From: Tiezhu Yang <yangtiezhu@loongson.cn>
Date: Wed, 31 Dec 2025 07:19:10 +0000 (+0800)
Subject: LoongArch: Use UNWIND_HINT_END_OF_STACK for entry points
X-Git-Tag: v6.19-rc4~11^2~11
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1b2f4706c6a20ab6ac41533dd8032d54322076e3;p=thirdparty%2Fkernel%2Fstable.git

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@kernel.org>
Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
---

diff --git a/arch/loongarch/kernel/head.S b/arch/loongarch/kernel/head.S
index aba548db24460..ce7f6c04f4ab4 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