signals: Allow rt tasks to cache one sigqueue struct

To avoid allocation allow rt tasks to cache one sigqueue struct in
task struct.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 1 insertions, 0 deletions

diff --git a/kernel/fork.c b/kernel/fork.c
index 2bc18dd..c0174b8 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1235,6 +1235,7 @@ static struct task_struct *copy_process(unsigned long clone_flags,
 	spin_lock_init(&p->alloc_lock);
 
 	init_sigpending(&p->pending);
+	p->sigqueue_cache = NULL;
 
 	p->utime = p->stime = p->gtime = 0;
 	p->utimescaled = p->stimescaled = 0;