Commit 62ec05dd authored May 24, 2017 by Thomas Gleixner

sched: Provide is_percpu_thread() helper

Provide a helper function for checking whether current task is a per cpu
thread.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Acked-by: Ingo Molnar <mingo@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Sebastian Siewior <bigeasy@linutronix.de>
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/r/20170524081549.541649540@linutronix.de

parent fc8dffd3

include/linux/sched.h

+10 −0

Original line number	Diff line number	Diff line
		@@ -1265,6 +1265,16 @@ extern struct pid *cad_pid;
		#define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
		#define used_math() tsk_used_math(current)

		static inline bool is_percpu_thread(void)
		{
		#ifdef CONFIG_SMP
		return (current->flags & PF_NO_SETAFFINITY) &&
		(current->nr_cpus_allowed == 1);
		#else
		return true;
		#endif
		}

		/* Per-process atomic flags. */
		#define PFA_NO_NEW_PRIVS 0 /* May not gain new privileges. */
		#define PFA_SPREAD_PAGE 1 /* Spread page cache over cpuset */