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printk: move @seq initialization to helper

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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@linutronix.de>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Signed-off-by: Petr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/20221116162152.193147-6-john.ogness@linutronix.de
This commit is contained in:
John Ogness 2022-11-16 17:27:17 +01:06 committed by Petr Mladek
parent 1145703612
commit b80ea0e81b
1 changed files with 14 additions and 9 deletions
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23
kernel/printk/printk.c
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@ -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