Provide a helper function for checking whether current task is a per cpu
thread.
Signed-off-by: Thomas Gleixner <t...@linutronix.de>
---
include/linux/sched.h | 10 ++++++++++
1 file changed, 10 insertions(+)
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -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 */
