[PATCH RESEND2 08/11] signals: kill the obsolete sigdelset() and recalc_sigpending() in allow_signal()

[Oleg Nesterov]

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 <o...@redhat.com>
---
 kernel/signal.c |    5 +----
 1 files changed, 1 insertions(+), 4 deletions(-)

diff --git a/kernel/signal.c b/kernel/signal.c
index 8a7ee44..3eec27b 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -3071,16 +3071,13 @@ 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

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