Commit 273b5fa0 authored by Bibo Mao's avatar Bibo Mao Committed by Thomas Bogendoerfer
Browse files

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: default avatarBibo Mao <maobibo@loongson.cn>
Signed-off-by: default avatarThomas Bogendoerfer <tsbogend@alpha.franken.de>
parent 44bf431b

arch/mips/include/asm/pgtable.h

+5 −2
Original line number Diff line number Diff line
@@ -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

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