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powerpc: Update gup_pmd_range to handle transparent hugepages 

Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Aneesh Kumar K.V 2013-06-20 14:30:20 +05:30 committed by Benjamin Herrenschmidt
parent db7cb5b924
commit c367714ce8
1 changed files with 8 additions and 2 deletions
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10
arch/powerpc/mm/gup.c
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@ -66,9 +66,15 @@ static int gup_pmd_range(pud_t pud, unsigned long addr, unsigned long end,
pmd_t pmd = *pmdp;
next = pmd_addr_end(addr, end);
if (pmd_none(pmd))
/*
* If we find a splitting transparent hugepage we
* return zero. That will result in taking the slow
* path which will call wait_split_huge_page()
* if the pmd is still in splitting state
*/
if (pmd_none(pmd) || pmd_trans_splitting(pmd))
return 0;
if (pmd_huge(pmd)) {
if (pmd_huge(pmd) || pmd_large(pmd)) {
if (!gup_hugepte((pte_t *)pmdp, PMD_SIZE, addr, next,
write, pages, nr))
return 0;