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s390/mm: enable gup code for NUMA 

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

Signed-off-by: Gerald Schaefer <geraldsc@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Gerald Schaefer 2015-05-29 15:34:51 +02:00 committed by Martin Schwidefsky
parent b54565b868
commit ecf46abdd3
1 changed files with 10 additions and 0 deletions
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10
arch/s390/mm/gup.c
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@ -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;