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LoongArch: Set _PAGE_DIRTY only if _PAGE_MODIFIED is set in {pmd,pte}_mkwrite()

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Set _PAGE_DIRTY only if _PAGE_MODIFIED is set in {pmd,pte}_mkwrite().
Otherwise, _PAGE_DIRTY silences the TLB modify exception and make us
have no chance to mark a pmd/pte dirty (_PAGE_MODIFIED) for software.

Reviewed-by: Guo Ren <guoren@kernel.org>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
This commit is contained in:
Huacai Chen 2022-11-21 19:02:57 +08:00
parent bf2f34a506
commit 54e6cd42a1
1 changed files with 6 additions and 2 deletions
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8
arch/loongarch/include/asm/pgtable.h
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@ -357,7 +357,9 @@ static inline pte_t pte_mkdirty(pte_t pte)
static inline pte_t pte_mkwrite(pte_t pte)
{
pte_val(pte) |= (_PAGE_WRITE | _PAGE_DIRTY);
pte_val(pte) |= _PAGE_WRITE;
if (pte_val(pte) & _PAGE_MODIFIED)
pte_val(pte) |= _PAGE_DIRTY;
return pte;
}
@ -457,7 +459,9 @@ static inline int pmd_write(pmd_t pmd)
static inline pmd_t pmd_mkwrite(pmd_t pmd)
{
pmd_val(pmd) |= (_PAGE_WRITE | _PAGE_DIRTY);
pmd_val(pmd) |= _PAGE_WRITE;
if (pmd_val(pmd) & _PAGE_MODIFIED)
pmd_val(pmd) |= _PAGE_DIRTY;
return pmd;
}