instance.
  */
+#define init_new_context init_new_context
 static inline int init_new_context(struct task_struct *tsk,
 				   struct mm_struct *mm)
 {
@@ -120,9 +121,7 @@ static inline void switch_mm(struct mm_struct *prev,
 			activate_context(next, cpu);
 }
 
-#define activate_mm(prev, next)		switch_mm((prev),(next),NULL)
-#define deactivate_mm(tsk,mm)		do { } while (0)
-#define enter_lazy_tlb(mm,tsk)		do { } while (0)
+#include <asm-generic/mmu_context.h>
 
 #else
 
diff --git a/arch/sh/include/asm/mmu_context_32.h b/arch/sh/include/asm/mmu_context_32.h
index 71bf12ef1f65..bc5034fa6249 100644
--- a/arch/sh/include/asm/mmu_context_32.h
+++ b/arch/sh/include/asm/mmu_context_32.h
@@ -2,15 +2,6 @@
 #ifndef __ASM_SH_MMU_CONTEXT_32_H
 #define __ASM_SH_MMU_CONTEXT_32_H
 
-/*
- * Destroy context related info for an mm_struct that is about
- * to be put to rest.
- */
-static inline void destroy_context(struct mm_struct *mm)
-{
-	/* Do nothing */
-}
-
 #ifdef CONFIG_CPU_HAS_PTEAEX
 static inline void set_asid(unsigned long asid)
 {
-- 
2.23.0


^ permalink raw reply	[flat|nested] 35+ messages in thread

* [PATCH v3 20/23] sparc: use asm-generic/mmu_context.h for no-op implementations
  2020-09-01 14:15 [PATCH v3 00/23] Use asm-generic for mmu_context no-op functions Nicholas Piggin
                   ` (18 preceding siblings ...)
  2020-09-01 14:15 ` [PATCH v3 19/23] sh: " Nicholas Piggin
@ 2020-09-01 14:15 ` Nicholas Piggin
  2020-09-01 14:15 ` [PATCH v3 21/23] um: " Nicholas Piggin
                   ` (3 subsequent siblings)
  23 siblings, 0 replies; 35+ messages in thread
From: Nicholas Piggin @ 2020-09-01 14:15 UTC (permalink / raw)
  To: linux-arch
  Cc: Nicholas Piggin, linux-kernel, linux-mm, Arnd Bergmann,
	David S. Miller, sparclinux

Cc: "David S. Miller" <davem@davemloft.net>
Cc: sparclinux@vger.kernel.org
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---

Please ack or nack if you object to this being mered via
Arnd's tree.

 arch/sparc/include/asm/mmu_context_32.h | 10 ++++------
 arch/sparc/include/asm/mmu_context_64.h | 10 +++++-----
 2 files changed, 9 insertions(+), 11 deletions(-)

diff --git a/arch/sparc/include/asm/mmu_context_32.h b/arch/sparc/include/asm/mmu_context_32.h
index 7ddcb8badf70..509043f81560 100644
--- a/arch/sparc/include/asm/mmu_context_32.h
+++ b/arch/sparc/include/asm/mmu_context_32.h
@@ -6,13 +6,10 @@
 
 #include <asm-generic/mm_hooks.h>
 
-static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
-{
-}
-
 /* Initialize a new mmu context.  This is invoked when a new
  * address space instance (unique or shared) is instantiated.
  */
+#define init_new_context init_new_context
 int init_new_context(struct task_struct *tsk, struct mm_struct *mm);
 
 /* Destroy a dead context.  This occurs when mmput drops the
@@ -20,17 +17,18 @@ int init_new_context(struct task_struct *tsk, struct mm_struct *mm);
  * all the page tables have been flushed.  Our job is to destroy
  * any remaining processor-specific state.
  */
+#define destroy_context destroy_context
 void destroy_context(struct mm_struct *mm);
 
 /* Switch the current MM context. */
 void switch_mm(struct mm_struct *old_mm, struct mm_struct *mm,
 	       struct task_struct *tsk);
 
-#define deactivate_mm(tsk,mm)	do { } while (0)
-
 /* Activate a new MM instance for the current task. */
 #define activate_mm(active_mm, mm) switch_mm((active_mm), (mm), NULL)
 
+#include <asm-generic/mmu_context.h>
+
 #endif /* !(__ASSEMBLY__) */
 
 #endif /* !(__SPARC_MMU_CONTEXT_H) */
diff --git a/arch/sparc/include/asm/mmu_context_64.h b/arch/sparc/include/asm/mmu_context_64.h
index 312fcee8df2b..7a8380c63aab 100644
--- a/arch/sparc/include/asm/mmu_context_64.h
+++ b/arch/sparc/include/asm/mmu_context_64.h
@@ -16,17 +16,16 @@
 #include <asm-generic/mm_hooks.h>
 #include <asm/percpu.h>
 
-static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
-{
-}
-
 extern spinlock_t ctx_alloc_lock;
 extern unsigned long tlb_context_cache;
 extern unsigned long mmu_context_bmap[];
 
