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ksm: mremap use err from ksm_madvise

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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 <hugh.dickins@tiscali.co.uk>
Acked-by: Izik Eidus <ieidus@redhat.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Hugh Dickins 2009-09-21 17:02:28 -07:00 committed by Linus Torvalds
parent 35451beecb
commit 7103ad323b
1 changed files with 5 additions and 3 deletions
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8
mm/mremap.c
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@ -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);