linux-kernel - [PATCH 1/4] panic: Add panic_in

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Message-Id: <20220121190222.572694-2-stephen.s.brennan@oracle.com>
Date:   Fri, 21 Jan 2022 11:02:19 -0800
From:   Stephen Brennan <stephen.s.brennan@...cle.com>
To:     Petr Mladek <pmladek@...e.com>,
        Sergey Senozhatsky <senozhatsky@...omium.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        John Ogness <john.ogness@...utronix.de>
Cc:     Stephen Brennan <stephen.s.brennan@...cle.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH 1/4] panic: Add panic_in_progress helper

Suggested-by: Petr Mladek <pmladek@...e.com>
Signed-off-by: Stephen Brennan <stephen.s.brennan@...cle.com>
---
We cannot define a static inline without including linux/atomic.h, so
I just added a macro for convenience in later patches. Since macros were
the only option, I didn't include a helper for
panic_in_progress_different_cpu().

 include/linux/panic.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/linux/panic.h b/include/linux/panic.h
index f5844908a089..8e8bd50494d5 100644
--- a/include/linux/panic.h
+++ b/include/linux/panic.h
@@ -45,6 +45,9 @@ extern bool crash_kexec_post_notifiers;
 extern atomic_t panic_cpu;
 #define PANIC_CPU_INVALID	-1
 
+#define panic_in_progress()				\
+	unlikely(atomic_read(&panic_cpu) != PANIC_CPU_INVALID)
+
 /*
  * Only to be used by arch init code. If the user over-wrote the default
  * CONFIG_PANIC_TIMEOUT, honor it.
-- 
2.30.2