xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

sched/rt: Document scheduler related skip-resched-check sites

Browse Source 
Create a distinction between scheduler related preempt_enable_no_resched()
calls and the nearly one hundred other places in the kernel that do not
want to reschedule, for one reason or another.

This distinction matters for -rt, where the scheduler and the non-scheduler
preempt models (and checks) are different. For upstream it's purely
documentational.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/n/tip-gs88fvx2mdv5psnzxnv575ke@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Thomas Gleixner
2011-03-21 13:32:17 +01:00
committed by Ingo Molnar
parent bd2f55361f
commit ba74c1448f
5 changed files with 11 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files

5
include/linux/preempt.h
View File

@@ -48,12 +48,14 @@ do { \
barrier(); \
} while (0)
#define preempt_enable_no_resched() \
#define sched_preempt_enable_no_resched() \
do { \
barrier(); \
dec_preempt_count(); \
} while (0)
#define preempt_enable_no_resched() sched_preempt_enable_no_resched()
#define preempt_enable() \
do { \
preempt_enable_no_resched(); \
@@ -92,6 +94,7 @@ do { \
#else /* !CONFIG_PREEMPT_COUNT */
#define preempt_disable() do { } while (0)
#define sched_preempt_enable_no_resched() do { } while (0)
#define preempt_enable_no_resched() do { } while (0)
#define preempt_enable() do { } while (0)