From: Bibo Mao <maobibo@loongson.cn>
To: "Thomas Bogendoerfer" <tsbogend@alpha.franken.de>,
"Jiaxun Yang" <jiaxun.yang@flygoat.com>,
"Huacai Chen" <chenhc@lemote.com>,
"Andrew Morton" <akpm@linux-foundation.org>,
"Paul Burton" <paulburton@kernel.org>,
"Dmitry Korotin" <dkorotin@wavecomp.com>,
"Philippe Mathieu-Daudé" <f4bug@amsat.org>,
"Stafford Horne" <shorne@gmail.com>,
"Steven Price" <steven.price@arm.com>,
"Anshuman Khandual" <anshuman.khandual@arm.com>
Cc: linux-mips@vger.kernel.org, linux-kernel@vger.kernel.org,
Mike Rapoport <rppt@linux.ibm.com>,
Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>,
"Maciej W. Rozycki" <macro@wdc.com>,
linux-mm@kvack.org, David Hildenbrand <david@redhat.com>
Subject: [PATCH v4 4/4] MIPS: mm: add page valid judgement in function pte_modify
Date: Tue, 19 May 2020 18:03:30 +0800 [thread overview]
Message-ID: <1589882610-7291-4-git-send-email-maobibo@loongson.cn> (raw)
In-Reply-To: <1589882610-7291-1-git-send-email-maobibo@loongson.cn>
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>
---
arch/mips/include/asm/pgtable.h | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/arch/mips/include/asm/pgtable.h b/arch/mips/include/asm/pgtable.h
index 755d534..4f6eb56 100644
--- a/arch/mips/include/asm/pgtable.h
+++ b/arch/mips/include/asm/pgtable.h
@@ -509,8 +509,11 @@ 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
--
1.8.3.1
prev parent reply other threads:[~2020-05-19 10:04 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-19 10:03 [PATCH v4 1/4] MIPS: Do not flush tlb page when updating PTE entry Bibo Mao
2020-05-19 10:03 ` [PATCH v4 2/4] mm/memory.c: Update local TLB if PTE entry exists Bibo Mao
2020-05-20 1:26 ` Andrew Morton
2020-05-20 6:39 ` maobibo
2020-05-21 0:54 ` Andrew Morton
2020-05-19 10:03 ` [PATCH v4 3/4] mm/memory.c: Add memory read privilege on page fault handling Bibo Mao
2020-05-20 1:30 ` Andrew Morton
2020-05-20 8:22 ` maobibo
2020-05-19 10:03 ` Bibo Mao [this message]
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