The quilt patch titled
Subject: taskstats: fill_stats_for_tgid: use for_each_thread()
has been removed from the -mm tree. Its filename was
taskstats-fill_stats_for_tgid-use-for_each_thread.patch
This patch was dropped because it was merged into the mm-nonmm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
------------------------------------------------------
From: Oleg Nesterov <oleg@xxxxxxxxxx>
Subject: taskstats: fill_stats_for_tgid: use for_each_thread()
Date: Sat, 9 Sep 2023 23:49:51 +0200
do/while_each_thread should be avoided when possible.
Plus I _think_ this change allows to avoid lock_task_sighand() but I am
not sure, I forgot everything about taskstats. In any case, this code
does not look right in that the same thread can be accounted twice:
taskstats_exit() can account the exiting thread in signal->stats and drop
->siglock but this thread is still on the thread-group list, so
lock_task_sighand() can't help.
Link: https://lkml.kernel.org/r/20230909214951.GA24274@xxxxxxxxxx
Signed-off-by: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: Eric W. Biederman <ebiederm@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/taskstats.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
--- a/kernel/taskstats.c~taskstats-fill_stats_for_tgid-use-for_each_thread
+++ a/kernel/taskstats.c
@@ -233,9 +233,8 @@ static int fill_stats_for_tgid(pid_t tgi
else
memset(stats, 0, sizeof(*stats));
- tsk = first;
start_time = ktime_get_ns();
- do {
+ for_each_thread(first, tsk) {
if (tsk->exit_state)
continue;
/*
@@ -258,7 +257,7 @@ static int fill_stats_for_tgid(pid_t tgi
stats->nvcsw += tsk->nvcsw;
stats->nivcsw += tsk->nivcsw;
- } while_each_thread(first, tsk);
+ }
unlock_task_sighand(first, &flags);
rc = 0;
_
Patches currently in -mm which might be from oleg@xxxxxxxxxx are
