sched: Extract the basic add/sub preempt_count modifiers
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>
diff --git a/include/linux/uaccess.h b/include/linux/uaccess.h
index 5ca0951..9d8cf05 100644
--- a/include/linux/uaccess.h
+++ b/include/linux/uaccess.h
@@ -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 @@
* the pagefault handler again.
*/
barrier();
- dec_preempt_count();
- /*
- * make sure we do..
- */
- barrier();
+ preempt_count_dec();
preempt_check_resched();
}