 DECLARE_PER_CPU(struct mm_struct *, per_cpu_secondary_mm);
 void get_new_mmu_context(struct mm_struct *mm);
+
+#define init_new_context init_new_context
 int init_new_context(struct task_struct *tsk, struct mm_struct *mm);
+#define destroy_context destroy_context
 void destroy_context(struct mm_struct *mm);
 
 void __tsb_context_switch(unsigned long pgd_pa,
@@ -136,7 +135,6 @@ static inline void switch_mm(struct mm_struct *old_mm, struct mm_struct *mm, str
 	spin_unlock_irqrestore(&mm->context.lock, flags);
 }
 
-#define deactivate_mm(tsk,mm)	do { } while (0)
 #define activate_mm(active_mm, mm) switch_mm(active_mm, mm, NULL)
 
 #define  __HAVE_ARCH_START_CONTEXT_SWITCH
@@ -187,6 +185,8 @@ static inline void finish_arch_post_lock_switch(void)
 	}
 }
 
+#include <asm-generic/mmu_context.h>
+
 #endif /* !(__ASSEMBLY__) */
 
 #endif /* !(__SPARC64_MMU_CONTEXT_H) */
-- 
2.23.0


^ permalink raw reply	[flat|nested] 35+ messages in thread

* [PATCH v3 21/23] um: use asm-generic/mmu_context.h for no-op implementations
  2020-09-01 14:15 [PATCH v3 00/23] Use asm-generic for mmu_context no-op functions Nicholas Piggin
                   ` (19 preceding siblings ...)
  2020-09-01 14:15 ` [PATCH v3 20/23] sparc: " Nicholas Piggin
@ 2020-09-01 14:15 ` Nicholas Piggin
  2020-09-01 14:15 ` [PATCH v3 22/23] x86: " Nicholas Piggin
                   ` (2 subsequent siblings)
  23 siblings, 0 replies; 35+ messages in thread
From: Nicholas Piggin @ 2020-09-01 14:15 UTC (permalink / raw)
  To: linux-arch
  Cc: Nicholas Piggin, linux-kernel, linux-mm, Arnd Bergmann,
	Jeff Dike, Richard Weinberger, Anton Ivanov, linux-um

Cc: Jeff Dike <jdike@addtoit.com>
Cc: Richard Weinberger <richard@nod.at>
Cc: Anton Ivanov <anton.ivanov@cambridgegreys.com>
Cc: linux-um@lists.infradead.org
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---

Please ack or nack if you object to this being mered via
Arnd's tree.

 arch/um/include/asm/mmu_context.h | 12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)

diff --git a/arch/um/include/asm/mmu_context.h b/arch/um/include/asm/mmu_context.h
index 17ddd4edf875..f8a100770691 100644
--- a/arch/um/include/asm/mmu_context.h
+++ b/arch/um/include/asm/mmu_context.h
@@ -37,10 +37,9 @@ static inline bool arch_vma_access_permitted(struct vm_area_struct *vma,
  * end asm-generic/mm_hooks.h functions
  */
 
-#define deactivate_mm(tsk,mm)	do { } while (0)
-
 extern void force_flush_all(void);
 
+#define activate_mm activate_mm
 static inline void activate_mm(struct mm_struct *old, struct mm_struct *new)
 {
 	/*
@@ -66,13 +65,12 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
 	}
 }
 
-static inline void enter_lazy_tlb(struct mm_struct *mm, 
-				  struct task_struct *tsk)
-{
-}
-
+#define init_new_context init_new_context
 extern int init_new_context(struct task_struct *task, struct mm_struct *mm);
 
+#define destroy_context destroy_context
 extern void destroy_context(struct mm_struct *mm);
 
+#include <asm-generic/mmu_context.h>
+
 #endif
-- 
2.23.0


^ permalink raw reply	[flat|nested] 35+ messages in thread

* [PATCH v3 22/23] x86: use asm-generic/mmu_context.h for no-op implementations
  2020-09-01 14:15 [PATCH v3 00/23] Use asm-generic for mmu_context no-op functions Nicholas Piggin
                   ` (20 preceding siblings ...)
  2020-09-01 14:15 ` [PATCH v3 21/23] um: " Nicholas Piggin
@ 2020-09-01 14:15 ` Nicholas Piggin
  2020-09-01 14:15 ` [PATCH v3 23/23] xtensa: " Nicholas Piggin
  2020-09-09 11:27 ` [PATCH v3 00/23] Use asm-generic for mmu_context no-op functions Arnd Bergmann
  23 siblings, 0 replies; 35+ messages in thread
From: Nicholas Piggin @ 2020-09-01 14:15 UTC (permalink / raw)
  To: linux-arch
  Cc: Nicholas Piggin, linux-kernel, linux-mm, Arnd Bergmann,
	Thomas Gleixner, Ingo Molnar, Borislav Petkov, x86,
	H. Peter Anvin, Peter Zijlstra

Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: x86@kernel.org
Cc: "H. Peter Anvin" <hpa@zytor.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
 arch/x86/include/asm/mmu_context.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/x86/include/asm/mmu_context.h b/arch/x86/include/asm/mmu_context.h
index d98016b83755..36afcbea6a9f 100644
--- a/arch/x86/include/asm/mmu_context.h
+++ b/arch/x86/include/asm/mmu_context.h
@@ -91,12 +91,14 @@ static inline void switch_ldt(struct mm_struct *prev, struct mm_struct *next)
 }
 #endif
 
