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| author |   David S. Miller <davem@davemloft.net> | 2014-04-25 10:21:12 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2014-05-03 22:32:37 -0700 |
| commit | 04df419de34104d8818b8c5cffaa062fa36d20ea (patch) | |
| tree | 35f20c565e3d6797ed9638e688e4e911251da011 | |
| parent | sparc64: Fix huge PMD invalidation. (diff) | |
| download | linux-dev-04df419de34104d8818b8c5cffaa062fa36d20ea.tar.xz linux-dev-04df419de34104d8818b8c5cffaa062fa36d20ea.zip | |
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>
| -rw-r--r-- | arch/sparc/include/asm/pgtable_64.h | 2 | ||||
| -rw-r--r-- | arch/sparc/mm/gup.c | 2 |
2 files changed, 2 insertions, 2 deletions
diff --git a/arch/sparc/include/asm/pgtable_64.h b/arch/sparc/include/asm/pgtable_64.h index e3db4b8e689b..1f281030769c 100644 --- a/arch/sparc/include/asm/pgtable_64.h +++ b/arch/sparc/include/asm/pgtable_64.h @@ -633,7 +633,7 @@ static inline unsigned long pmd_large(pmd_t pmd) { pte_t pte = __pte(pmd_val(pmd)); - return (pte_val(pte) & _PAGE_PMD_HUGE) && pte_present(pte); + return pte_val(pte) & _PAGE_PMD_HUGE; } #ifdef CONFIG_TRANSPARENT_HUGEPAGE diff --git a/arch/sparc/mm/gup.c b/arch/sparc/mm/gup.c index c4d3da68b800..1aed0432c64b 100644 --- a/arch/sparc/mm/gup.c +++ b/arch/sparc/mm/gup.c @@ -73,7 +73,7 @@ static int gup_huge_pmd(pmd_t *pmdp, pmd_t pmd, unsigned long addr, struct page *head, *page, *tail; int refs; - if (!pmd_large(pmd)) + if (!(pmd_val(pmd) & _PAGE_VALID)) return 0; if (write && !pmd_write(pmd)) |