From 85c6e8dd23c6aa9ff299bf5256fe5f0a6c44f100 Mon Sep 17 00:00:00 2001 From: Andrea Arcangeli Date: Thu, 5 Nov 2015 18:49:16 -0800 Subject: ksm: use find_mergeable_vma in try_to_merge_with_ksm_page Doing the VM_MERGEABLE check after the page == kpage check won't provide any meaningful benefit. The !vma->anon_vma check of find_mergeable_vma is the only superfluous bit in using find_mergeable_vma because the !PageAnon check of try_to_merge_one_page() implicitly checks for that, but it still looks cleaner to share the same find_mergeable_vma(). Signed-off-by: Andrea Arcangeli Acked-by: Hugh Dickins Cc: Petr Holasek Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/ksm.c | 8 ++------ 1 file changed, 2 insertions(+), 6 deletions(-) (limited to 'mm/ksm.c') diff --git a/mm/ksm.c b/mm/ksm.c index d4ee1591520b..01830839d6e1 100644 --- a/mm/ksm.c +++ b/mm/ksm.c @@ -1021,8 +1021,6 @@ static int try_to_merge_one_page(struct vm_area_struct *vma, if (page == kpage) /* ksm page forked */ return 0; - if (!(vma->vm_flags & VM_MERGEABLE)) - goto out; if (PageTransCompound(page) && page_trans_compound_anon_split(page)) goto out; BUG_ON(PageTransCompound(page)); @@ -1087,10 +1085,8 @@ static int try_to_merge_with_ksm_page(struct rmap_item *rmap_item, int err = -EFAULT; down_read(&mm->mmap_sem); - if (ksm_test_exit(mm)) - goto out; - vma = find_vma(mm, rmap_item->address); - if (!vma || vma->vm_start > rmap_item->address) + vma = find_mergeable_vma(mm, rmap_item->address); + if (!vma) goto out; err = try_to_merge_one_page(vma, page, kpage); -- cgit v1.2.3-58-ga151