From 77498617857f68496b360081dde1a492d40c28b2 Mon Sep 17 00:00:00 2001 From: Stephen Brennan Date: Wed, 2 Feb 2022 09:18:18 -0800 Subject: printk: Add panic_in_progress helper 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 Signed-off-by: Stephen Brennan Reviewed-by: Petr Mladek Reviewed-by: Sergey Senozhatsky Signed-off-by: Petr Mladek Link: https://lore.kernel.org/r/20220202171821.179394-2-stephen.s.brennan@oracle.com --- kernel/printk/printk.c | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'kernel/printk') 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 -- cgit v1.2.3