From: Oleg Nesterov <oleg@redhat.com>
To: Andrew Morton <akpm@linux-foundation.org>,
Peter Zijlstra <peterz@infradead.org>
Cc: Al Viro <viro@ZenIV.linux.org.uk>,
David Woodhouse <dwmw2@infradead.org>,
Frederic Weisbecker <fweisbec@gmail.com>,
Geert Uytterhoeven <geert@linux-m68k.org>,
Ingo Molnar <mingo@kernel.org>,
Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
Richard Weinberger <richard@nod.at>,
Steven Rostedt <rostedt@goodmis.org>, Tejun Heo <tj@kernel.org>,
linux-kernel@vger.kernel.org
Subject: [PATCH RESEND2 08/11] signals: kill the obsolete sigdelset() and recalc_sigpending() in allow_signal()
Date: Tue, 15 Apr 2014 20:37:06 +0200 [thread overview]
Message-ID: <20140415183706.GA13426@redhat.com> (raw)
In-Reply-To: <20140415183625.GA13371@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 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(¤t->sighand->siglock);
- /* This is only needed for daemonize()'ed kthreads */
- sigdelset(¤t->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(¤t->sighand->siglock);
current->sighand->action[(sig)-1].sa.sa_handler = (void __user *)2;
- recalc_sigpending();
spin_unlock_irq(¤t->sighand->siglock);
}
EXPORT_SYMBOL(allow_signal);
--
1.5.5.1
next prev parent reply other threads:[~2014-04-15 18:38 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-04-15 18:36 [PATCH RESEND2 00/11] cleanup/fix allow_signal/disallow_signal Oleg Nesterov
2014-04-15 18:36 ` [PATCH RESEND2 01/11] signals: kill sigfindinword() Oleg Nesterov
2014-04-15 18:36 ` [PATCH RESEND2 02/11] signals: s/siginitset/sigemptyset/ in do_sigtimedwait() Oleg Nesterov
2014-04-15 18:36 ` [PATCH RESEND2 03/11] signals: kill rm_from_queue(), change prepare_signal() to use for_each_thread() Oleg Nesterov
2014-04-15 18:36 ` [PATCH RESEND2 04/11] signals: rename rm_from_queue_full() to flush_sigqueue_mask() Oleg Nesterov
2014-04-15 18:36 ` [PATCH RESEND2 05/11] signals: cleanup the usage of t/current in do_sigaction() Oleg Nesterov
2014-04-15 18:36 ` [PATCH RESEND2 06/11] signals: mv {dis,}allow_signal() from sched.h/exit.c to signal.[ch] Oleg Nesterov
2014-04-15 18:36 ` [PATCH RESEND2 07/11] signals: jffs2: fix the wrong usage of disallow_signal() Oleg Nesterov
2014-04-15 18:37 ` Oleg Nesterov [this message]
2014-04-15 18:37 ` [PATCH RESEND2 09/11] signals: disallow_signal() should flush the potentially pending signal Oleg Nesterov
2014-04-15 18:37 ` [PATCH RESEND2 10/11] signals: introduce kernel_sigaction() Oleg Nesterov
2014-04-15 18:37 ` [PATCH RESEND2 11/11] signals: change wait_for_helper() to use kernel_sigaction() Oleg Nesterov
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