On Wed, 2014-04-02 at 21:37 +0530, Aneesh Kumar K.V wrote:
> From: "Aneesh Kumar K.V" <aneesh.ku...@linux.vnet.ibm.com>
>
> We need to handle numa pte via the slow path
Is this -stable material ? If yes how far back ?
Cheers,
Ben.
> Signed-off-by: Aneesh Kumar K.V <aneesh.ku...@linux.vnet.ibm.com>
> ---
> arch/powerpc/mm/gup.c | 13 +++++++++++++
> 1 file changed, 13 insertions(+)
>
> diff --git a/arch/powerpc/mm/gup.c b/arch/powerpc/mm/gup.c
> index c5f734e20b0f..d8746684f606 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;
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