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>

1 files changed, 9 insertions, 5 deletions

diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
index a844c611b17c..1d1513215c22 100644
--- a/kernel/printk/printk.c
+++ b/kernel/printk/printk.c
@@ -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;
 }