[PATCH printk v7 32/35] panic: Mark emergency section in warn

From: John Ogness
Date: Sat Aug 03 2024 - 20:57:58 EST


From: Thomas Gleixner <tglx@xxxxxxxxxxxxx>

Mark the full contents of __warn() as an emergency section. In
this section, every printk() call will attempt to directly
flush to the consoles using the EMERGENCY priority.

Co-developed-by: John Ogness <john.ogness@xxxxxxxxxxxxx>
Signed-off-by: John Ogness <john.ogness@xxxxxxxxxxxxx>
Signed-off-by: Thomas Gleixner (Intel) <tglx@xxxxxxxxxxxxx>
Reviewed-by: Petr Mladek <pmladek@xxxxxxxx>
---
kernel/panic.c | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/kernel/panic.c b/kernel/panic.c
index 84488daa14ce..5fc44fd3b3dc 100644
--- a/kernel/panic.c
+++ b/kernel/panic.c
@@ -712,6 +712,8 @@ struct warn_args {
void __warn(const char *file, int line, void *caller, unsigned taint,
struct pt_regs *regs, struct warn_args *args)
{
+ nbcon_cpu_emergency_enter();
+
disable_trace_on_warning();

if (file)
@@ -747,6 +749,8 @@ void __warn(const char *file, int line, void *caller, unsigned taint,

/* Just a warning, don't kill lockdep. */
add_taint(taint, LOCKDEP_STILL_OK);
+
+ nbcon_cpu_emergency_exit();
}

#ifdef CONFIG_BUG
--
2.39.2