signals: rename rm_from_queue_full() to flush_sigqueue_mask()

"rm_from_queue_full" looks ugly and misleading, especially now that
rm_from_queue() has gone away.  Rename it to flush_sigqueue_mask(), this
matches flush_sigqueue() we already have.

Also remove the obsolete comment which explains the difference with
rm_from_queue() we already killed.
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Al Viro <viro@ZenIV.linux.org.uk>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Richard Weinberger <richard@nod.at>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

kernel/signal.c

@@ -706,11 +706,8 @@ void signal_wake_up_state(struct task_struct *t, unsigned int state)
  * Returns 1 if any signals were found.
  *
  * All callers must be holding the siglock.
- *
- * This version takes a sigset mask and looks at all signals,
- * not just those in the first mask word.
  */
-static int rm_from_queue_full(sigset_t *mask, struct sigpending *s)
+static int flush_sigqueue_mask(sigset_t *mask, struct sigpending *s)
 {
 	struct sigqueue *q, *n;
 	sigset_t m;
@@ -852,18 +849,18 @@ static bool prepare_signal(int sig, struct task_struct *p, bool force)
 		 * This is a stop signal.  Remove SIGCONT from all queues.
 		 */
 		siginitset(&flush, sigmask(SIGCONT));
-		rm_from_queue_full(&flush, &signal->shared_pending);
+		flush_sigqueue_mask(&flush, &signal->shared_pending);
 		for_each_thread(p, t)
-			rm_from_queue_full(&flush, &t->pending);
+			flush_sigqueue_mask(&flush, &t->pending);
 	} else if (sig == SIGCONT) {
 		unsigned int why;
 		/*
 		 * Remove all stop signals from all queues, wake all threads.
 		 */
 		siginitset(&flush, SIG_KERNEL_STOP_MASK);
-		rm_from_queue_full(&flush, &signal->shared_pending);
+		flush_sigqueue_mask(&flush, &signal->shared_pending);
 		for_each_thread(p, t) {
-			rm_from_queue_full(&flush, &t->pending);
+			flush_sigqueue_mask(&flush, &t->pending);
 			task_clear_jobctl_pending(t, JOBCTL_STOP_PENDING);
 			if (likely(!(t->ptrace & PT_SEIZED)))
 				wake_up_state(t, __TASK_STOPPED);
@@ -3102,9 +3099,9 @@ int do_sigaction(int sig, struct k_sigaction *act, struct k_sigaction *oact)
 		if (sig_handler_ignored(sig_handler(t, sig), sig)) {
 			sigemptyset(&mask);
 			sigaddset(&mask, sig);
-			rm_from_queue_full(&mask, &t->signal->shared_pending);
+			flush_sigqueue_mask(&mask, &t->signal->shared_pending);
 			do {
-				rm_from_queue_full(&mask, &t->pending);
+				flush_sigqueue_mask(&mask, &t->pending);
 			} while_each_thread(current, t);
 		}
 	}