Thread (13 messages) 13 messages, 4 authors, 2014-08-04

Re: [PATCH v13 6/8] arm: add pmd_[dirty|mkclean] for THP

From: Steve Capper <hidden>
Date: 2014-07-18 14:54:32
Also in: linux-arm-kernel, linux-mm, lkml

On Fri, Jul 18, 2014 at 03:53:04PM +0900, Minchan Kim wrote:
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 <redacted>
Cc: Will Deacon <redacted>
Cc: Steve Capper <redacted>
Cc: Russell King <linux-lFZ/pmaqli7XmaaqVzeoHQ@public.gmane.org>
Cc: linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org
Signed-off-by: Minchan Kim <redacted>
This patch looks good to me:
Acked-by: Steve Capper <redacted>

There is another patch that introduces a helper function to test for
pmd bits, please see below.
quoted hunk ↗ jump to hunk
---
 arch/arm/include/asm/pgtable-3level.h | 3 +++
 1 file changed, 3 insertions(+)
diff --git a/arch/arm/include/asm/pgtable-3level.h b/arch/arm/include/asm/pgtable-3level.h
index 85c60adc8b60..830f84f2d277 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)		(pmd_val(pmd) & PMD_SECT_DIRTY)
Russell,
Should this be folded into my {pte|pmd}_isset patch?
http://lists.infradead.org/pipermail/linux-arm-kernel/2014-July/268979.html

Cheers,
-- 
Steve

quoted hunk ↗ jump to hunk
+
 #define PMD_BIT_FUNC(fn,op) \
 static inline pmd_t pmd_##fn(pmd_t pmd) { pmd_val(pmd) op; return pmd; }
 
@@ -228,6 +230,7 @@ PMD_BIT_FUNC(mkold,	&= ~PMD_SECT_AF);
 PMD_BIT_FUNC(mksplitting, |= PMD_SECT_SPLITTING);
 PMD_BIT_FUNC(mkwrite,   &= ~PMD_SECT_RDONLY);
 PMD_BIT_FUNC(mkdirty,   |= PMD_SECT_DIRTY);
+PMD_BIT_FUNC(mkclean,   &= ~PMD_SECT_DIRTY);
 PMD_BIT_FUNC(mkyoung,   |= PMD_SECT_AF);
 
 #define pmd_mkhuge(pmd)		(__pmd(pmd_val(pmd) & ~PMD_TABLE_BIT))
-- 
2.0.0
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