[PATCH v4 1/3] panic: Introduce arch_do_panic

[Mete Durlu <meted@linux.ibm.com>]

Introduce a hook for architectures to put their specific panic handlers.
s390 and sparc already has ifdef preprocessor checks to execute
architecture specific code. Pave the way for vpanic() cleanup.

Reviewed-by: Bradley Morgan <include@grrlz.net>
Suggested-by: Sven Schnelle <svens@linux.ibm.com>
Signed-off-by: Mete Durlu <meted@linux.ibm.com>
---
 include/linux/panic.h | 2 ++
 kernel/panic.c        | 3 +++
 2 files changed, 5 insertions(+)

diff --git a/include/linux/panic.h b/include/linux/panic.h
index f1dd417e54b2..98dd7dfd27de 100644
--- a/include/linux/panic.h
+++ b/include/linux/panic.h
@@ -110,4 +110,6 @@ extern void add_taint(unsigned flag, enum lockdep_ok);
 extern int test_taint(unsigned flag);
 extern unsigned long get_taint(void);
 
+void arch_do_panic(void);
+
 #endif	/* _LINUX_PANIC_H */
diff --git a/kernel/panic.c b/kernel/panic.c
index 213725b612aa..726a97842232 100644
--- a/kernel/panic.c
+++ b/kernel/panic.c
@@ -567,6 +567,8 @@ static void panic_other_cpus_shutdown(bool crash_kexec)
 		crash_smp_send_stop();
 }
 
+void __weak arch_do_panic(void) {}
+
 /**
  * vpanic - halt the system
  * @fmt: The text string to print
@@ -756,6 +758,7 @@ void vpanic(const char *fmt, va_list args)
 #endif
 	pr_emerg("---[ end Kernel panic - not syncing: %s ]---\n", buf);
 
+	arch_do_panic();
 	/* Do not scroll important messages printed above */
 	suppress_printk = 1;
 

-- 
2.55.0