Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.34 as permitted sender) client-ip=23.128.96.34;
From:   John Ogness <john.ogness@linutronix.de>
To:     Petr Mladek <pmladek@suse.com>
Cc:     Sergey Senozhatsky <senozhatsky@chromium.org>,
        Steven Rostedt <rostedt@goodmis.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        linux-kernel@vger.kernel.org
Subject: [PATCH printk v2 1/4] printk: For @suppress_panic_printk check other panic
Date:   Fri, 13 Oct 2023 22:49:37 +0206
Message-Id: <20231013204340.1112036-2-john.ogness@linutronix.de>
In-Reply-To: <20231013204340.1112036-1-john.ogness@linutronix.de>
References: <20231013204340.1112036-1-john.ogness@linutronix.de>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

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>
---
 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 80eb79177bab..abb6a50ee26f 100644
--- a/kernel/printk/printk.c
+++ b/kernel/printk/printk.c
@@ -2272,8 +2272,7 @@ 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) {
-- 
2.39.2