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printk: disable preemption for printk_sched

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An earlier change in -mm (printk: remove separate printk_sched
buffers...), removed the printk_sched irqsave/restore lines since it was
safe for current users.  Since we may be expanding usage of
printk_sched(), disable preepmtion for this function to make it more
generally safe to call.

Signed-off-by: John Stultz <[email protected]>
Reviewed-by: Jan Kara <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Jiri Bohac <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Steven Rostedt <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
John Stultz 2014-06-04 16:11:39 -07:00 • committed by Linus Torvalds
commit 8195460626
1 changed files with 2 additions and 0 deletions
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2
kernel/printk/printk.c
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@ -2590,12 +2590,14 @@ int printk_sched(const char *fmt, ...)
va_list args;
int r;
preempt_disable();
va_start(args, fmt);
r = vprintk_emit(0, SCHED_MESSAGE_LOGLEVEL, NULL, 0, fmt, args);
va_end(args);
__this_cpu_or(printk_pending, PRINTK_PENDING_OUTPUT);
irq_work_queue(&__get_cpu_var(wake_up_klogd_work));
preempt_enable();
return r;
}