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| author | Peter Zijlstra | 2016-09-19 12:57:53 +0200 |
|---|---|---|
| committer | Ingo Molnar | 2016-09-22 14:53:46 +0200 |
| commit | 35a773a07926a22bf19d77ee00024522279c4e68 (patch) | |
| tree | 23f24c6a2932df3cb5078e438abbfb1966e4733b /include/linux/sched.h | |
| parent | sched/core: Optimize __schedule() (diff) | |
| download | kernel-qcow2-linux-35a773a07926a22bf19d77ee00024522279c4e68.tar.gz kernel-qcow2-linux-35a773a07926a22bf19d77ee00024522279c4e68.tar.xz kernel-qcow2-linux-35a773a07926a22bf19d77ee00024522279c4e68.zip | |
sched/core: Avoid _cond_resched() for PREEMPT=y
On fully preemptible kernels _cond_resched() is pointless, so avoid
emitting any code for it.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mikulas Patocka <mpatocka@redhat.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'include/linux/sched.h')
| -rw-r--r-- | include/linux/sched.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h index f00ee8e90a29..b99fcd1b341e 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -3209,7 +3209,11 @@ static inline int signal_pending_state(long state, struct task_struct *p) * cond_resched_lock() will drop the spinlock before scheduling, * cond_resched_softirq() will enable bhs before scheduling. */ +#ifndef CONFIG_PREEMPT extern int _cond_resched(void); +#else +static inline int _cond_resched(void) { return 0; } +#endif #define cond_resched() ({ \ ___might_sleep(__FILE__, __LINE__, 0); \ |