From: John Ogness <john.ogness@linutronix.de>
Date: Fri, 13 Oct 2023 20:13:02 +0000
Subject: [PATCH 090/134] printk: For @suppress_panic_printk check for other
 CPU in panic
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/6.6/older/patches-6.6.7-rt18.tar.xz

Currently @suppress_panic_printk is checked along with
non-matching @panic_cpu and current CPU. This works
because @suppress_panic_printk is only set when
panic_in_progress() is true.

Rather than relying on the @suppress_panic_printk semantics,
use the concise helper function other_cpu_in_progress(). The
helper function exists to avoid open coding such tests.

Signed-off-by: John Ogness <john.ogness@linutronix.de>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
 kernel/printk/printk.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/kernel/printk/printk.c
+++ b/kernel/printk/printk.c
@@ -2271,8 +2271,7 @@ asmlinkage int vprintk_emit(int facility
 	if (unlikely(suppress_printk))
 		return 0;
 
-	if (unlikely(suppress_panic_printk) &&
-	    atomic_read(&panic_cpu) != raw_smp_processor_id())
+	if (unlikely(suppress_panic_printk) && other_cpu_in_panic())
 		return 0;
 
 	if (level == LOGLEVEL_SCHED) {
