From: Johannes Weiner Date: Tue, 31 Jul 2012 23:45:28 +0000 (-0700) Subject: mm: swapfile: clean up unuse_pte race handling X-Git-Tag: Ubuntu-5.2.0-15.16~17468^2~23 X-Git-Url: https://git.proxmox.com/?a=commitdiff_plain;h=5d84c7766e8aacc6e3477bdf02fdb417163cf89b;p=mirror_ubuntu-eoan-kernel.git mm: swapfile: clean up unuse_pte race handling 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 Acked-by: KAMEZAWA Hiroyuki Acked-by: Michal Hocko Cc: Hugh Dickins Cc: Johannes Weiner Cc: Michal Hocko Cc: Wanpeng Li Cc: Mel Gorman Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/mm/swapfile.c b/mm/swapfile.c index 63958d60ecb0..14e254c768fc 100644 --- a/mm/swapfile.c +++ b/mm/swapfile.c @@ -835,8 +835,7 @@ 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; }