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authorHugh Dickins <hughd@google.com>2016-05-19 17:12:54 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2016-05-19 19:12:14 -0700
commitbf8616d5fa179d6c755f06726567c6d63c6fbbc7 (patch)
treee9bb568bea162e3f66da723d09d21449638b3878 /mm/huge_memory.c
parent52b6f46bc163eef17ecba4cd552beeafe2b24453 (diff)
downloadlwn-bf8616d5fa179d6c755f06726567c6d63c6fbbc7.tar.gz
lwn-bf8616d5fa179d6c755f06726567c6d63c6fbbc7.zip
huge mm: move_huge_pmd does not need new_vma
Remove move_huge_pmd()'s redundant new_vma arg: all it was used for was a VM_NOHUGEPAGE check on new_vma flags, but the new_vma is cloned from the old vma, so a trans_huge_pmd in the new_vma will be as acceptable as it was in the old vma, alignment and size permitting. Signed-off-by: Hugh Dickins <hughd@google.com> Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Andres Lagar-Cavilla <andreslc@google.com> Cc: Yang Shi <yang.shi@linaro.org> Cc: Ning Qu <quning@gmail.com> Cc: Mel Gorman <mgorman@techsingularity.net> Cc: Andres Lagar-Cavilla <andreslc@google.com> Cc: Konstantin Khlebnikov <koct9i@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/huge_memory.c')
-rw-r--r--mm/huge_memory.c7
1 files changed, 2 insertions, 5 deletions
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index f8ac8f582fd8..66675eed67be 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1698,20 +1698,17 @@ int zap_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma,
return 1;
}
-bool move_huge_pmd(struct vm_area_struct *vma, struct vm_area_struct *new_vma,
- unsigned long old_addr,
+bool move_huge_pmd(struct vm_area_struct *vma, unsigned long old_addr,
unsigned long new_addr, unsigned long old_end,
pmd_t *old_pmd, pmd_t *new_pmd)
{
spinlock_t *old_ptl, *new_ptl;
pmd_t pmd;
-
struct mm_struct *mm = vma->vm_mm;
if ((old_addr & ~HPAGE_PMD_MASK) ||
(new_addr & ~HPAGE_PMD_MASK) ||
- old_end - old_addr < HPAGE_PMD_SIZE ||
- (new_vma->vm_flags & VM_NOHUGEPAGE))
+ old_end - old_addr < HPAGE_PMD_SIZE)
return false;
/*