diff options
author | Thomas Gleixner <tglx@linutronix.de> | 2011-03-21 08:32:17 -0400 |
---|---|---|
committer | Ingo Molnar <mingo@elte.hu> | 2012-03-01 04:28:04 -0500 |
commit | ba74c1448f127649046615ec017bded7b2a76f29 (patch) | |
tree | 33eceaf0c4b35aca095e3e1a678bdbab23006650 /include/linux/preempt.h | |
parent | bd2f55361f18347e890d52ff9cfd8895455ec11b (diff) |
sched/rt: Document scheduler related skip-resched-check sites
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>
Diffstat (limited to 'include/linux/preempt.h')
-rw-r--r-- | include/linux/preempt.h | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/include/linux/preempt.h b/include/linux/preempt.h index 58969b2a8a82..5a710b9c578e 100644 --- a/include/linux/preempt.h +++ b/include/linux/preempt.h | |||
@@ -48,12 +48,14 @@ do { \ | |||
48 | barrier(); \ | 48 | barrier(); \ |
49 | } while (0) | 49 | } while (0) |
50 | 50 | ||
51 | #define preempt_enable_no_resched() \ | 51 | #define sched_preempt_enable_no_resched() \ |
52 | do { \ | 52 | do { \ |
53 | barrier(); \ | 53 | barrier(); \ |
54 | dec_preempt_count(); \ | 54 | dec_preempt_count(); \ |
55 | } while (0) | 55 | } while (0) |
56 | 56 | ||
57 | #define preempt_enable_no_resched() sched_preempt_enable_no_resched() | ||
58 | |||
57 | #define preempt_enable() \ | 59 | #define preempt_enable() \ |
58 | do { \ | 60 | do { \ |
59 | preempt_enable_no_resched(); \ | 61 | preempt_enable_no_resched(); \ |
@@ -92,6 +94,7 @@ do { \ | |||
92 | #else /* !CONFIG_PREEMPT_COUNT */ | 94 | #else /* !CONFIG_PREEMPT_COUNT */ |
93 | 95 | ||
94 | #define preempt_disable() do { } while (0) | 96 | #define preempt_disable() do { } while (0) |
97 | #define sched_preempt_enable_no_resched() do { } while (0) | ||
95 | #define preempt_enable_no_resched() do { } while (0) | 98 | #define preempt_enable_no_resched() do { } while (0) |
96 | #define preempt_enable() do { } while (0) | 99 | #define preempt_enable() do { } while (0) |
97 | 100 | ||