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printk: Create helper function to queue deferred console handling

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commit a338f84dc196f44b63ba0863d2f34fd9b1613572 upstream.

It is just a preparation step. The patch does not change
the existing behavior.

Link: http://lkml.kernel.org/r/20180627140817.27764-3-pmladek@suse.com
To: Steven Rostedt <rostedt@goodmis.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>
Cc: linux-kernel@vger.kernel.org
Cc: stable@vger.kernel.org
Acked-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Signed-off-by: Petr Mladek <pmladek@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Petr Mladek 2018-06-27 16:08:16 +02:00 committed by Greg Kroah-Hartman
parent 646e7c0480
commit 943276ef14
1 changed files with 9 additions and 5 deletions
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14
kernel/printk/printk.c
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@ -2723,16 +2723,20 @@ void wake_up_klogd(void)
preempt_enable(); preempt_enable();
} }
void defer_console_output(void)
{
preempt_disable();
__this_cpu_or(printk_pending, PRINTK_PENDING_OUTPUT);
irq_work_queue(this_cpu_ptr(&wake_up_klogd_work));
preempt_enable();
}
int vprintk_deferred(const char *fmt, va_list args) int vprintk_deferred(const char *fmt, va_list args)
{ {
int r; int r;
r = vprintk_emit(0, LOGLEVEL_SCHED, NULL, 0, fmt, args); r = vprintk_emit(0, LOGLEVEL_SCHED, NULL, 0, fmt, args);
defer_console_output();
preempt_disable();
__this_cpu_or(printk_pending, PRINTK_PENDING_OUTPUT);
irq_work_queue(this_cpu_ptr(&wake_up_klogd_work));
preempt_enable();
return r; return r;
} }