[PATCH AUTOSEL 6.8 17/68] printk: For @suppress_panic_printk check for other CPU in panic

Sasha Levin
2024-03-29T12:27:22Z

From: John Ogness <john.ogness@linutronix.de>

[ Upstream commit 0ab7cdd00491b532591ef065be706301de7e448f ]

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: Sasha Levin <sashal@kernel.org>
---
kernel/printk/printk.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
index f2444b581e16c..d9f20d222293b 100644
--- a/kernel/printk/printk.c
+++ b/kernel/printk/printk.c
@@ -2270,8 +2270,7 @@ asmlinkage int vprintk_emit(int facility, int level,
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) {
--
2.43.0