unimore/kernel-hacking-2024-linux-steffo
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panic: Mark emergency section in oops

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Mark an emergency section beginning with oops_enter() until the
end of oops_exit(). In this section, every printk() call will
attempt to directly flush to the consoles using the EMERGENCY
priority.

The very end of oops_exit() performs a kmsg_dump(). This is not
included in the emergency section because it is another
flushing mechanism that should occur after the consoles have
flushed the oops messages.

Signed-off-by: John Ogness <john.ogness@linutronix.de>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/20240820063001.36405-34-john.ogness@linutronix.de
Signed-off-by: Petr Mladek <pmladek@suse.com>
This commit is contained in:
John Ogness 2024-08-20 08:35:59 +02:06 committed by Petr Mladek
parent 4833794db6
commit 4bdfa0d8e9
1 changed files with 2 additions and 0 deletions
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2
kernel/panic.c
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@ -685,6 +685,7 @@ bool oops_may_print(void)
*/
void oops_enter(void)
{
nbcon_cpu_emergency_enter();
tracing_off();
/* can't trust the integrity of the kernel anymore: */
debug_locks_off();
@ -707,6 +708,7 @@ void oops_exit(void)
{
do_oops_enter_exit();
print_oops_end_marker();
nbcon_cpu_emergency_exit();
kmsg_dump(KMSG_DUMP_OOPS);
}