+#define enter_lazy_tlb enter_lazy_tlb
 extern void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk);
 
 /*
  * Init a new mm.  Used on mm copies, like at fork()
  * and on mm's that are brand-new, like at execve().
  */
+#define init_new_context init_new_context
 static inline int init_new_context(struct task_struct *tsk,
 				   struct mm_struct *mm)
 {
@@ -116,6 +118,8 @@ static inline int init_new_context(struct task_struct *tsk,
 	init_new_context_ldt(mm);
 	return 0;
 }
+
+#define destroy_context destroy_context
 static inline void destroy_context(struct mm_struct *mm)
 {
 	destroy_context_ldt(mm);
@@ -214,4 +218,6 @@ static inline bool arch_vma_access_permitted(struct vm_area_struct *vma,
 
 unsigned long __get_current_cr3_fast(void);
 
+#include <asm-generic/mmu_context.h>
+
 #endif /* _ASM_X86_MMU_CONTEXT_H */
-- 
2.23.0


^ permalink raw reply	[flat|nested] 35+ messages in thread

* [PATCH v3 23/23] xtensa: use asm-generic/mmu_context.h for no-op implementations
  2020-09-01 14:15 [PATCH v3 00/23] Use asm-generic for mmu_context no-op functions Nicholas Piggin
                   ` (21 preceding siblings ...)
  2020-09-01 14:15 ` [PATCH v3 22/23] x86: " Nicholas Piggin
@ 2020-09-01 14:15 ` Nicholas Piggin
  2020-09-01 17:55   ` Max Filippov
  2020-09-09 11:27 ` [PATCH v3 00/23] Use asm-generic for mmu_context no-op functions Arnd Bergmann
  23 siblings, 1 reply; 35+ messages in thread
From: Nicholas Piggin @ 2020-09-01 14:15 UTC (permalink / raw)
  To: linux-arch
  Cc: Nicholas Piggin, linux-kernel, linux-mm, Arnd Bergmann,
	Chris Zankel, Max Filippov, linux-xtensa

Cc: Chris Zankel <chris@zankel.net>
Cc: Max Filippov <jcmvbkbc@gmail.com>
Cc: linux-xtensa@linux-xtensa.org
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---

Please ack or nack if you object to this being mered via
Arnd's tree.

 arch/xtensa/include/asm/mmu_context.h   | 11 +++--------
 arch/xtensa/include/asm/nommu_context.h | 26 +------------------------
 2 files changed, 4 insertions(+), 33 deletions(-)

diff --git a/arch/xtensa/include/asm/mmu_context.h b/arch/xtensa/include/asm/mmu_context.h
index 74923ef3b228..e337ba9686e9 100644
--- a/arch/xtensa/include/asm/mmu_context.h
+++ b/arch/xtensa/include/asm/mmu_context.h
@@ -111,6 +111,7 @@ static inline void activate_context(struct mm_struct *mm, unsigned int cpu)
  * to -1 says the process has never run on any core.
  */
 
+#define init_new_context init_new_context
 static inline int init_new_context(struct task_struct *tsk,
 		struct mm_struct *mm)
 {
@@ -136,24 +137,18 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
 		activate_context(next, cpu);
 }
 
-#define activate_mm(prev, next)	switch_mm((prev), (next), NULL)
-#define deactivate_mm(tsk, mm)	do { } while (0)
-
 /*
  * Destroy context related info for an mm_struct that is about
  * to be put to rest.
  */
+#define destroy_context destroy_context
 static inline void destroy_context(struct mm_struct *mm)
 {
 	invalidate_page_directory();
 }
 
 
-static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
-{
-	/* Nothing to do. */
-
-}
+#include <asm-generic/mmu_context.h>
 
 #endif /* CONFIG_MMU */
 #endif /* _XTENSA_MMU_CONTEXT_H */
diff --git a/arch/xtensa/include/asm/nommu_context.h b/arch/xtensa/include/asm/nommu_context.h
index 37251b2ef871..7c9d1918dc41 100644
--- a/arch/xtensa/include/asm/nommu_context.h
+++ b/arch/xtensa/include/asm/nommu_context.h
@@ -7,28 +7,4 @@ static inline void init_kio(void)
 {
 }
 
-static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
-{
-}
-
-static inline int init_new_context(struct task_struct *tsk,struct mm_struct *mm)
-{
-	return 0;
-}
-
-static inline void destroy_context(struct mm_struct *mm)
-{
-}
-
-static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next)
-{
-}
-
-static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
-				struct task_struct *tsk)
-{
-}
-
-static inline void deactivate_mm(struct task_struct *tsk, struct mm_struct *mm)
-{
-}
+#include <asm-generic/nommu_context.h>
-- 
2.23.0


^ permalink raw reply	[flat|nested] 35+ messages in thread

* Re: [PATCH v3 11/23] mips: use asm-generic/mmu_context.h for no-op implementations
  2020-09-01 14:15 ` [PATCH v3 11/23] mips: " Nicholas Piggin
@ 2020-09-01 15:23   ` Thomas Bogendoerfer
  0 siblings, 0 replies; 35+ messages in thread
From: Thomas Bogendoerfer @ 2020-09-01 15:23 UTC (permalink / raw)
  To: Nicholas Piggin
  Cc: linux-arch, linux-kernel, linux-mm, Arnd Bergmann, linux-mips

