diff options
| author | John Ogness <john.ogness@linutronix.de> | 2024-08-20 08:35:54 +0206 |
|---|---|---|
| committer | Petr Mladek <pmladek@suse.com> | 2024-08-21 14:56:25 +0200 |
| commit | bebd87ae27e052e390c203893c7ee46f54b0bf9e (patch) | |
| tree | 0de6c951d527242c15e5dd9538a66835a381dcee | |
| parent | 60013065fdc677df7b71f9a0bac501020e3bbd4f (diff) | |
printk: Track nbcon consoles
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>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/20240820063001.36405-29-john.ogness@linutronix.de
Signed-off-by: Petr Mladek <pmladek@suse.com>
| -rw-r--r-- | kernel/printk/printk.c | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c index b3ddcf39a53c..e30107d216a5 100644 --- a/kernel/printk/printk.c +++ b/kernel/printk/printk.c @@ -471,6 +471,11 @@ 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 * the console lock. This is because boot consoles and nbcon consoles may @@ -3638,6 +3643,7 @@ void register_console(struct console *newcon) init_seq = get_init_console_seq(newcon, bootcon_registered); if (newcon->flags & CON_NBCON) { + have_nbcon_console = true; nbcon_seq_force(newcon, init_seq); } else { have_legacy_console = true; @@ -3718,6 +3724,7 @@ static int unregister_console_locked(struct console *console) { bool use_device_lock = (console->flags & CON_NBCON) && console->write_atomic; bool found_legacy_con = false; + bool found_nbcon_con = false; bool found_boot_con = false; unsigned long flags; struct console *c; @@ -3785,13 +3792,18 @@ 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; } |