From: Oleg Nesterov oleg@redhat.com
[ 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 --- kernel/sys.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-)
diff --git a/kernel/sys.c b/kernel/sys.c index 25f0c0697356b..85f358a5d5eb5 100644 --- a/kernel/sys.c +++ b/kernel/sys.c @@ -1807,10 +1807,8 @@ 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;
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