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Message-Id: <20220330115303.1672616-11-sashal@kernel.org>
Date: Wed, 30 Mar 2022 07:52:52 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc: Stephen Brennan <stephen.s.brennan@...cle.com>,
Petr Mladek <pmladek@...e.com>,
Sergey Senozhatsky <senozhatsky@...omium.org>,
Sasha Levin <sashal@...nel.org>, linux@...ck-us.net
Subject: [PATCH AUTOSEL 4.19 11/22] printk: Add panic_in_progress helper
From: Stephen Brennan <stephen.s.brennan@...cle.com>
[ Upstream commit 77498617857f68496b360081dde1a492d40c28b2 ]
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@...e.com>
Signed-off-by: Stephen Brennan <stephen.s.brennan@...cle.com>
Reviewed-by: Petr Mladek <pmladek@...e.com>
Reviewed-by: Sergey Senozhatsky <senozhatsky@...omium.org>
Signed-off-by: Petr Mladek <pmladek@...e.com>
Link: https://lore.kernel.org/r/20220202171821.179394-2-stephen.s.brennan@oracle.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
kernel/printk/printk.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
index 57742e193214..9a5ce47e0a58 100644
--- a/kernel/printk/printk.c
+++ b/kernel/printk/printk.c
@@ -246,6 +246,11 @@ 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
--
2.34.1
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