proc_sched_show_task(): use get_nr_threads()

Trivial, use get_nr_threads() helper to read signal->count which we are
going to change.

Like other callers, proc_sched_show_task() doesn't need the exactly
precise nr_threads.

David said:

: Note that get_nr_threads() isn't completely equivalent (it can return 0
: where proc_sched_show_task() will display a 1).  But I don't think this
: should be a problem.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: David Howells <dhowells@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Acked-by: Roland McGrath <roland@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 2 insertions, 8 deletions

diff --git a/kernel/sched_debug.c b/kernel/sched_debug.c
index 87a330a7185f..35565395d00d 100644
--- a/kernel/sched_debug.c
+++ b/kernel/sched_debug.c
@@ -381,15 +381,9 @@ __initcall(init_sched_debug_procfs);
 void proc_sched_show_task(struct task_struct *p, struct seq_file *m)
 {
         unsigned long nr_switches;
-        unsigned long flags;
-        int num_threads = 1;
-
-        if (lock_task_sighand(p, &flags)) {
-                num_threads = atomic_read(&p->signal->count);
-                unlock_task_sighand(p, &flags);
-        }
 
-        SEQ_printf(m, "%s (%d, #threads: %d)\n", p->comm, p->pid, num_threads);
+        SEQ_printf(m, "%s (%d, #threads: %d)\n", p->comm, p->pid,
+                                                get_nr_threads(p));
         SEQ_printf(m,
                 "---------------------------------------------------------\n");
 #define __P(F) \