On Wed, Sep 02, 2020 at 12:15:27AM +1000, Nicholas Piggin wrote:
> Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
> Cc: linux-mips@vger.kernel.org
> Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
> ---
> 
> Please ack or nack if you object to this being mered via
> Arnd's tree.
> 
>  arch/mips/include/asm/mmu_context.h | 11 ++++-------
>  1 file changed, 4 insertions(+), 7 deletions(-)

Acked-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>

-- 
Crap can work. Given enough thrust pigs will fly, but it's not necessarily a
good idea.                                                [ RFC1925, 2.3 ]

^ permalink raw reply	[flat|nested] 35+ messages in thread

* Re: [PATCH v3 02/23] alpha: use asm-generic/mmu_context.h for no-op implementations
  2020-09-01 14:15 ` [PATCH v3 02/23] alpha: use asm-generic/mmu_context.h for no-op implementations Nicholas Piggin
@ 2020-09-01 16:51   ` Matt Turner
  0 siblings, 0 replies; 35+ messages in thread
From: Matt Turner @ 2020-09-01 16:51 UTC (permalink / raw)
  To: Nicholas Piggin
  Cc: Linux-Arch, LKML, linux-mm, Arnd Bergmann, Richard Henderson,
	Ivan Kokshaysky, linux-alpha

On Tue, Sep 1, 2020 at 7:15 AM Nicholas Piggin <npiggin@gmail.com> wrote:
>
> Cc: Richard Henderson <rth@twiddle.net>
> Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
> Cc: Matt Turner <mattst88@gmail.com>
> Cc: linux-alpha@vger.kernel.org
> Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
> ---
>
> Please ack or nack if you object to this being mered via
> Arnd's tree.

That would be great.

Acked-by: Matt Turner <mattst88@gmail.com>

^ permalink raw reply	[flat|nested] 35+ messages in thread

* Re: [PATCH v3 23/23] xtensa: use asm-generic/mmu_context.h for no-op implementations
  2020-09-01 14:15 ` [PATCH v3 23/23] xtensa: " Nicholas Piggin
@ 2020-09-01 17:55   ` Max Filippov
  0 siblings, 0 replies; 35+ messages in thread
From: Max Filippov @ 2020-09-01 17:55 UTC (permalink / raw)
  To: Nicholas Piggin
  Cc: Linux-Arch, LKML, Linux Memory Management List, Arnd Bergmann,
	Chris Zankel, open list:TENSILICA XTENSA PORT (xtensa)

On Tue, Sep 1, 2020 at 7:17 AM Nicholas Piggin <npiggin@gmail.com> wrote:
>
> Cc: Chris Zankel <chris@zankel.net>
> Cc: Max Filippov <jcmvbkbc@gmail.com>
> Cc: linux-xtensa@linux-xtensa.org
> Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
> ---
>
> Please ack or nack if you object to this being mered via
> Arnd's tree.
>
>  arch/xtensa/include/asm/mmu_context.h   | 11 +++--------
>  arch/xtensa/include/asm/nommu_context.h | 26 +------------------------
>  2 files changed, 4 insertions(+), 33 deletions(-)

Acked-by: Max Filippov <jcmvbkbc@gmail.com>

-- 
Thanks.
-- Max

^ permalink raw reply	[flat|nested] 35+ messages in thread

* Re: [PATCH v3 03/23] arc: use asm-generic/mmu_context.h for no-op implementations
  2020-09-01 14:15 ` [PATCH v3 03/23] arc: " Nicholas Piggin
@ 2020-09-01 18:32   ` Vineet Gupta
  0 siblings, 0 replies; 35+ messages in thread
From: Vineet Gupta @ 2020-09-01 18:32 UTC (permalink / raw)
  To: Nicholas Piggin, linux-arch
  Cc: linux-kernel, linux-mm, Arnd Bergmann, linux-snps-arc

On 9/1/20 7:15 AM, Nicholas Piggin wrote:
> Cc: Vineet Gupta <vgupta@synopsys.com>
> Cc: linux-snps-arc@lists.infradead.org
> Signed-off-by: Nicholas Piggin <npiggin@gmail.com>

