diff options
| author | KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> | 2009-01-29 14:25:13 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-01-29 18:04:43 -0800 |
| commit | 85d9fc89fb0f0703df6444f260187c088a8d59ff (patch) | |
| tree | ba034e2b8bff6b7f3b62a826a0106dc0e1391b46 | |
| parent | 7460db567bbca76bf087d1694d792a1a96bdaa26 (diff) | |
| download | lwn-85d9fc89fb0f0703df6444f260187c088a8d59ff.tar.gz lwn-85d9fc89fb0f0703df6444f260187c088a8d59ff.zip | |
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>
| -rw-r--r-- | mm/swapfile.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/mm/swapfile.c b/mm/swapfile.c index f48b831e5e5c..7e6304dfafab 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; } |