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getrusage: use __for_each_thread()

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[ Upstream commit 13b7bc60b5353371460a203df6c38ccd38ad7a3a ]

do/while_each_thread should be avoided when possible.

Plus this change allows to avoid lock_task_sighand(), we can use rcu
and/or sig->stats_lock instead.

Link: https://lkml.kernel.org/r/20230909172629.GA20454@redhat.com
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Stable-dep-of: f7ec1cd5cc7e ("getrusage: use sig->stats_lock rather than lock_task_sighand()")
Signed-off-by: Sasha Levin <sashal@kernel.org>
(cherry picked from commit e24772adaaf4b81ac0855cceb17080352526f765)
Signed-off-by: Vegard Nossum <vegard.nossum@oracle.com>
This commit is contained in:
Oleg Nesterov 2023-09-09 19:26:29 +02:00 committed by Vegard Nossum
parent c048d8254a
commit 82f1e0dc48
1 changed files with 1 additions and 3 deletions
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4
kernel/sys.c
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@ -1702,10 +1702,8 @@ void getrusage(struct task_struct *p, int who, struct rusage *r)
r->ru_oublock += sig->oublock;
if (maxrss < sig->maxrss)
maxrss = sig->maxrss;
t = p;
do {
__for_each_thread(sig, t)
accumulate_thread_rusage(t, r);
} while_each_thread(p, t);
break;
default: