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MIPS: mm: add page valid judgement in function pte_modify 

If original PTE has _PAGE_ACCESSED bit set, and new pte has no
_PAGE_NO_READ bit set, we can add _PAGE_SILENT_READ bit to enable
page valid bit.

Signed-off-by: Bibo Mao <maobibo@loongson.cn>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
This commit is contained in:
Bibo Mao 2020-05-27 10:25:20 +08:00 committed by Thomas Bogendoerfer
parent 44bf431b47
commit 273b5fa00f
1 changed files with 5 additions and 2 deletions
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7
arch/mips/include/asm/pgtable.h
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@ -532,8 +532,11 @@ static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
#else
static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
{
return __pte((pte_val(pte) & _PAGE_CHG_MASK) |
(pgprot_val(newprot) & ~_PAGE_CHG_MASK));
pte_val(pte) &= _PAGE_CHG_MASK;
pte_val(pte) |= pgprot_val(newprot) & ~_PAGE_CHG_MASK;
if ((pte_val(pte) & _PAGE_ACCESSED) && !(pte_val(pte) & _PAGE_NO_READ))
pte_val(pte) |= _PAGE_SILENT_READ;
return pte;
}
#endif