sparc64: Fix bugs in get_user_pages_fast() wrt. THP.
The large PMD path needs to check _PAGE_VALID not _PAGE_PRESENT, to decide if it needs to bail and return 0. pmd_large() should therefore just check _PAGE_PMD_HUGE. Calls to gup_huge_pmd() are guarded with a check of pmd_large(), so we just need to add a valid bit check. Signed-off-by: David S. Miller <davem@davemloft.net>
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2 changed files with 2 additions and 2 deletions
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@ -633,7 +633,7 @@ static inline unsigned long pmd_large(pmd_t pmd)
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{
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pte_t pte = __pte(pmd_val(pmd));
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return (pte_val(pte) & _PAGE_PMD_HUGE) && pte_present(pte);
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return pte_val(pte) & _PAGE_PMD_HUGE;
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}
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#ifdef CONFIG_TRANSPARENT_HUGEPAGE
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@ -73,7 +73,7 @@ static int gup_huge_pmd(pmd_t *pmdp, pmd_t pmd, unsigned long addr,
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struct page *head, *page, *tail;
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int refs;
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if (!pmd_large(pmd))
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if (!(pmd_val(pmd) & _PAGE_VALID))
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return 0;
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if (write && !pmd_write(pmd))
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