[PATCH 1/4] panic: Add panic_in_progress helper

[Stephen Brennan]

Suggested-by: Petr Mladek <pmladek@xxxxxxxx>
Signed-off-by: Stephen Brennan <stephen.s.brennan@xxxxxxxxxx>
---
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