From: John Ogness <john.ogness@linutronix.de>
Date: Wed, 7 Feb 2024 14:46:55 +0106
Subject: [PATCH 02/48] printk: For @suppress_panic_printk check for other CPU
 in panic

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>
Link: https://lore.kernel.org/r/20240207134103.1357162-7-john.ogness@linutronix.de
Signed-off-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(-)

Index: linux-6.8.2-rt10/kernel/printk/printk.c
===================================================================
@ linux-6.8.2-rt10/kernel/printk/printk.c:2325 @ 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) {