Commit 690cc3ff authored May 13, 2009 by Eric W. Biederman Committed by David S. Miller May 18, 2009

syscall: Implement a convinience function restart_syscall

Currently when we have a signal pending we have the functionality
to restart that the current system call. There are other cases
such as nasty lock ordering issues where it makes sense to have
a simple fix that uses try lock and restarts the system call.
Buying time to figure out how to rework the locking strategy.

Signed-off-by: Eric W. Biederman <ebiederm@aristanetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent 69e3c75f

include/linux/sched.h

+6 −0

Original line number	Diff line number	Diff line
		@@ -2178,6 +2178,12 @@ static inline int test_tsk_need_resched(struct task_struct *tsk)
		return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED));
		}

		static inline int restart_syscall(void)
		{
		set_tsk_thread_flag(current, TIF_SIGPENDING);
		return -ERESTARTNOINTR;
		}

		static inline int signal_pending(struct task_struct *p)
		{
		return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING));