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seqlock: Change do_task_stat() to use scoped_seqlock_read()

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To simplify the code and make it more readable.

[peterz: change to new interface]
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
This commit is contained in:
Oleg Nesterov
2025-10-08 14:30:59 +02:00
committed by Peter Zijlstra
parent 488f48b326
commit b76f72bea2
1 changed files with 2 additions and 7 deletions
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9
fs/proc/array.c
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@@ -481,7 +481,6 @@ static int do_task_stat(struct seq_file *m, struct pid_namespace *ns,
unsigned long flags;
int exit_code = task->exit_code;
struct signal_struct *sig = task->signal;
unsigned int seq = 1;
state = *get_task_state(task);
vsize = eip = esp = 0;
@@ -538,10 +537,7 @@ static int do_task_stat(struct seq_file *m, struct pid_namespace *ns,
if (permitted && (!whole || num_threads < 2))
wchan = !task_is_running(task);
do {
seq++; /* 2 on the 1st/lockless path, otherwise odd */
flags = read_seqbegin_or_lock_irqsave(&sig->stats_lock, &seq);
scoped_seqlock_read (&sig->stats_lock, ss_lock_irqsave) {
cmin_flt = sig->cmin_flt;
cmaj_flt = sig->cmaj_flt;
cutime = sig->cutime;
@@ -563,8 +559,7 @@ static int do_task_stat(struct seq_file *m, struct pid_namespace *ns,
}
rcu_read_unlock();
}
} while (need_seqretry(&sig->stats_lock, seq));
done_seqretry_irqrestore(&sig->stats_lock, seq, flags);
}
if (whole) {
thread_group_cputime_adjusted(task, &utime, &stime);