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[RFC][PATCH 08/11] sched: Simplify preempt_count tests

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  [RFC][PATCH 08/11] sched: Simplify preempt_count tests Peter Zijlstra <peterz@infradead.org> - 2015-09-29 11:50 +0200
    Re: [RFC][PATCH 08/11] sched: Simplify preempt_count tests Steven Rostedt <rostedt@goodmis.org> - 2015-09-29 17:50 +0200

#1234923 — [RFC][PATCH 08/11] sched: Simplify preempt_count tests

Since we stopped setting PREEMPT_ACTIVE, there is no need to mask it
out of preempt_count() tests.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
---
 include/linux/preempt.h |    3 +--
 kernel/sched/core.c     |    2 +-
 2 files changed, 2 insertions(+), 3 deletions(-)

--- a/include/linux/preempt.h
+++ b/include/linux/preempt.h
@@ -126,8 +126,7 @@
  * Check whether we were atomic before we did preempt_disable():
  * (used by the scheduler)
  */
-#define in_atomic_preempt_off() \
-		((preempt_count() & ~PREEMPT_ACTIVE) != PREEMPT_DISABLE_OFFSET)
+#define in_atomic_preempt_off() (preempt_count() != PREEMPT_DISABLE_OFFSET)
 
 #if defined(CONFIG_DEBUG_PREEMPT) || defined(CONFIG_PREEMPT_TRACER)
 extern void preempt_count_add(int val);
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -7472,7 +7472,7 @@ void __init sched_init(void)
 #ifdef CONFIG_DEBUG_ATOMIC_SLEEP
 static inline int preempt_count_equals(int preempt_offset)
 {
-	int nested = (preempt_count() & ~PREEMPT_ACTIVE) + rcu_preempt_depth();
+	int nested = preempt_count() + rcu_preempt_depth();
 
 	return (nested == preempt_offset);
 }


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#1235309

On Tue, 29 Sep 2015 11:28:33 +0200
Peter Zijlstra <peterz@infradead.org> wrote:

> Since we stopped setting PREEMPT_ACTIVE, there is no need to mask it
> out of preempt_count() tests.
> 
> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
> ---

Reviewed-by: Steven Rostedt <rostedt@goodmis.org>

-- Steve

>  include/linux/preempt.h |    3 +--
>  kernel/sched/core.c     |    2 +-
>  2 files changed, 2 insertions(+), 3 deletions(-)
> 
> --- a/include/linux/preempt.h
> +++ b/include/linux/preempt.h
> @@ -126,8 +126,7 @@
>   * Check whether we were atomic before we did preempt_disable():
>   * (used by the scheduler)
>   */
> -#define in_atomic_preempt_off() \
> -		((preempt_count() & ~PREEMPT_ACTIVE) != PREEMPT_DISABLE_OFFSET)
> +#define in_atomic_preempt_off() (preempt_count() != PREEMPT_DISABLE_OFFSET)
>  
>  #if defined(CONFIG_DEBUG_PREEMPT) || defined(CONFIG_PREEMPT_TRACER)
>  extern void preempt_count_add(int val);
> --- a/kernel/sched/core.c
> +++ b/kernel/sched/core.c
> @@ -7472,7 +7472,7 @@ void __init sched_init(void)
>  #ifdef CONFIG_DEBUG_ATOMIC_SLEEP
>  static inline int preempt_count_equals(int preempt_offset)
>  {
> -	int nested = (preempt_count() & ~PREEMPT_ACTIVE) + rcu_preempt_depth();
> +	int nested = preempt_count() + rcu_preempt_depth();
>  
>  	return (nested == preempt_offset);
>  }
> 

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