[PATCH RESEND] panic: Add register_panic_notifier and unregister_panic_notifier

From: Xu Qiang
Date: Sat Nov 19 2022 - 03:06:28 EST


Add two methods to manipulate panic_notifier_list and export them.
Subsequently, panic_notifier_list is changed to static variable.

Signed-off-by: Xu Qiang <xuqiang36@xxxxxxxxxx>
---
include/linux/panic_notifier.h | 3 +++
kernel/panic.c | 12 ++++++++++++
2 files changed, 15 insertions(+)

diff --git a/include/linux/panic_notifier.h b/include/linux/panic_notifier.h
index 41e32483d7a7..9543d498b90b 100644
--- a/include/linux/panic_notifier.h
+++ b/include/linux/panic_notifier.h
@@ -5,6 +5,9 @@
#include <linux/notifier.h>
#include <linux/types.h>

+int register_panic_notifier(struct notifier_block *nb);
+int unregister_panic_notifier(struct notifier_block *nb);
+
extern struct atomic_notifier_head panic_notifier_list;

extern bool crash_kexec_post_notifiers;
diff --git a/kernel/panic.c b/kernel/panic.c
index 75fe389e8814..8f34dbd389cf 100644
--- a/kernel/panic.c
+++ b/kernel/panic.c
@@ -200,6 +200,18 @@ static void panic_print_sys_info(bool console_flush)
ftrace_dump(DUMP_ALL);
}

+int register_panic_notifier(struct notifier_block *nb)
+{
+ return atomic_notifier_chain_register(&panic_notifier_list, nb);
+}
+EXPORT_SYMBOL(register_panic_notifier);
+
+int unregister_panic_notifier(struct notifier_block *nb)
+{
+ return atomic_notifier_chain_unregister(&panic_notifier_list, nb);
+}
+EXPORT_SYMBOL(unregister_panic_notifier);
+
/**
* panic - halt the system
* @fmt: The text string to print
--
2.17.1