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| author | Thomas Gleixner | 2017-05-24 10:15:41 +0200 |
|---|---|---|
| committer | Thomas Gleixner | 2017-05-26 10:10:47 +0200 |
| commit | 62ec05dd71b19f5be890a1992227cc7b2ac0adc4 (patch) | |
| tree | 926661715ed8f2f6affb210d68b5c00cb39e42aa /include/linux/sched.h | |
| parent | cpu/hotplug: Convert hotplug locking to percpu rwsem (diff) | |
| download | kernel-qcow2-linux-62ec05dd71b19f5be890a1992227cc7b2ac0adc4.tar.gz kernel-qcow2-linux-62ec05dd71b19f5be890a1992227cc7b2ac0adc4.tar.xz kernel-qcow2-linux-62ec05dd71b19f5be890a1992227cc7b2ac0adc4.zip | |
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
Diffstat (limited to 'include/linux/sched.h')
| -rw-r--r-- | include/linux/sched.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h index 2b69fc650201..3dfa5f99d6ee 100644 --- 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 */ |