path: root/arch/sparc/mm
diff options
authorNaoya Horiguchi <>2014-06-04 16:05:35 -0700
committerLinus Torvalds <>2014-06-04 16:53:51 -0700
commitc177c81e09e517bbf75b67762cdab1b83aba6976 (patch)
tree569aed2a30badb1ce3e5393de74b43eeeb22e376 /arch/sparc/mm
parent7f39dda9d86fb4f4f17af0de170decf125726f8c (diff)
hugetlb: restrict hugepage_migration_support() to x86_64
Currently hugepage migration is available for all archs which support pmd-level hugepage, but testing is done only for x86_64 and there're bugs for other archs. So to avoid breaking such archs, this patch limits the availability strictly to x86_64 until developers of other archs get interested in enabling this feature. Simply disabling hugepage migration on non-x86_64 archs is not enough to fix the reported problem where sys_move_pages() hits the BUG_ON() in follow_page(FOLL_GET), so let's fix this by checking if hugepage migration is supported in vma_migratable(). Signed-off-by: Naoya Horiguchi <> Reported-by: Michael Ellerman <> Tested-by: Michael Ellerman <> Acked-by: Hugh Dickins <> Cc: Benjamin Herrenschmidt <> Cc: Tony Luck <> Cc: Russell King <> Cc: Martin Schwidefsky <> Cc: James Hogan <> Cc: Ralf Baechle <> Cc: David Miller <> Cc: <> [3.12+] Signed-off-by: Andrew Morton <> Signed-off-by: Linus Torvalds <>
Diffstat (limited to 'arch/sparc/mm')
1 files changed, 0 insertions, 5 deletions
diff --git a/arch/sparc/mm/hugetlbpage.c b/arch/sparc/mm/hugetlbpage.c
index 9bd9ce80bf77..d329537739c6 100644
--- a/arch/sparc/mm/hugetlbpage.c
+++ b/arch/sparc/mm/hugetlbpage.c
@@ -231,11 +231,6 @@ int pud_huge(pud_t pud)
return 0;
-int pmd_huge_support(void)
- return 0;
struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
pmd_t *pmd, int write)