From d2c8329a4c2e4f3d1dc59141dc9e35807de4fd8a Mon Sep 17 00:00:00 2001 From: John Ogness Date: Tue, 19 Sep 2023 17:07:34 +0000 Subject: [PATCH] panic: Mark emergency section in oops BugLink: https://bugs.launchpad.net/bugs/2060704 Mark an emergency section beginning with oops_enter() until the end of oops_exit(). In this section, the CPU will not perform console output for the printk() calls. Instead, a flushing of the console output is triggered when exiting the emergency section. 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 been triggered to flush. Signed-off-by: John Ogness Signed-off-by: Sebastian Andrzej Siewior Signed-off-by: Kevin Becker --- kernel/panic.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/kernel/panic.c b/kernel/panic.c index ee03193f9495..3754a2471b4f 100644 --- a/kernel/panic.c +++ b/kernel/panic.c @@ -634,6 +634,7 @@ 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(); @@ -656,6 +657,7 @@ void oops_exit(void) { do_oops_enter_exit(); print_oops_end_marker(); + nbcon_cpu_emergency_exit(); kmsg_dump(KMSG_DUMP_OOPS); }