Acked-by: Vineet Gupta <vgupta@synopsys.com>   #arch/arc

Thx,
-Vineet

> ---
> 
> Please ack or nack if you object to this being mered via
> Arnd's tree.
> 
>  arch/arc/include/asm/mmu_context.h | 17 +++++++++--------
>  1 file changed, 9 insertions(+), 8 deletions(-)
> 
> diff --git a/arch/arc/include/asm/mmu_context.h b/arch/arc/include/asm/mmu_context.h
> index 3a5e6a5b9ed6..df164066e172 100644
> --- a/arch/arc/include/asm/mmu_context.h
> +++ b/arch/arc/include/asm/mmu_context.h
> @@ -102,6 +102,7 @@ static inline void get_new_mmu_context(struct mm_struct *mm)
>   * Initialize the context related info for a new mm_struct
>   * instance.
>   */
> +#define init_new_context init_new_context
>  static inline int
>  init_new_context(struct task_struct *tsk, struct mm_struct *mm)
>  {
> @@ -113,6 +114,7 @@ init_new_context(struct task_struct *tsk, struct mm_struct *mm)
>  	return 0;
>  }
>  
> +#define destroy_context destroy_context
>  static inline void destroy_context(struct mm_struct *mm)
>  {
>  	unsigned long flags;
> @@ -153,13 +155,13 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
>  }
>  
>  /*
> - * Called at the time of execve() to get a new ASID
> - * Note the subtlety here: get_new_mmu_context() behaves differently here
> - * vs. in switch_mm(). Here it always returns a new ASID, because mm has
> - * an unallocated "initial" value, while in latter, it moves to a new ASID,
> - * only if it was unallocated
> + * activate_mm defaults (in asm-generic) to switch_mm and is called at the
> + * time of execve() to get a new ASID Note the subtlety here:
> + * get_new_mmu_context() behaves differently here vs. in switch_mm(). Here
> + * it always returns a new ASID, because mm has an unallocated "initial"
> + * value, while in latter, it moves to a new ASID, only if it was
> + * unallocated
>   */
> -#define activate_mm(prev, next)		switch_mm(prev, next, NULL)
>  
>  /* it seemed that deactivate_mm( ) is a reasonable place to do book-keeping
>   * for retiring-mm. However destroy_context( ) still needs to do that because
> @@ -168,8 +170,7 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
>   * there is a good chance that task gets sched-out/in, making it's ASID valid
>   * again (this teased me for a whole day).
>   */
> -#define deactivate_mm(tsk, mm)   do { } while (0)
>  
> -#define enter_lazy_tlb(mm, tsk)
> +#include <asm-generic/mmu_context.h>
>  
>  #endif /* __ASM_ARC_MMU_CONTEXT_H */
> 


^ permalink raw reply	[flat|nested] 35+ messages in thread

* Re: [PATCH v3 19/23] sh: use asm-generic/mmu_context.h for no-op implementations
  2020-09-01 14:15 ` [PATCH v3 19/23] sh: " Nicholas Piggin
@ 2020-09-03  5:57   ` Rich Felker
  0 siblings, 0 replies; 35+ messages in thread
From: Rich Felker @ 2020-09-03  5:57 UTC (permalink / raw)
  To: Nicholas Piggin
  Cc: linux-arch, linux-kernel, linux-mm, Arnd Bergmann,
	Yoshinori Sato, linux-sh

On Wed, Sep 02, 2020 at 12:15:35AM +1000, Nicholas Piggin wrote:
> Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
> Cc: Rich Felker <dalias@libc.org>
> Cc: linux-sh@vger.kernel.org
> Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
> ---
> 
> Please ack or nack if you object to this being mered via
> Arnd's tree.

Acked-by: Rich Felker <dalias@libc.org>

> 
>  arch/sh/include/asm/mmu_context.h    | 5 ++---
>  arch/sh/include/asm/mmu_context_32.h | 9 ---------
>  2 files changed, 2 insertions(+), 12 deletions(-)
> 
> diff --git a/arch/sh/include/asm/mmu_context.h b/arch/sh/include/asm/mmu_context.h
> index 461b1304580b..78eef4e7d5df 100644
> --- a/arch/sh/include/asm/mmu_context.h
> +++ b/arch/sh/include/asm/mmu_context.h
> @@ -84,6 +84,7 @@ static inline void get_mmu_context(struct mm_struct *mm, unsigned int cpu)
>   * Initialize the context related info for a new mm_struct
>   * instance.
>   */
> +#define init_new_context init_new_context
>  static inline int init_new_context(struct task_struct *tsk,
>  				   struct mm_struct *mm)
>  {
> @@ -120,9 +121,7 @@ static inline void switch_mm(struct mm_struct *prev,
>  			activate_context(next, cpu);
>  }
>  
> -#define activate_mm(prev, next)		switch_mm((prev),(next),NULL)
> -#define deactivate_mm(tsk,mm)		do { } while (0)
> -#define enter_lazy_tlb(mm,tsk)		do { } while (0)
> +#include <asm-generic/mmu_context.h>
>  
>  #else
>  
> diff --git a/arch/sh/include/asm/mmu_context_32.h b/arch/sh/include/asm/mmu_context_32.h
> index 71bf12ef1f65..bc5034fa6249 100644
> --- a/arch/sh/include/asm/mmu_context_32.h
> +++ b/arch/sh/include/asm/mmu_context_32.h
> @@ -2,15 +2,6 @@
>  #ifndef __ASM_SH_MMU_CONTEXT_32_H
>  #define __ASM_SH_MMU_CONTEXT_32_H
>  
> -/*
> - * Destroy context related info for an mm_struct that is about
> - * to be put to rest.
> - */
> -static inline void destroy_context(struct mm_struct *mm)
> -{
> -	/* Do nothing */
> -}
> -
>  #ifdef CONFIG_CPU_HAS_PTEAEX
>  static inline void set_asid(unsigned long asid)
>  {
> -- 
> 2.23.0

