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sched: Extract the basic add/sub preempt_count modifiers

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Rewrite the preempt_count macros in order to extract the 3 basic
preempt_count value modifiers:

  __preempt_count_add()
  __preempt_count_sub()

and the new:

  __preempt_count_dec_and_test()

And since we're at it anyway, replace the unconventional
$op_preempt_count names with the more conventional preempt_count_$op.

Since these basic operators are equivalent to the previous _notrace()
variants, do away with the _notrace() versions.

Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/n/tip-ewbpdbupy9xpsjhg960zwbv8@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Peter Zijlstra 2013-09-10 12:15:23 +02:00 • committed by Ingo Molnar
parent 0102874755
commit bdb4380658
10 changed files with 113 additions and 103 deletions
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8
include/linux/uaccess.h
View file

@ -15,7 +15,7 @@
*/
static inline void pagefault_disable(void)
{
inc_preempt_count();
preempt_count_inc();
/*
* make sure to have issued the store before a pagefault
* can hit.
@ -30,11 +30,7 @@ static inline void pagefault_enable(void)
* the pagefault handler again.
*/
barrier();
dec_preempt_count();
/*
* make sure we do..
*/
barrier();
preempt_count_dec();
preempt_check_resched();
}