Commit ecf46abd authored by Gerald Schaefer's avatar Gerald Schaefer Committed by Martin Schwidefsky
Browse files

s390/mm: enable gup code for NUMA 



Force get_user_page() to take the slow path for NUMA migration pages.

Signed-off-by: default avatarGerald Schaefer <geraldsc@linux.vnet.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent b54565b8

arch/s390/mm/gup.c

+10 −0
Original line number Diff line number Diff line
@@ -30,6 +30,9 @@ static inline int gup_pte_range(pmd_t *pmdp, pmd_t pmd, unsigned long addr, 
	do {

		pte = *ptep;

		barrier();

		/* Similar to the PMD case, NUMA hinting must take slow path */

		if (pte_protnone(pte))

			return 0;

		if ((pte_val(pte) & mask) != 0)

			return 0;

		VM_BUG_ON(!pfn_valid(pte_pfn(pte)));
@@ -125,6 +128,13 @@ static inline int gup_pmd_range(pud_t *pudp, pud_t pud, unsigned long addr, 
		if (pmd_none(pmd) || pmd_trans_splitting(pmd))

			return 0;

		if (unlikely(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_protnone(pmd))

				return 0;

			if (!gup_huge_pmd(pmdp, pmd, addr, next,

					  write, pages, nr))

				return 0;