[PATCHv2] x86/mm: Drop unneeded __always_inline for p4d page table helpers

[PATCHv2] x86/mm: Drop unneeded __always_inline for p4d page table helpers

[Kirill A. Shutemov]

This reverts commits

  1ea66554d3b0 ("x86/mm: Mark p4d_offset() __always_inline")
  046c0dbec023 ("x86: Mark native_set_p4d() as __always_inline")

p4d_offset(), native_set_p4d() and native_p4d_clear() were marked
__always_inline in attempt to move __pgtable_l5_enabled into __initdata
section.

It was required as KASAN initialization code is a user of
USE_EARLY_PGTABLE_L5, so all pgtable_l5_enabled() translated to
__pgtable_l5_enabled there. This includes pgtable_l5_enabled() called
from inline p4d helpers.

If compiler would decided to not inline these p4d helpers, but leave
them standalone, we end up with section mismatch.

We don't need __always_inline here anymore. __pgtable_l5_enabled moved
back to be __ro_after_init. See commit

  51be13351517 ("Revert "x86/mm: Mark __pgtable_l5_enabled __initdata"")

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Arnd Bergmann <arnd@arndb.de>
---
 arch/x86/include/asm/pgtable.h    | 2 +-
 arch/x86/include/asm/pgtable_64.h | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
index 99ecde23c3ec..5715647fc4fe 100644
--- a/arch/x86/include/asm/pgtable.h
+++ b/arch/x86/include/asm/pgtable.h
@@ -898,7 +898,7 @@ static inline unsigned long pgd_page_vaddr(pgd_t pgd)
 #define pgd_page(pgd)	pfn_to_page(pgd_pfn(pgd))
 
 /* to find an entry in a page-table-directory. */
-static __always_inline p4d_t *p4d_offset(pgd_t *pgd, unsigned long address)
+static inline p4d_t *p4d_offset(pgd_t *pgd, unsigned long address)
 {
 	if (!pgtable_l5_enabled())
 		return (p4d_t *)pgd;
diff --git a/arch/x86/include/asm/pgtable_64.h b/arch/x86/include/asm/pgtable_64.h
index 0fdcd21dadbd..3c5385f9a88f 100644
--- a/arch/x86/include/asm/pgtable_64.h
+++ b/arch/x86/include/asm/pgtable_64.h
@@ -216,7 +216,7 @@ static inline pgd_t pti_set_user_pgd(pgd_t *pgdp, pgd_t pgd)
 }
 #endif
 
-static __always_inline void native_set_p4d(p4d_t *p4dp, p4d_t p4d)
+static inline void native_set_p4d(p4d_t *p4dp, p4d_t p4d)
 {
 	pgd_t pgd;
 
@@ -230,7 +230,7 @@ static __always_inline void native_set_p4d(p4d_t *p4dp, p4d_t p4d)
 	*p4dp = native_make_p4d(native_pgd_val(pgd));
 }
 
-static __always_inline void native_p4d_clear(p4d_t *p4d)
+static inline void native_p4d_clear(p4d_t *p4d)
 {
 	native_set_p4d(p4d, native_make_p4d(0));
 }
-- 
2.18.0

[tip:x86/urgent] x86/mm: Drop unneeded __always_inline for p4d page table helpers

[tip-bot for Kirill A. Shutemov]

Commit-ID:  b8c1e4293a5d1dfd19ab7b0984bfce8191940500
Gitweb:     https://git.kernel.org/tip/b8c1e4293a5d1dfd19ab7b0984bfce8191940500
Author:     Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
AuthorDate: Tue, 26 Jun 2018 13:03:41 +0300
Committer:  Ingo Molnar <mingo@kernel.org>
CommitDate: Wed, 27 Jun 2018 09:55:26 +0200

x86/mm: Drop unneeded __always_inline for p4d page table helpers

This reverts the following commits:

  1ea66554d3b0 ("x86/mm: Mark p4d_offset() __always_inline")
  046c0dbec023 ("x86: Mark native_set_p4d() as __always_inline")

p4d_offset(), native_set_p4d() and native_p4d_clear() were marked
__always_inline in attempt to move __pgtable_l5_enabled into __initdata
section.

It was required as KASAN initialization code is a user of
USE_EARLY_PGTABLE_L5, so all pgtable_l5_enabled() translated to
__pgtable_l5_enabled there. This includes pgtable_l5_enabled() called
from inline p4d helpers.

If compiler would decided to not inline these p4d helpers, but leave
them standalone, we end up with section mismatch.

We don't need __always_inline here anymore. __pgtable_l5_enabled moved
back to be __ro_after_init. See the following commit:

  51be13351517 ("Revert "x86/mm: Mark __pgtable_l5_enabled __initdata"")

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20180626100341.49910-1-kirill.shutemov@linux.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
 arch/x86/include/asm/pgtable.h    | 2 +-
 arch/x86/include/asm/pgtable_64.h | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
index 99ecde23c3ec..5715647fc4fe 100644
--- a/arch/x86/include/asm/pgtable.h
+++ b/arch/x86/include/asm/pgtable.h
@@ -898,7 +898,7 @@ static inline unsigned long pgd_page_vaddr(pgd_t pgd)
 #define pgd_page(pgd)	pfn_to_page(pgd_pfn(pgd))
 
 /* to find an entry in a page-table-directory. */
-static __always_inline p4d_t *p4d_offset(pgd_t *pgd, unsigned long address)
+static inline p4d_t *p4d_offset(pgd_t *pgd, unsigned long address)
 {
 	if (!pgtable_l5_enabled())
 		return (p4d_t *)pgd;
diff --git a/arch/x86/include/asm/pgtable_64.h b/arch/x86/include/asm/pgtable_64.h
index 0fdcd21dadbd..3c5385f9a88f 100644
--- a/arch/x86/include/asm/pgtable_64.h
+++ b/arch/x86/include/asm/pgtable_64.h
@@ -216,7 +216,7 @@ static inline pgd_t pti_set_user_pgd(pgd_t *pgdp, pgd_t pgd)
 }
 #endif
 
-static __always_inline void native_set_p4d(p4d_t *p4dp, p4d_t p4d)
+static inline void native_set_p4d(p4d_t *p4dp, p4d_t p4d)
 {
 	pgd_t pgd;
 
@@ -230,7 +230,7 @@ static __always_inline void native_set_p4d(p4d_t *p4dp, p4d_t p4d)
 	*p4dp = native_make_p4d(native_pgd_val(pgd));
 }
 
-static __always_inline void native_p4d_clear(p4d_t *p4d)
+static inline void native_p4d_clear(p4d_t *p4d)
 {
 	native_set_p4d(p4d, native_make_p4d(0));
 }