From 9490592f2762320ac220f50d4459d9ea7bb797c8 Mon Sep 17 00:00:00 2001 From: Oleg Nesterov Date: Fri, 6 Jun 2014 14:36:48 -0700 Subject: [PATCH] signals: kill rm_from_queue(), change prepare_signal() to use for_each_thread() rm_from_queue() doesn't make sense. The only caller, prepare_signal(), can use rm_from_queue_full() with the same effect. While at it, change prepare_signal() to use for_each_thread() instead of do/while_each_thread. Signed-off-by: Oleg Nesterov Cc: Peter Zijlstra Cc: Al Viro Cc: David Woodhouse Cc: Frederic Weisbecker Cc: Geert Uytterhoeven Cc: Ingo Molnar Cc: Mathieu Desnoyers Cc: Richard Weinberger Cc: Steven Rostedt Cc: Tejun Heo Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- kernel/signal.c | 43 ++++++++++--------------------------------- 1 file changed, 10 insertions(+), 33 deletions(-) diff --git a/kernel/signal.c b/kernel/signal.c index 251ca9c9d666..19316dc3eb0b 100644 --- a/kernel/signal.c +++ b/kernel/signal.c @@ -728,29 +728,6 @@ static int rm_from_queue_full(sigset_t *mask, struct sigpending *s) } return 1; } -/* - * Remove signals in mask from the pending set and queue. - * Returns 1 if any signals were found. - * - * All callers must be holding the siglock. - */ -static int rm_from_queue(unsigned long mask, struct sigpending *s) -{ - struct sigqueue *q, *n; - - if (!sigtestsetmask(&s->signal, mask)) - return 0; - - sigdelsetmask(&s->signal, mask); - list_for_each_entry_safe(q, n, &s->list, list) { - if (q->info.si_signo < SIGRTMIN && - (mask & sigmask(q->info.si_signo))) { - list_del_init(&q->list); - __sigqueue_free(q); - } - } - return 1; -} static inline int is_si_special(const struct siginfo *info) { @@ -862,6 +839,7 @@ static bool prepare_signal(int sig, struct task_struct *p, bool force) { struct signal_struct *signal = p->signal; struct task_struct *t; + sigset_t flush; if (signal->flags & (SIGNAL_GROUP_EXIT | SIGNAL_GROUP_COREDUMP)) { if (signal->flags & SIGNAL_GROUP_COREDUMP) @@ -873,26 +851,25 @@ static bool prepare_signal(int sig, struct task_struct *p, bool force) /* * This is a stop signal. Remove SIGCONT from all queues. */ - rm_from_queue(sigmask(SIGCONT), &signal->shared_pending); - t = p; - do { - rm_from_queue(sigmask(SIGCONT), &t->pending); - } while_each_thread(p, t); + siginitset(&flush, sigmask(SIGCONT)); + rm_from_queue_full(&flush, &signal->shared_pending); + for_each_thread(p, t) + rm_from_queue_full(&flush, &t->pending); } else if (sig == SIGCONT) { unsigned int why; /* * Remove all stop signals from all queues, wake all threads. */ - rm_from_queue(SIG_KERNEL_STOP_MASK, &signal->shared_pending); - t = p; - do { + siginitset(&flush, SIG_KERNEL_STOP_MASK); + rm_from_queue_full(&flush, &signal->shared_pending); + for_each_thread(p, t) { + rm_from_queue_full(&flush, &t->pending); task_clear_jobctl_pending(t, JOBCTL_STOP_PENDING); - rm_from_queue(SIG_KERNEL_STOP_MASK, &t->pending); if (likely(!(t->ptrace & PT_SEIZED))) wake_up_state(t, __TASK_STOPPED); else ptrace_trap_notify(t); - } while_each_thread(p, t); + } /* * Notify the parent with CLD_CONTINUED if we were stopped. -- 2.20.1