From: Thomas Gleixner Date: Fri, 24 Jul 2009 12:38:56 +0200 Subject: preempt: Provide preempt_*_(no)rt variants Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/5.9/older/patches-5.9.1-rt20.tar.xz RT needs a few preempt_disable/enable points which are not necessary otherwise. Implement variants to avoid #ifdeffery. Signed-off-by: Thomas Gleixner --- include/linux/preempt.h | 18 +++++++++++++++++- 1 file changed, 17 insertions(+), 1 deletion(-) --- a/include/linux/preempt.h +++ b/include/linux/preempt.h @@ -185,7 +185,11 @@ do { \ preempt_count_dec(); \ } while (0) -#define preempt_enable_no_resched() sched_preempt_enable_no_resched() +#ifdef CONFIG_PREEMPT_RT +# define preempt_enable_no_resched() sched_preempt_enable_no_resched() +#else +# define preempt_enable_no_resched() preempt_enable() +#endif #define preemptible() (preempt_count() == 0 && !irqs_disabled()) @@ -279,6 +283,18 @@ do { \ set_preempt_need_resched(); \ } while (0) +#ifdef CONFIG_PREEMPT_RT +# define preempt_disable_rt() preempt_disable() +# define preempt_enable_rt() preempt_enable() +# define preempt_disable_nort() barrier() +# define preempt_enable_nort() barrier() +#else +# define preempt_disable_rt() barrier() +# define preempt_enable_rt() barrier() +# define preempt_disable_nort() preempt_disable() +# define preempt_enable_nort() preempt_enable() +#endif + #ifdef CONFIG_PREEMPT_NOTIFIERS struct preempt_notifier;