^ permalink raw reply	[flat|nested] 35+ messages in thread

* Re: [PATCH v3 00/23] Use asm-generic for mmu_context no-op functions
  2020-09-01 14:15 [PATCH v3 00/23] Use asm-generic for mmu_context no-op functions Nicholas Piggin
                   ` (22 preceding siblings ...)
  2020-09-01 14:15 ` [PATCH v3 23/23] xtensa: " Nicholas Piggin
@ 2020-09-09 11:27 ` Arnd Bergmann
  2020-10-09 14:01   ` Arnd Bergmann
  23 siblings, 1 reply; 35+ messages in thread
From: Arnd Bergmann @ 2020-09-09 11:27 UTC (permalink / raw)
  To: Nicholas Piggin, linux-arch; +Cc: Arnd Bergmann, linux-mm, linux-kernel

On Wed, 2 Sep 2020 00:15:16 +1000, Nicholas Piggin wrote:
> It would be nice to be able to modify mmu_context functions or add a
> hook without updating all architectures, many of which will be no-ops.
> 
> The motivation for this series is a change to lazy mmu handling, but
> this series stands on its own as a good cleanup whether or not we end
> up making that change.
> 
> [...]

Applied to asm-generic, thanks!

[01/23] asm-generic: add generic MMU versions of mmu context functions
        (no commit info)
[02/23] alpha: use asm-generic/mmu_context.h for no-op implementations
        (no commit info)
[03/23] arc: use asm-generic/mmu_context.h for no-op implementations
        (no commit info)
[04/23] arm: use asm-generic/mmu_context.h for no-op implementations
        (no commit info)
[05/23] arm64: use asm-generic/mmu_context.h for no-op implementations
        (no commit info)
[06/23] csky: use asm-generic/mmu_context.h for no-op implementations
        (no commit info)
[07/23] hexagon: use asm-generic/mmu_context.h for no-op implementations
        (no commit info)
[08/23] ia64: use asm-generic/mmu_context.h for no-op implementations
        (no commit info)
[09/23] m68k: use asm-generic/mmu_context.h for no-op implementations
        (no commit info)
[10/23] microblaze: use asm-generic/mmu_context.h for no-op implementations
        (no commit info)
[11/23] mips: use asm-generic/mmu_context.h for no-op implementations
        (no commit info)
[12/23] nds32: use asm-generic/mmu_context.h for no-op implementations
        (no commit info)
[13/23] nios2: use asm-generic/mmu_context.h for no-op implementations
        (no commit info)
[14/23] openrisc: use asm-generic/mmu_context.h for no-op implementations
        (no commit info)
[15/23] parisc: use asm-generic/mmu_context.h for no-op implementations
        (no commit info)
[16/23] powerpc: use asm-generic/mmu_context.h for no-op implementations
        (no commit info)
[17/23] riscv: use asm-generic/mmu_context.h for no-op implementations
        (no commit info)
[18/23] s390: use asm-generic/mmu_context.h for no-op implementations
        (no commit info)
[19/23] sh: use asm-generic/mmu_context.h for no-op implementations
        (no commit info)
[20/23] sparc: use asm-generic/mmu_context.h for no-op implementations
        (no commit info)
[21/23] um: use asm-generic/mmu_context.h for no-op implementations
        (no commit info)
[22/23] x86: use asm-generic/mmu_context.h for no-op implementations
        (no commit info)
[23/23] xtensa: use asm-generic/mmu_context.h for no-op implementations
        (no commit info)

       Arnd

^ permalink raw reply	[flat|nested] 35+ messages in thread

* Re: [PATCH v3 00/23] Use asm-generic for mmu_context no-op functions
  2020-09-09 11:27 ` [PATCH v3 00/23] Use asm-generic for mmu_context no-op functions Arnd Bergmann
@ 2020-10-09 14:01   ` Arnd Bergmann
  2020-10-10  2:02     ` Stephen Rothwell
  0 siblings, 1 reply; 35+ messages in thread
From: Arnd Bergmann @ 2020-10-09 14:01 UTC (permalink / raw)
  To: Nicholas Piggin, linux-arch; +Cc: Linux-MM, linux-kernel, Stephen Rothwell

On Wed, Sep 9, 2020 at 1:27 PM Arnd Bergmann <arnd@arndb.de> wrote:
>
> On Wed, 2 Sep 2020 00:15:16 +1000, Nicholas Piggin wrote:
> > It would be nice to be able to modify mmu_context functions or add a
> > hook without updating all architectures, many of which will be no-ops.
> >
> > The motivation for this series is a change to lazy mmu handling, but
> > this series stands on its own as a good cleanup whether or not we end
> > up making that change.
> >
> > [...]
>
> Applied to asm-generic, thanks!

Hi Nick,

I just noticed a fatal mistake I made when pushing it to the branch on
kernel.org: I used to have both a 'master' and an 'asm-generic' branch
in asm-generic.git but tried to remove the 'master' one as there is not
really any point in having two.

Unfortunately I forgot to check which one of the two was part of
linux-next, and it was the other one, so none of the patches I picked
up ever saw any wider testing aside from the 0day bot building it
(successfully).

Are there other changes that depend on this? If not, I would
just wait until -rc1 and then either push the branch correctly or
rebase the patches on that first, to avoid pushing something that
did not see the necessary testing.

