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mm, oom: do not check 0 mask in out_of_memory()

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Since commit 60e2793d44 ("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@shopee.com
Signed-off-by: Haifeng Xu <haifeng.xu@shopee.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Shakeel Butt <shakeelb@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Haifeng Xu 2023-05-08 07:35:38 +00:00 committed by Andrew Morton
parent 97de10a993
commit 4822acb136
1 changed files with 3 additions and 5 deletions
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8
mm/oom_kill.c
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@ -1130,12 +1130,10 @@ bool out_of_memory(struct oom_control *oc)
/*
* 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;
/*