From 99fe993477b73fab9aeffb8ed96c79319f2abfff Mon Sep 17 00:00:00 2001
From: Joel Severin <joel.severin@icemanor.se>
Date: Sun, 14 Sep 2025 17:03:25 +0200
Subject: [PATCH] Allow architecture-specific panic handling

Debugging panics can be made much easier in hosted architectures (like
Wasm) if they can intercept panic() calls right when they happen.
---
 include/asm-generic/Kbuild  |  1 +
 include/asm-generic/panic.h | 12 ++++++++++++
 kernel/panic.c              |  3 +++
 3 files changed, 16 insertions(+)
 create mode 100644 include/asm-generic/panic.h

diff --git a/include/asm-generic/Kbuild b/include/asm-generic/Kbuild
index 941be574b..f1feb32a4 100644
--- a/include/asm-generic/Kbuild
+++ b/include/asm-generic/Kbuild
@@ -42,6 +42,7 @@ mandatory-y += mmu_context.h
 mandatory-y += module.h
 mandatory-y += module.lds.h
 mandatory-y += msi.h
+mandatory-y += panic.h
 mandatory-y += pci.h
 mandatory-y += percpu.h
 mandatory-y += pgalloc.h
diff --git a/include/asm-generic/panic.h b/include/asm-generic/panic.h
new file mode 100644
index 000000000..5f1a0ac69
--- /dev/null
+++ b/include/asm-generic/panic.h
@@ -0,0 +1,12 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef _ASM_GENERIC_PANIC_H
+#define _ASM_GENERIC_PANIC_H
+
+#ifndef CONFIG_ARCH_HAVE_PANIC_NOTIFY
+static inline void arch_panic_notify(const char *msg)
+{
+}
+#endif
+
+#endif /* _ASM_GENERIC_PANIC_H */
diff --git a/kernel/panic.c b/kernel/panic.c
index c990ada85..c2343cfc9 100644
--- a/kernel/panic.c
+++ b/kernel/panic.c
@@ -36,6 +36,7 @@
 #include <linux/sysfs.h>
 #include <linux/context_tracking.h>
 #include <trace/events/error_report.h>
+#include <asm/panic.h>
 #include <asm/sections.h>
 
 #define PANIC_TIMER_STEP 100
@@ -397,6 +398,8 @@ void panic(const char *fmt, ...)
 
 	panic_print_sys_info(true);
 
+	arch_panic_notify(buf);
+
 	if (!panic_blink)
 		panic_blink = no_blink;
 
-- 
2.25.1