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Subject[PATCH RESEND2 03/11] 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 <oleg@redhat.com>
---
kernel/signal.c | 43 ++++++++++---------------------------------
1 files changed, 10 insertions(+), 33 deletions(-)

diff --git a/kernel/signal.c b/kernel/signal.c
index a717749..6072efa 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -727,29 +727,6 @@ 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)
{
@@ -861,6 +838,7 @@ 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)
@@ -872,26 +850,25 @@ 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.
--
1.5.5.1


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