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authorOleg Nesterov <oleg@tv-sign.ru>2008-04-30 07:52:38 (GMT)
committerLinus Torvalds <torvalds@linux-foundation.org>2008-04-30 15:29:34 (GMT)
commit06fffb1267c9d986687b69d74a46ee332a50575e (patch)
treebfbef85a5fa65550f40d83e75d8e23cea5238772
parentd6cf723a142f63ccb92272bc0e9bfffd3c3a5cac (diff)
downloadlinux-06fffb1267c9d986687b69d74a46ee332a50575e.tar.xz
do_task_stat: don't take rcu_read_lock()
lock_task_sighand() was changed, and do_task_stat() doesn't need rcu_read_lock any longer. sighand->siglock protects all "interesting" fields. Except: it doesn't protect ->tty->pgrp, but neither does rcu_read_lock(), this should be fixed. Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> Cc: Roland McGrath <roland@redhat.com> Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Cc: Pavel Emelyanov <xemul@sw.ru> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--fs/proc/array.c2
1 files changed, 0 insertions, 2 deletions
diff --git a/fs/proc/array.c b/fs/proc/array.c
index 07d6c48..b07a710 100644
--- a/fs/proc/array.c
+++ b/fs/proc/array.c
@@ -425,7 +425,6 @@ static int do_task_stat(struct seq_file *m, struct pid_namespace *ns,
cutime = cstime = utime = stime = cputime_zero;
cgtime = gtime = cputime_zero;
- rcu_read_lock();
if (lock_task_sighand(task, &flags)) {
struct signal_struct *sig = task->signal;
@@ -469,7 +468,6 @@ static int do_task_stat(struct seq_file *m, struct pid_namespace *ns,
unlock_task_sighand(task, &flags);
}
- rcu_read_unlock();
if (!whole || num_threads < 2)
wchan = get_wchan(task);