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Commitc489f12

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hnaztorvalds
authored andcommitted
thp: add pmd_modify
Add pmd_modify() for use with mprotect() on huge pmds.Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>Reviewed-by: Rik van Riel <riel@redhat.com>Signed-off-by: Andrew Morton <akpm@linux-foundation.org>Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1 parent0ca1634 commitc489f12

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‎arch/x86/include/asm/pgtable.h‎

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@@ -325,6 +325,16 @@ static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
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return__pte(val);
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}
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staticinlinepmd_tpmd_modify(pmd_tpmd,pgprot_tnewprot)
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{
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pmdval_tval=pmd_val(pmd);
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val &=_HPAGE_CHG_MASK;
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val |=massage_pgprot(newprot)& ~_HPAGE_CHG_MASK;
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return__pmd(val);
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}
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/* mprotect needs to preserve PAT bits when updating vm_page_prot */
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#definepgprot_modify pgprot_modify
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staticinlinepgprot_tpgprot_modify(pgprot_toldprot,pgprot_tnewprot)

‎arch/x86/include/asm/pgtable_types.h‎

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@@ -72,6 +72,7 @@
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/* Set of bits not changed in pte_modify */
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#define_PAGE_CHG_MASK(PTE_PFN_MASK | _PAGE_PCD | _PAGE_PWT |\
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_PAGE_SPECIAL | _PAGE_ACCESSED | _PAGE_DIRTY)
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#define_HPAGE_CHG_MASK (_PAGE_CHG_MASK | _PAGE_PSE)
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#define_PAGE_CACHE_MASK(_PAGE_PCD | _PAGE_PWT)
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#define_PAGE_CACHE_WB(0)

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