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authorOleg Nesterov <oleg@tv-sign.ru>2007-02-10 01:44:56 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-02-11 10:51:26 -0800
commit0c12b51712ced2c0d89a8ec3d546ed810f86d33e (patch)
tree6d9baefd3148da87686ee259f51c35853377db1a /kernel/signal.c
parentb963a8441cb95999c97bea379607071a869c65f0 (diff)
downloadlinux-0c12b51712ced2c0d89a8ec3d546ed810f86d33e.tar.bz2
[PATCH] kill_pid_info: kill acquired_tasklist_lock
Kill acquired_tasklist_lock, sig_needs_tasklist() is very cheap nowadays. Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/signal.c')
-rw-r--r--kernel/signal.c9
1 files changed, 4 insertions, 5 deletions
diff --git a/kernel/signal.c b/kernel/signal.c
index 5630255d2e2a..ea4632bd40a0 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -1119,19 +1119,18 @@ kill_pg_info(int sig, struct siginfo *info, pid_t pgrp)
int kill_pid_info(int sig, struct siginfo *info, struct pid *pid)
{
int error;
- int acquired_tasklist_lock = 0;
struct task_struct *p;
rcu_read_lock();
- if (unlikely(sig_needs_tasklist(sig))) {
+ if (unlikely(sig_needs_tasklist(sig)))
read_lock(&tasklist_lock);
- acquired_tasklist_lock = 1;
- }
+
p = pid_task(pid, PIDTYPE_PID);
error = -ESRCH;
if (p)
error = group_send_sig_info(sig, info, p);
- if (unlikely(acquired_tasklist_lock))
+
+ if (unlikely(sig_needs_tasklist(sig)))
read_unlock(&tasklist_lock);
rcu_read_unlock();
return error;