From: Hugh Dickins Date: Tue, 22 Sep 2009 00:02:28 +0000 (-0700) Subject: ksm: mremap use err from ksm_madvise X-Git-Tag: v2.6.32-rc1~537 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=7103ad323b1ae32bedc3267402117e2f8b45e48d;p=platform%2Fkernel%2Flinux-3.10.git ksm: mremap use err from ksm_madvise mremap move's use of ksm_madvise() was assuming -ENOMEM on failure, because ksm_madvise used to say -EAGAIN for that; but ksm_madvise now says -ENOMEM (letting madvise convert that to -EAGAIN), and can also say -ERESTARTSYS when signalled: so pass the error from ksm_madvise. Signed-off-by: Hugh Dickins Acked-by: Izik Eidus Cc: Andrea Arcangeli Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/mm/mremap.c b/mm/mremap.c index 93addde..20a07db 100644 --- a/mm/mremap.c +++ b/mm/mremap.c @@ -175,6 +175,7 @@ static unsigned long move_vma(struct vm_area_struct *vma, unsigned long excess = 0; unsigned long hiwater_vm; int split = 0; + int err; /* * We'd prefer to avoid failure later on in do_munmap: @@ -190,9 +191,10 @@ static unsigned long move_vma(struct vm_area_struct *vma, * pages recently unmapped. But leave vma->vm_flags as it was, * so KSM can come around to merge on vma and new_vma afterwards. */ - if (ksm_madvise(vma, old_addr, old_addr + old_len, - MADV_UNMERGEABLE, &vm_flags)) - return -ENOMEM; + err = ksm_madvise(vma, old_addr, old_addr + old_len, + MADV_UNMERGEABLE, &vm_flags); + if (err) + return err; new_pgoff = vma->vm_pgoff + ((old_addr - vma->vm_start) >> PAGE_SHIFT); new_vma = copy_vma(&vma, new_addr, new_len, new_pgoff);