Commit 62ec05dd authored by Thomas Gleixner's avatar 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: default avatarThomas Gleixner <tglx@linutronix.de>
Tested-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
Acked-by: default avatarIngo 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
...@@ -1265,6 +1265,16 @@ extern struct pid *cad_pid; ...@@ -1265,6 +1265,16 @@ extern struct pid *cad_pid;
#define tsk_used_math(p) ((p)->flags & PF_USED_MATH) #define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
#define used_math() tsk_used_math(current) #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. */ /* Per-process atomic flags. */
#define PFA_NO_NEW_PRIVS 0 /* May not gain new privileges. */ #define PFA_NO_NEW_PRIVS 0 /* May not gain new privileges. */
#define PFA_SPREAD_PAGE 1 /* Spread page cache over cpuset */ #define PFA_SPREAD_PAGE 1 /* Spread page cache over cpuset */
......
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