      Arnd

^ permalink raw reply	[flat|nested] 35+ messages in thread

* Re: [PATCH v3 00/23] Use asm-generic for mmu_context no-op functions
  2020-10-09 14:01   ` Arnd Bergmann
@ 2020-10-10  2:02     ` Stephen Rothwell
  2020-10-10  8:25       ` Arnd Bergmann
  0 siblings, 1 reply; 35+ messages in thread
From: Stephen Rothwell @ 2020-10-10  2:02 UTC (permalink / raw)
  To: Arnd Bergmann; +Cc: Nicholas Piggin, linux-arch, Linux-MM, linux-kernel


[-- Attachment #1: Type: text/plain, Size: 1646 bytes --]

Hi Arnd,

On Fri, 9 Oct 2020 16:01:22 +0200 Arnd Bergmann <arnd@arndb.de> wrote:
>
> On Wed, Sep 9, 2020 at 1:27 PM Arnd Bergmann <arnd@arndb.de> wrote:
> >
> > On Wed, 2 Sep 2020 00:15:16 +1000, Nicholas Piggin wrote:  
> > > It would be nice to be able to modify mmu_context functions or add a
> > > hook without updating all architectures, many of which will be no-ops.
> > >
> > > The motivation for this series is a change to lazy mmu handling, but
> > > this series stands on its own as a good cleanup whether or not we end
> > > up making that change.
> > >
> > > [...]  
> >
> > Applied to asm-generic, thanks!  
> 
> Hi Nick,
> 
> I just noticed a fatal mistake I made when pushing it to the branch on
> kernel.org: I used to have both a 'master' and an 'asm-generic' branch
> in asm-generic.git but tried to remove the 'master' one as there is not
> really any point in having two.
> 
> Unfortunately I forgot to check which one of the two was part of
> linux-next, and it was the other one, so none of the patches I picked
> up ever saw any wider testing aside from the 0day bot building it
> (successfully).
> 
> Are there other changes that depend on this? If not, I would
> just wait until -rc1 and then either push the branch correctly or
> rebase the patches on that first, to avoid pushing something that
> did not see the necessary testing.

If it is useful enough (or important enough), then put in in your
linux-next included branch, but don't ask Linus to merge it until the
second week of the merge window ... no worse than some other stuff I
see :-(

-- 
Cheers,
Stephen Rothwell

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^ permalink raw reply	[flat|nested] 35+ messages in thread

* Re: [PATCH v3 00/23] Use asm-generic for mmu_context no-op functions
  2020-10-10  2:02     ` Stephen Rothwell
@ 2020-10-10  8:25       ` Arnd Bergmann
  2020-10-10 19:00         ` Stephen Rothwell
  2020-10-19  1:00         ` Nicholas Piggin
  0 siblings, 2 replies; 35+ messages in thread
From: Arnd Bergmann @ 2020-10-10  8:25 UTC (permalink / raw)
  To: Stephen Rothwell; +Cc: Nicholas Piggin, linux-arch, Linux-MM, linux-kernel

On Sat, Oct 10, 2020 at 4:02 AM Stephen Rothwell <sfr@canb.auug.org.au> wrote:
> On Fri, 9 Oct 2020 16:01:22 +0200 Arnd Bergmann <arnd@arndb.de> wrote:
>
> > Are there other changes that depend on this? If not, I would
> > just wait until -rc1 and then either push the branch correctly or
> > rebase the patches on that first, to avoid pushing something that
> > did not see the necessary testing.
>
> If it is useful enough (or important enough), then put in in your
> linux-next included branch, but don't ask Linus to merge it until the
> second week of the merge window ... no worse than some other stuff I
> see :-(

By itself, it's a nice cleanup, but it doesn't provide any immediate
benefit over the previous state, while potentially introducing a
regression in one of the less tested architectures.

The question to me is really whether Nick has any pending work
that he would like to submit after this branch is merged into
mainline.

    Arnd

^ permalink raw reply	[flat|nested] 35+ messages in thread

* Re: [PATCH v3 00/23] Use asm-generic for mmu_context no-op functions
  2020-10-10  8:25       ` Arnd Bergmann
@ 2020-10-10 19:00         ` Stephen Rothwell
  2020-10-19  1:00         ` Nicholas Piggin
  1 sibling, 0 replies; 35+ messages in thread
From: Stephen Rothwell @ 2020-10-10 19:00 UTC (permalink / raw)
  To: Arnd Bergmann; +Cc: Nicholas Piggin, linux-arch, Linux-MM, linux-kernel


[-- Attachment #1: Type: text/plain, Size: 1137 bytes --]

Hi Arnd,

On Sat, 10 Oct 2020 10:25:11 +0200 Arnd Bergmann <arnd@arndb.de> wrote:
>
> On Sat, Oct 10, 2020 at 4:02 AM Stephen Rothwell <sfr@canb.auug.org.au> wrote:
> > On Fri, 9 Oct 2020 16:01:22 +0200 Arnd Bergmann <arnd@arndb.de> wrote:
> >  
> > > Are there other changes that depend on this? If not, I would
> > > just wait until -rc1 and then either push the branch correctly or
> > > rebase the patches on that first, to avoid pushing something that
> > > did not see the necessary testing.  
> >
> > If it is useful enough (or important enough), then put in in your
> > linux-next included branch, but don't ask Linus to merge it until the
> > second week of the merge window ... no worse than some other stuff I
> > see :-(  
> 
> By itself, it's a nice cleanup, but it doesn't provide any immediate
> benefit over the previous state, while potentially introducing a
> regression in one of the less tested architectures.

