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author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2012-02-27 10:47:00 +0100 |
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committer | Ingo Molnar <mingo@elte.hu> | 2012-03-12 20:43:16 +0100 |
commit | 3ccf3e8306156a28213adc720aba807e9a901ad5 (patch) | |
tree | 5b9db344b702299ea7eb53fbff3d0d74707d40ec /include/linux/printk.h | |
parent | 554cecaf733623b327eef9652b65965eb1081b81 (diff) | |
download | linux-stable-3ccf3e8306156a28213adc720aba807e9a901ad5.tar.gz linux-stable-3ccf3e8306156a28213adc720aba807e9a901ad5.tar.bz2 linux-stable-3ccf3e8306156a28213adc720aba807e9a901ad5.zip |
printk/sched: Introduce special printk_sched() for those awkward moments
There's a few awkward printk()s inside of scheduler guts that people
prefer to keep but really are rather deadlock prone. Fudge around it
by storing the text in a per-cpu buffer and poll it using the existing
printk_tick() handler.
This will drop output when its more frequent than once a tick, however
only the affinity thing could possible go that fast and for that just
one should suffice to notify the admin he's done something silly..
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Link: http://lkml.kernel.org/n/tip-wua3lmkt3dg8nfts66o6brne@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include/linux/printk.h')
-rw-r--r-- | include/linux/printk.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/include/linux/printk.h b/include/linux/printk.h index f0e22f75143f..1f77a4174ee0 100644 --- a/include/linux/printk.h +++ b/include/linux/printk.h @@ -101,6 +101,11 @@ asmlinkage __printf(1, 2) __cold int printk(const char *fmt, ...); /* + * Special printk facility for scheduler use only, _DO_NOT_USE_ ! + */ +__printf(1, 2) __cold int printk_sched(const char *fmt, ...); + +/* * Please don't use printk_ratelimit(), because it shares ratelimiting state * with all other unrelated printk_ratelimit() callsites. Instead use * printk_ratelimited() or plain old __ratelimit(). @@ -127,6 +132,11 @@ int printk(const char *s, ...) { return 0; } +static inline __printf(1, 2) __cold +int printk_sched(const char *s, ...) +{ + return 0; +} static inline int printk_ratelimit(void) { return 0; |