powerpc/mm: NUMA pte should be handled via slow path in get_user_pages_fast()
We need to handle numa pte via the slow path Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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@ -36,6 +36,11 @@ static noinline int gup_pte_range(pmd_t pmd, unsigned long addr,
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do {
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pte_t pte = ACCESS_ONCE(*ptep);
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struct page *page;
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/*
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* Similar to the PMD case, NUMA hinting must take slow path
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*/
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if (pte_numa(pte))
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return 0;
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if ((pte_val(pte) & mask) != result)
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return 0;
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@ -75,6 +80,14 @@ static int gup_pmd_range(pud_t pud, unsigned long addr, unsigned long end,
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if (pmd_none(pmd) || pmd_trans_splitting(pmd))
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return 0;
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if (pmd_huge(pmd) || pmd_large(pmd)) {
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/*
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* NUMA hinting faults need to be handled in the GUP
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* slowpath for accounting purposes and so that they
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* can be serialised against THP migration.
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*/
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if (pmd_numa(pmd))
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return 0;
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if (!gup_hugepte((pte_t *)pmdp, PMD_SIZE, addr, next,
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write, pages, nr))
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return 0;
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