Commit 1dc954bd authored by Aneesh Kumar K.V's avatar Aneesh Kumar K.V Committed by Benjamin Herrenschmidt
Browse files

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: default avatarAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
parent 9000c17d

arch/powerpc/mm/gup.c

+13 −0
Original line number Diff line number Diff line
@@ -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;