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authorKAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>2009-01-29 14:25:13 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2009-01-29 18:04:43 -0800
commit85d9fc89fb0f0703df6444f260187c088a8d59ff (patch)
treeba034e2b8bff6b7f3b62a826a0106dc0e1391b46 /mm
parent7460db567bbca76bf087d1694d792a1a96bdaa26 (diff)
downloadlinux-85d9fc89fb0f0703df6444f260187c088a8d59ff.tar.gz
memcg: fix refcnt handling at swapoff
Now, at swapoff, even while try_charge() fails, commit is executed. This is a bug which turns the refcnt of cgroup_subsys_state negative. Reported-by: Li Zefan <lizf@cn.fujitsu.com> Tested-by: Li Zefan <lizf@cn.fujitsu.com> Tested-by: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp> Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Reviewed-by: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp> Cc: Balbir Singh <balbir@in.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/swapfile.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/mm/swapfile.c b/mm/swapfile.c
index f48b831e5e5..7e6304dfafa 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -698,8 +698,10 @@ static int unuse_pte(struct vm_area_struct *vma, pmd_t *pmd,
pte_t *pte;
int ret = 1;
- if (mem_cgroup_try_charge_swapin(vma->vm_mm, page, GFP_KERNEL, &ptr))
+ if (mem_cgroup_try_charge_swapin(vma->vm_mm, page, GFP_KERNEL, &ptr)) {
ret = -ENOMEM;
+ goto out_nolock;
+ }
pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl);
if (unlikely(!pte_same(*pte, swp_entry_to_pte(entry)))) {
@@ -723,6 +725,7 @@ static int unuse_pte(struct vm_area_struct *vma, pmd_t *pmd,
activate_page(page);
out:
pte_unmap_unlock(pte, ptl);
+out_nolock:
return ret;
}