From: John Ogness Date: Fri, 13 Oct 2023 20:13:02 +0000 Subject: [PATCH 06/50] printk: For @suppress_panic_printk check for other CPU in panic Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/6.7/older/patches-6.7-rt6.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 Reviewed-by: Petr Mladek Signed-off-by: Sebastian Andrzej Siewior --- kernel/printk/printk.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) --- a/kernel/printk/printk.c +++ b/kernel/printk/printk.c @@ -2270,8 +2270,7 @@ 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) {