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authorStephen Brennan <stephen.s.brennan@oracle.com>2022-02-02 09:18:18 -0800
committerPetr Mladek <pmladek@suse.com>2022-02-14 13:39:20 +0100
commit77498617857f68496b360081dde1a492d40c28b2 (patch)
tree292499391fc52f5875c2a62d2a8f170cc1e1a2b9 /kernel/printk
parenta229327733b86aa585effdb0d27a87b12aa51597 (diff)
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 <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
Diffstat (limited to 'kernel/printk')
-rw-r--r--kernel/printk/printk.c5
1 files changed, 5 insertions, 0 deletions
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