Hello Steve,

On Tue, Jul 08, 2014 at 12:37:38PM +0100, Steve Capper wrote:

On Tue, Jul 08, 2014 at 03:03:43PM +0900, Minchan Kim wrote:

quoted

MADV_FREE needs pmd_dirty and pmd_mkclean for detecting recent
overwrite of the contents since MADV_FREE syscall is called for
THP page.

This patch adds pmd_dirty and pmd_mkclean for THP page MADV_FREE
support.

Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <redacted>
Cc: Steve Capper <redacted>
Cc: Russell King <redacted>
Cc: linux-arm-kernel@lists.infradead.org
Signed-off-by: Minchan Kim <minchan@kernel.org>
---
 arch/arm/include/asm/pgtable-3level.h | 3 +++
 arch/arm64/include/asm/pgtable.h      | 2 ++
 2 files changed, 5 insertions(+)

Hi Minchan,
arch/arm and arch/arm64 are handled separately.
Could you please split this patch into arm and arm64 versions?

Sure.

quoted

diff --git a/arch/arm/include/asm/pgtable-3level.h b/arch/arm/include/asm/pgtable-3level.h
index 85c60adc8b60..3a7bb8dc7d05 100644
--- a/arch/arm/include/asm/pgtable-3level.h
+++ b/arch/arm/include/asm/pgtable-3level.h

@@ -220,6 +220,8 @@ static inline pmd_t *pmd_offset(pud_t *pud, unsigned long addr)
 #define pmd_trans_splitting(pmd) (pmd_val(pmd) & PMD_SECT_SPLITTING)
 #endif
 
+#define pmd_dirty	(pmd_val(pmd) & PMD_SECT_DIRTY)

This macro is missing the parameter definition, and will generate a
compile errror when CONFIG_ARM_LPAE=y

For 32-bit ARM with CONFIG_ARM_LPAE=n, we don't have THP support and I noticed
some compiler errors in mm/madvise.c:

  CC      mm/madvise.o
mm/madvise.c: In function ‘madvise_free_pte_range’:
mm/madvise.c:279:3: error: implicit declaration of function ‘pmdp_get_and_clear’ [-Werror=implicit-function-declaration]
   orig_pmd = pmdp_get_and_clear(mm, addr, pmd);
   ^
mm/madvise.c:285:3: error: implicit declaration of function ‘pmd_mkold’ [-Werror=implicit-function-declaration]
   orig_pmd = pmd_mkold(orig_pmd);
   ^
mm/madvise.c:286:3: error: implicit declaration of function ‘pmd_mkclean’ [-Werror=implicit-function-declaration]
   orig_pmd = pmd_mkclean(orig_pmd);
   ^
mm/madvise.c:288:3: error: implicit declaration of function ‘set_pmd_at’ [-Werror=implicit-function-declaration]
   set_pmd_at(mm, addr, pmd, orig_pmd);
   ^
cc1: some warnings being treated as errors
make[1]: *** [mm/madvise.o] Error 1

Oops, will fix.

Thanks for the review!

Cheers,
-- 
Steve 

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-- 
Kind regards,
Minchan Kim

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