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arm64: Fix pte_modify() to preserve the hardware dirty information 

The pte_modify() function with hardware AF/DBM enabled must transfer the
hardware dirty information to the software PTE_DIRTY bit. However, it
was setting this bit in newprot and the mask does not cover such bit.
This patch sets PTE_DIRTY on the original pte which will be preserved in
the returned value.

Fixes: 2f4b829c62 ("arm64: Add support for hardware updates of the access and dirty pte bits")
Cc: Julien Grall <julien.grall@citrix.com>
Tested-by: Julien Grall <julien.grall@citrix.com>
Tested-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Catalin Marinas 2015-09-11 18:22:01 +01:00 committed by Will Deacon
parent b847415ce9
commit 62d96c71d2
1 changed files with 1 additions and 1 deletions
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2
arch/arm64/include/asm/pgtable.h
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@ -503,7 +503,7 @@ static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
PTE_PROT_NONE | PTE_WRITE | PTE_TYPE_MASK;
/* preserve the hardware dirty information */
if (pte_hw_dirty(pte))
newprot |= PTE_DIRTY;
pte = pte_mkdirty(pte);
pte_val(pte) = (pte_val(pte) & ~mask) | (pgprot_val(newprot) & mask);
return pte;
}