linux-kernel - [PATCH] LoongArch: Add klp-build support for live patching

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Message-ID: <20251203091039.125259-1-wangyuli@aosc.io>
Date: Wed,  3 Dec 2025 17:10:39 +0800
From: WangYuli <wangyuli@...c.io>
To: jpoimboe@...nel.org,
	peterz@...radead.org,
	chenhuacai@...nel.org,
	kernel@...0n.name
Cc: yangtiezhu@...ngson.cn,
	pmladek@...e.com,
	alexandre.chartre@...cle.com,
	wangyuli@...c.io,
	linux-kernel@...r.kernel.org,
	loongarch@...ts.linux.dev,
	guanwentao@...ontech.com,
	WangYuli <wangyl5933@...naunicom.cn>
Subject: [PATCH] LoongArch: Add klp-build support for live patching

From: WangYuli <wangyl5933@...naunicom.cn>

Add klp-build support for the LoongArch architecture, enabling
automated live patch module generation using objtool.

Signed-off-by: WangYuli <wangyl5933@...naunicom.cn>
---
 arch/loongarch/Kconfig                | 1 +
 tools/objtool/Makefile                | 3 ++-
 tools/objtool/arch/loongarch/decode.c | 5 +++++
 3 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/arch/loongarch/Kconfig b/arch/loongarch/Kconfig
index 1a0a5f9def33..7b5f2a329908 100644
--- a/arch/loongarch/Kconfig
+++ b/arch/loongarch/Kconfig
@@ -159,6 +159,7 @@ config LOONGARCH
 	select HAVE_KPROBES
 	select HAVE_KPROBES_ON_FTRACE
 	select HAVE_KRETPROBES
+	select HAVE_KLP_BUILD
 	select HAVE_LIVEPATCH
 	select HAVE_MOD_ARCH_SPECIFIC
 	select HAVE_NMI
diff --git a/tools/objtool/Makefile b/tools/objtool/Makefile
index ad6e1ec706ce..cead37c25a69 100644
--- a/tools/objtool/Makefile
+++ b/tools/objtool/Makefile
@@ -8,7 +8,8 @@ ifeq ($(SRCARCH),x86)
 endif
 
 ifeq ($(SRCARCH),loongarch)
-	BUILD_ORC	   := y
+	BUILD_ORC    := y
+	ARCH_HAS_KLP := y
 endif
 
 ifeq ($(ARCH_HAS_KLP),y)
diff --git a/tools/objtool/arch/loongarch/decode.c b/tools/objtool/arch/loongarch/decode.c
index 6cd288150f49..674e4efd138f 100644
--- a/tools/objtool/arch/loongarch/decode.c
+++ b/tools/objtool/arch/loongarch/decode.c
@@ -34,6 +34,11 @@ s64 arch_insn_adjusted_addend(struct instruction *insn, struct reloc *reloc)
 	return reloc_addend(reloc);
 }
 
+u64 arch_adjusted_addend(struct reloc *reloc)
+{
+	return reloc_addend(reloc);
+}
+
 bool arch_pc_relative_reloc(struct reloc *reloc)
 {
 	return false;
-- 
2.51.0