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printk: Track nbcon consoles

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BugLink: https://bugs.launchpad.net/bugs/2060704

Add a global flag @have_nbcon_console to identify if any nbcon
consoles are registered. This will be used in follow-up commits
to preserve legacy behavior when no nbcon consoles are registered.

Signed-off-by: John Ogness <john.ogness@linutronix.de>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Kevin Becker <kevin.becker@canonical.com>
This commit is contained in:
John Ogness
2023-12-11 09:36:52 +00:00
committed by Kevin Becker
parent f402f978e9
commit 39d010a426
1 changed files with 13 additions and 1 deletions
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kernel/printk/printk.c
+13 -1
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@@ -470,6 +470,11 @@ static DEFINE_MUTEX(syslog_lock);
*/
static bool have_legacy_console;
/*
* Specifies if an nbcon console is registered.
*/
static bool have_nbcon_console;
/*
* Specifies if a boot console is registered. If boot consoles are present,
* nbcon consoles cannot print simultaneously and must be synchronized by
@@ -3559,6 +3564,7 @@ void register_console(struct console *newcon)
console_init_seq(newcon, bootcon_registered);
if (newcon->flags & CON_NBCON) {
have_nbcon_console = true;
nbcon_init(newcon);
/*
@@ -3645,6 +3651,7 @@ EXPORT_SYMBOL(register_console);
static int unregister_console_locked(struct console *console)
{
bool found_legacy_con = false;
bool found_nbcon_con = false;
bool found_boot_con = false;
struct console *c;
int res;
@@ -3701,13 +3708,18 @@ static int unregister_console_locked(struct console *console)
for_each_console(c) {
if (c->flags & CON_BOOT)
found_boot_con = true;
if (!(c->flags & CON_NBCON))
if (c->flags & CON_NBCON)
found_nbcon_con = true;
else
found_legacy_con = true;
}
if (!found_boot_con)
have_boot_console = found_boot_con;
if (!found_legacy_con)
have_legacy_console = found_legacy_con;
if (!found_nbcon_con)
have_nbcon_console = found_nbcon_con;
return res;
}