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printk: Coordinate direct printing in panic

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If legacy and nbcon consoles are registered and the nbcon
consoles are allowed to flush (i.e. no boot consoles
registered), the legacy consoles will no longer perform
direct printing on the panic CPU until after the backtrace
has been stored. This will give the safe nbcon consoles a
chance to print the panic messages before allowing the
unsafe legacy consoles to print.

If no nbcon consoles are registered or they are not allowed
to flush because boot consoles are registered, there is no
change in behavior (i.e. legacy consoles will always attempt
to print from the printk() caller context).

Signed-off-by: John Ogness <john.ogness@linutronix.de>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/20240820063001.36405-30-john.ogness@linutronix.de
Signed-off-by: Petr Mladek <pmladek@suse.com>
This commit is contained in:
John Ogness
2024-08-20 08:35:55 +02:06
committed by Petr Mladek
parent bebd87ae27
commit e35a888427
4 changed files with 56 additions and 7 deletions
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2
kernel/panic.c
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@@ -374,6 +374,8 @@ void panic(const char *fmt, ...)
panic_other_cpus_shutdown(_crash_kexec_post_notifiers);
printk_legacy_allow_panic_sync();
/*
* Run any panic handlers, including those that might need to
* add information to the kmsg dump output.