linux-kernel - [RFC][PATCH 4/4] printk: enable printk offloading

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Date:   Mon,  6 Mar 2017 21:45:54 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
To:     Steven Rostedt <rostedt@...dmis.org>,
        Petr Mladek <pmladek@...e.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Peter Zijlstra <peterz@...radead.org>,
        "Rafael J . Wysocki" <rjw@...ysocki.net>,
        linux-kernel@...r.kernel.org,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
Subject: [RFC][PATCH 4/4] printk: enable printk offloading

Initialize the kernel printing thread and enable printk()
offloading.

Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@...il.com>
---
 kernel/printk/printk.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
index 6e00073a7331..601a9ef6db89 100644
--- a/kernel/printk/printk.c
+++ b/kernel/printk/printk.c
@@ -2779,6 +2779,25 @@ static int printk_kthread_func(void *data)
 	return 0;
 }
 
+/*
+ * Init printk kthread at late_initcall stage, after core/arch/device/etc.
+ * initialization.
+ */
+static int __init init_printk_kthread(void)
+{
+	struct task_struct *thread;
+
+	thread = kthread_run(printk_kthread_func, NULL, "printk");
+	if (IS_ERR(thread)) {
+		pr_err("printk: unable to create printing thread\n");
+		return PTR_ERR(thread);
+	}
+
+	printk_kthread = thread;
+	return 0;
+}
+late_initcall(init_printk_kthread);
+
 void wake_up_klogd(void)
 {
 	preempt_disable();
-- 
2.12.0