OK.

> The question to me is really whether Nick has any pending work
> that he would like to submit after this branch is merged into
> mainline.

-- 
Cheers,
Stephen Rothwell

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^ permalink raw reply	[flat|nested] 35+ messages in thread

* Re: [PATCH v3 00/23] Use asm-generic for mmu_context no-op functions
  2020-10-10  8:25       ` Arnd Bergmann
  2020-10-10 19:00         ` Stephen Rothwell
@ 2020-10-19  1:00         ` Nicholas Piggin
  1 sibling, 0 replies; 35+ messages in thread
From: Nicholas Piggin @ 2020-10-19  1:00 UTC (permalink / raw)
  To: Arnd Bergmann, Stephen Rothwell; +Cc: linux-arch, linux-kernel, Linux-MM

Excerpts from Arnd Bergmann's message of October 10, 2020 6:25 pm:
> On Sat, Oct 10, 2020 at 4:02 AM Stephen Rothwell <sfr@canb.auug.org.au> wrote:
>> On Fri, 9 Oct 2020 16:01:22 +0200 Arnd Bergmann <arnd@arndb.de> wrote:
>>
>> > Are there other changes that depend on this? If not, I would
>> > just wait until -rc1 and then either push the branch correctly or
>> > rebase the patches on that first, to avoid pushing something that
>> > did not see the necessary testing.
>>
>> If it is useful enough (or important enough), then put in in your
>> linux-next included branch, but don't ask Linus to merge it until the
>> second week of the merge window ... no worse than some other stuff I
>> see :-(
> 
> By itself, it's a nice cleanup, but it doesn't provide any immediate
> benefit over the previous state, while potentially introducing a
> regression in one of the less tested architectures.
> 
> The question to me is really whether Nick has any pending work
> that he would like to submit after this branch is merged into
> mainline.

Not for this merge window but I was hoping to submit something for
improving lazy tlb handling in the next one.

Thanks,
Nick

^ permalink raw reply	[flat|nested] 35+ messages in thread

end of thread, back to index

Thread overview: 35+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-09-01 14:15 [PATCH v3 00/23] Use asm-generic for mmu_context no-op functions Nicholas Piggin
2020-09-01 14:15 ` [PATCH v3 01/23] asm-generic: add generic MMU versions of mmu context functions Nicholas Piggin
2020-09-01 14:15 ` [PATCH v3 02/23] alpha: use asm-generic/mmu_context.h for no-op implementations Nicholas Piggin
2020-09-01 16:51   ` Matt Turner
2020-09-01 14:15 ` [PATCH v3 03/23] arc: " Nicholas Piggin
2020-09-01 18:32   ` Vineet Gupta
2020-09-01 14:15 ` [PATCH v3 04/23] arm: " Nicholas Piggin
2020-09-01 14:15 ` [PATCH v3 05/23] arm64: " Nicholas Piggin
2020-09-01 14:15 ` [PATCH v3 06/23] csky: " Nicholas Piggin
2020-09-01 14:15 ` [PATCH v3 07/23] hexagon: " Nicholas Piggin
2020-09-01 14:15 ` [PATCH v3 08/23] ia64: " Nicholas Piggin
2020-09-01 14:15 ` [PATCH v3 09/23] m68k: " Nicholas Piggin
2020-09-01 14:15 ` [PATCH v3 10/23] microblaze: " Nicholas Piggin
2020-09-01 14:15 ` [PATCH v3 11/23] mips: " Nicholas Piggin
2020-09-01 15:23   ` Thomas Bogendoerfer
2020-09-01 14:15 ` [PATCH v3 12/23] nds32: " Nicholas Piggin
2020-09-01 14:15 ` [PATCH v3 13/23] nios2: " Nicholas Piggin
2020-09-01 14:15 ` [PATCH v3 14/23] openrisc: " Nicholas Piggin
2020-09-01 14:15 ` [PATCH v3 15/23] parisc: " Nicholas Piggin
2020-09-01 14:15 ` [PATCH v3 16/23] powerpc: " Nicholas Piggin
2020-09-01 14:15 ` [PATCH v3 17/23] riscv: " Nicholas Piggin
2020-09-01 14:15 ` [PATCH v3 18/23] s390: " Nicholas Piggin
2020-09-01 14:15 ` [PATCH v3 19/23] sh: " Nicholas Piggin
2020-09-03  5:57   ` Rich Felker
2020-09-01 14:15 ` [PATCH v3 20/23] sparc: " Nicholas Piggin
2020-09-01 14:15 ` [PATCH v3 21/23] um: " Nicholas Piggin
2020-09-01 14:15 ` [PATCH v3 22/23] x86: " Nicholas Piggin
2020-09-01 14:15 ` [PATCH v3 23/23] xtensa: " Nicholas Piggin
2020-09-01 17:55   ` Max Filippov
2020-09-09 11:27 ` [PATCH v3 00/23] Use asm-generic for mmu_context no-op functions Arnd Bergmann
2020-10-09 14:01   ` Arnd Bergmann
2020-10-10  2:02     ` Stephen Rothwell
2020-10-10  8:25       ` Arnd Bergmann
2020-10-10 19:00         ` Stephen Rothwell
2020-10-19  1:00         ` Nicholas Piggin

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