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printk: robustify printk

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Avoid deadlocks against rq->lock and xtime_lock by deferring the klogd
wakeup by polling from the timer tick.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra
2008-08-08 21:47:09 +02:00
committed by Ingo Molnar
parent 796aadeb1b
commit b845b517b5
4 changed files with 23 additions and 3 deletions
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4
include/linux/kernel.h
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@@ -200,6 +200,8 @@ extern struct ratelimit_state printk_ratelimit_state;
extern int printk_ratelimit(void);
extern bool printk_timed_ratelimit(unsigned long *caller_jiffies,
unsigned int interval_msec);
extern void printk_tick(void);
extern int printk_needs_cpu(int);
#else
static inline int vprintk(const char *s, va_list args)
__attribute__ ((format (printf, 1, 0)));
@@ -211,6 +213,8 @@ static inline int printk_ratelimit(void) { return 0; }
static inline bool printk_timed_ratelimit(unsigned long *caller_jiffies, \
unsigned int interval_msec) \
{ return false; }
static inline void printk_tick(void) { }
static inline int printk_needs_cpu(int) { return 0; }
#endif
extern void asmlinkage __attribute__((format(printf, 1, 2)))