The patch titled
Subject: mm, oom: do not check 0 mask in out_of_memory()
has been added to the -mm mm-unstable branch. Its filename is
mm-oom-do-not-check-0-mask-in-out_of_memory.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-oom-do-not-check-0-mask-in-out_of_memory.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Haifeng Xu <haifeng.xu@xxxxxxxxxx>
Subject: mm, oom: do not check 0 mask in out_of_memory()
Date: Mon, 8 May 2023 07:35:38 +0000
Since commit 60e2793d440a ("mm, oom: do not trigger out_of_memory from the
#PF"), no user sets gfp_mask to 0. Remove the 0 mask check and update the
comments.
Link: https://lkml.kernel.org/r/20230508073538.1168-1-haifeng.xu@xxxxxxxxxx
Signed-off-by: Haifeng Xu <haifeng.xu@xxxxxxxxxx>
Acked-by: Michal Hocko <mhocko@xxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Shakeel Butt <shakeelb@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/oom_kill.c | 8 +++-----
1 file changed, 3 insertions(+), 5 deletions(-)
--- a/mm/oom_kill.c~mm-oom-do-not-check-0-mask-in-out_of_memory
+++ a/mm/oom_kill.c
@@ -1130,12 +1130,10 @@ bool out_of_memory(struct oom_control *o
/*
* The OOM killer does not compensate for IO-less reclaim.
- * pagefault_out_of_memory lost its gfp context so we have to
- * make sure exclude 0 mask - all other users should have at least
- * ___GFP_DIRECT_RECLAIM to get here. But mem_cgroup_oom() has to
- * invoke the OOM killer even if it is a GFP_NOFS allocation.
+ * But mem_cgroup_oom() has to invoke the OOM killer even
+ * if it is a GFP_NOFS allocation.
*/
- if (oc->gfp_mask && !(oc->gfp_mask & __GFP_FS) && !is_memcg_oom(oc))
+ if (!(oc->gfp_mask & __GFP_FS) && !is_memcg_oom(oc))
return true;
/*
_
Patches currently in -mm which might be from haifeng.xu@xxxxxxxxxx are
memcg-oom-remove-unnecessary-check-in-mem_cgroup_oom_synchronize.patch
memcg-oom-remove-explicit-wakeup-in-mem_cgroup_oom_synchronize.patch
mm-oom-do-not-check-0-mask-in-out_of_memory.patch
