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Commit e24772ad authored by Oleg Nesterov's avatar Oleg Nesterov Committed by Sasha Levin
Browse files

getrusage: use __for_each_thread() 

[ 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: default avatarOleg Nesterov <oleg@redhat.com>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Stable-dep-of: f7ec1cd5cc7e ("getrusage: use sig->stats_lock rather than lock_task_sighand()")
Signed-off-by: default avatarSasha Levin <sashal@kernel.org>
parent 33ec341e

kernel/sys.c

+1 −3
Original line number Diff line number Diff line
@@ -1760,10 +1760,8 @@ 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: