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From: Petr Mladek <pmladek@suse.com>
To: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>,
	Steven Rostedt <rostedt@goodmis.org>
Cc: Peter Zijlstra <peterz@infradead.org>,
	Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>,
	Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>,
	linux-kernel@vger.kernel.org, stable@vger.kernel.org,
	Petr Mladek <pmladek@suse.com>
Subject: [PATCH v2 2/3] printk: Create helper function to queue deferred console handling
Date: Wed, 27 Jun 2018 16:08:16 +0200	[thread overview]
Message-ID: <20180627140817.27764-3-pmladek@suse.com> (raw)
In-Reply-To: <20180627140817.27764-1-pmladek@suse.com>

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

Signed-off-by: Petr Mladek <pmladek@suse.com>
---
 kernel/printk/printk.c | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
index a844c611b17c..5105ad9c5eb8 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(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();
 
 	return r;
 }
-- 
2.13.7

  parent reply	other threads:[~2018-06-27 14:08 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-06-27 14:08 [PATCH v2 0/3] printk: Deadlock in NMI regression Petr Mladek
2018-06-27 14:08 ` [PATCH v2 1/3] printk: Split the code for storing a message into the log buffer Petr Mladek
2018-06-28  2:10   ` Sergey Senozhatsky
2018-06-27 14:08 ` Petr Mladek [this message]
2018-06-28  2:16   ` [PATCH v2 2/3] printk: Create helper function to queue deferred console handling Sergey Senozhatsky
2018-06-28  2:19     ` Sergey Senozhatsky
2018-06-27 14:16 ` [PATCH v2 0/3] printk: Deadlock in NMI regression Sergey Senozhatsky
2018-06-27 14:23   ` Sergey Senozhatsky
2018-06-27 14:34   ` Petr Mladek
2018-06-28  9:08     ` Sergey Senozhatsky
2018-06-27 14:20 ` [PATCH v2 3/3] printk/nmi: Prevent deadlock when accessing the main log buffer in NMI Petr Mladek
2018-06-28  2:25   ` Sergey Senozhatsky
2018-06-28  9:41     ` Petr Mladek
2018-06-29  1:47       ` Sergey Senozhatsky
2018-06-29  7:25         ` Petr Mladek
2018-06-29 10:01           ` Sergey Senozhatsky
2018-06-28  2:39 ` [PATCH v2 0/3] printk: Deadlock in NMI regression Sergey Senozhatsky
2018-06-28 10:54   ` Petr Mladek
2018-06-29  1:52     ` Sergey Senozhatsky
2018-07-09 13:27 ` Petr Mladek

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