Commit a338f84d authored Jun 27, 2018 by Petr Mladek

printk: Create helper function to queue deferred console handling

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>

parent ba552399

kernel/printk/printk.c

+9 −5

Original line number	Diff line number	Diff line
		@@ -2887,16 +2887,20 @@ void wake_up_klogd(void)
		preempt_enable();
		}

		int vprintk_deferred(const char *fmt, va_list args)
		void defer_console_output(void)
		{
		int r;

		r = vprintk_emit(0, LOGLEVEL_SCHED, NULL, 0, fmt, args);

		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 r;

		r = vprintk_emit(0, LOGLEVEL_SCHED, NULL, 0, fmt, args);
		defer_console_output();

		return r;
		}