linux-kernel - [PATCH printk v5 05/40] printk: move @seq initialization to helper

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Message-Id: <20221116162152.193147-6-john.ogness@linutronix.de>
Date:   Wed, 16 Nov 2022 17:27:17 +0106
From:   John Ogness <john.ogness@...utronix.de>
To:     Petr Mladek <pmladek@...e.com>
Cc:     Sergey Senozhatsky <senozhatsky@...omium.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-kernel@...r.kernel.org
Subject: [PATCH printk v5 05/40] printk: move @seq initialization to helper

The code to initialize @seq for a new console needs to consider
more factors when choosing an initial value. Move the code into
a helper function console_init_seq() "as is" so this code can
be expanded without causing register_console() to become too
long. A later commit will implement the additional code.

Signed-off-by: John Ogness <john.ogness@...utronix.de>
---
 kernel/printk/printk.c | 23 ++++++++++++++---------
 1 file changed, 14 insertions(+), 9 deletions(-)

diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
index 3d449dfb1ed6..31d9d1cf8682 100644
--- a/kernel/printk/printk.c
+++ b/kernel/printk/printk.c
@@ -3131,6 +3131,19 @@ static void try_enable_default_console(struct console *newcon)
 	       (con->flags & CON_BOOT) ? "boot" : "",	\
 	       con->name, con->index, ##__VA_ARGS__)
 
+static void console_init_seq(struct console *newcon)
+{
+	if (newcon->flags & CON_PRINTBUFFER) {
+		/* Get a consistent copy of @syslog_seq. */
+		mutex_lock(&syslog_lock);
+		newcon->seq = syslog_seq;
+		mutex_unlock(&syslog_lock);
+	} else {
+		/* Begin with next message. */
+		newcon->seq = prb_next_seq(prb);
+	}
+}
+
 #define console_first()				\
 	hlist_entry(console_list.first, struct console, node)
 
@@ -3222,15 +3235,7 @@ void register_console(struct console *newcon)
 	}
 
 	newcon->dropped = 0;
-	if (newcon->flags & CON_PRINTBUFFER) {
-		/* Get a consistent copy of @syslog_seq. */
-		mutex_lock(&syslog_lock);
-		newcon->seq = syslog_seq;
-		mutex_unlock(&syslog_lock);
-	} else {
-		/* Begin with next message. */
-		newcon->seq = prb_next_seq(prb);
-	}
+	console_init_seq(newcon);
 
 	/*
 	 * Put this console in the list - keep the
-- 
2.30.2