linux-kernel - [PATCH 1/2] LoongArch: Use UNWIND_HINT_END_OF

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Message-ID: <20251224103516.12654-2-yangtiezhu@loongson.cn>
Date: Wed, 24 Dec 2025 18:35:15 +0800
From: Tiezhu Yang <yangtiezhu@...ngson.cn>
To: Huacai Chen <chenhuacai@...nel.org>
Cc: Josh Poimboeuf <jpoimboe@...nel.org>,
	loongarch@...ts.linux.dev,
	linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] LoongArch: Use UNWIND_HINT_END_OF_STACK for entry points

kernel_entry() and smpboot_entry() are the last frames for ORC unwinder,
so it is proper to use the annotation UNWIND_HINT_END_OF_STACK for them.

Link: https://lore.kernel.org/lkml/ots6w2ntyudj5ucs5eowncta2vmfssatpcqwzpar3ekk577hxi@j45dd4dmwx6x/
Suggested-by: Josh Poimboeuf <jpoimboe@...nel.org>
Signed-off-by: Tiezhu Yang <yangtiezhu@...ngson.cn>
---
 arch/loongarch/kernel/head.S | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/loongarch/kernel/head.S b/arch/loongarch/kernel/head.S
index aba548db2446..ce7f6c04f4ab 100644
--- a/arch/loongarch/kernel/head.S
+++ b/arch/loongarch/kernel/head.S
@@ -42,6 +42,7 @@ SYM_DATA(kernel_fsize, .long _kernel_fsize);
 	.align 12
 
 SYM_CODE_START(kernel_entry)			# kernel entry point
+	UNWIND_HINT_END_OF_STACK
 
 	SETUP_TWINS
 	SETUP_MODES	t0
@@ -113,6 +114,7 @@ SYM_CODE_END(kernel_entry)
  * function after setting up the stack and tp registers.
  */
 SYM_CODE_START(smpboot_entry)
+	UNWIND_HINT_END_OF_STACK
 
 	SETUP_TWINS
 	SETUP_MODES	t0
-- 
2.42.0