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| author | Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> | 2014-04-02 16:07:39 (GMT) |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2014-04-09 02:53:03 (GMT) |
| commit | 1dc954bd2f85144b9a2959139d41a5f6b9b34712 (patch) | |
| tree | cb15e3d36f636f85d6a22dced47152c7c561d030 /arch | |
| parent | 9000c17dc0f9c910267d2661225c9d33a227b27e (diff) | |
| download | linux-1dc954bd2f85144b9a2959139d41a5f6b9b34712.tar.xz | |
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>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/powerpc/mm/gup.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/arch/powerpc/mm/gup.c b/arch/powerpc/mm/gup.c index c5f734e..d874668 100644 --- a/arch/powerpc/mm/gup.c +++ b/arch/powerpc/mm/gup.c @@ -36,6 +36,11 @@ static noinline int gup_pte_range(pmd_t pmd, unsigned long addr, do { pte_t pte = ACCESS_ONCE(*ptep); struct page *page; + /* + * Similar to the PMD case, NUMA hinting must take slow path + */ + if (pte_numa(pte)) + return 0; if ((pte_val(pte) & mask) != result) return 0; @@ -75,6 +80,14 @@ static int gup_pmd_range(pud_t pud, unsigned long addr, unsigned long end, if (pmd_none(pmd) || pmd_trans_splitting(pmd)) return 0; if (pmd_huge(pmd) || pmd_large(pmd)) { + /* + * NUMA hinting faults need to be handled in the GUP + * slowpath for accounting purposes and so that they + * can be serialised against THP migration. + */ + if (pmd_numa(pmd)) + return 0; + if (!gup_hugepte((pte_t *)pmdp, PMD_SIZE, addr, next, write, pages, nr)) return 0; |