[PATCH 08/11] signals: kill the obsolete sigdelset() and recalc_sigpending() in allow_signal()

[Oleg Nesterov <oleg@redhat.com>]

allow_signal() does sigdelset(current->blocked) due to historic
reason, previously it could be called by a daemonize()'ed kthread,
and daemonize() played with current->blocked.

Now that daemonize() has gone away we can remove sigdelset() and
recalc_sigpending(). If a user really wants to unblock a signal,
it must use sigprocmask() or set_current_block() explicitely.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
---
 kernel/signal.c |    5 +----
 1 files changed, 1 insertions(+), 4 deletions(-)

diff --git a/kernel/signal.c b/kernel/signal.c
index a2b8c1b..30bfe53 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -3069,16 +3069,13 @@ COMPAT_SYSCALL_DEFINE4(rt_tgsigqueueinfo,
  */
 void allow_signal(int sig)
 {
-	spin_lock_irq(&current->sighand->siglock);
-	/* This is only needed for daemonize()'ed kthreads */
-	sigdelset(&current->blocked, sig);
 	/*
 	 * Kernel threads handle their own signals. Let the signal code
 	 * know it'll be handled, so that they don't get converted to
 	 * SIGKILL or just silently dropped.
 	 */
+	spin_lock_irq(&current->sighand->siglock);
 	current->sighand->action[(sig)-1].sa.sa_handler = (void __user *)2;
-	recalc_sigpending();
 	spin_unlock_irq(&current->sighand->siglock);
 }
 EXPORT_SYMBOL(allow_signal);
-- 
1.5.5.1