From 77498617857f68496b360081dde1a492d40c28b2 Mon Sep 17 00:00:00 2001
From: Stephen Brennan <stephen.s.brennan@oracle.com>
Date: Wed, 2 Feb 2022 09:18:18 -0800
Subject: [PATCH] printk: Add panic_in_progress helper
Git-commit: 77498617857f68496b360081dde1a492d40c28b2
Patch-mainline: v5.18-rc1
References: bsc#1197894
This will be used help avoid deadlocks during panics. Although it would
be better to include this in linux/panic.h, it would require that header
to include linux/atomic.h as well. On some architectures, this results
in a circular dependency as well. So instead add the helper directly to
printk.c.
Suggested-by: Petr Mladek <pmladek@suse.com>
Signed-off-by: Stephen Brennan <stephen.s.brennan@oracle.com>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Reviewed-by: Sergey Senozhatsky <senozhatsky@chromium.org>
Signed-off-by: Petr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/20220202171821.179394-2-stephen.s.brennan@oracle.com
---
kernel/printk/printk.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
index 155229f0cf0f..f04bbed0aa79 100644
--- a/kernel/printk/printk.c
+++ b/kernel/printk/printk.c
@@ -256,6 +256,11 @@ static void __up_console_sem(unsigned long ip)
}
#define up_console_sem() __up_console_sem(_RET_IP_)
+static bool panic_in_progress(void)
+{
+ return unlikely(atomic_read(&panic_cpu) != PANIC_CPU_INVALID);
+}
+
/*
* This is used for debugging the mess that is the VT code by
* keeping track if we have the console semaphore held. It's
--
2.26.2