On Thu 05-07-12 02:44:54, Johannes Weiner wrote:
> The conditional mem_cgroup_cancel_charge_swapin() is a leftover from
> when the function would continue to reestablish the page even after
> mem_cgroup_try_charge_swapin() failed. After 85d9fc8 "memcg: fix
> refcnt handling at swapoff", the condition is always true when this
> code is reached.
>
> Signed-off-by: Johannes Weiner <hannes@xxxxxxxxxxx>
Acked-by: Michal Hocko <mhocko@xxxxxxx>
> ---
> mm/swapfile.c | 3 +--
> 1 files changed, 1 insertions(+), 2 deletions(-)
>
> diff --git a/mm/swapfile.c b/mm/swapfile.c
> index 64408be..75881ca 100644
> --- a/mm/swapfile.c
> +++ b/mm/swapfile.c
> @@ -845,8 +845,7 @@ static int unuse_pte(struct vm_area_struct *vma, pmd_t *pmd,
>
> pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl);
> if (unlikely(!pte_same(*pte, swp_entry_to_pte(entry)))) {
> - if (ret > 0)
> - mem_cgroup_cancel_charge_swapin(memcg);
> + mem_cgroup_cancel_charge_swapin(memcg);
> ret = 0;
> goto out;
> }
> --
> 1.7.7.6
>
--
Michal Hocko
SUSE Labs
SUSE LINUX s.r.o.
Lihovarska 1060/12
190 00 Praha 9
Czech Republic
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