From: Oleg Nesterov <oleg@xxxxxxxxxx> [ 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@xxxxxxxxxx Signed-off-by: Oleg Nesterov <oleg@xxxxxxxxxx> Cc: Eric W. Biederman <ebiederm@xxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> Stable-dep-of: f7ec1cd5cc7e ("getrusage: use sig->stats_lock rather than lock_task_sighand()") Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- kernel/sys.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/kernel/sys.c b/kernel/sys.c index ab621d7837c97..521a76d4adbbb 100644 --- a/kernel/sys.c +++ b/kernel/sys.c @@ -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: -- 2.43.0
