提交 81954606 编写于 作者: J John Stultz 提交者: Linus Torvalds

printk: disable preemption for printk_sched

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: NJohn Stultz <john.stultz@linaro.org>
Reviewed-by: NJan Kara <jack@suse.cz>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Jiri Bohac <jbohac@suse.cz>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
上级 458df9fd
......@@ -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;
}
......
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