From: Huacai Chen chenhuacai@loongson.cn
[ Upstream commit 54e6cd42a183b602e3627ad3aaeeed44f7443e67 ]
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 Signed-off-by: Sasha Levin sashal@kernel.org --- arch/loongarch/include/asm/pgtable.h | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/arch/loongarch/include/asm/pgtable.h b/arch/loongarch/include/asm/pgtable.h index 8ea57e2f0e04..79981ee8a171 100644 --- a/arch/loongarch/include/asm/pgtable.h +++ b/arch/loongarch/include/asm/pgtable.h @@ -355,7 +355,9 @@ 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; }
@@ -452,7 +454,9 @@ 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; }