linux-kernel - [PATCH v4 56/63] livepatch: Add CONFIG_KLP

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Message-ID: <9240e1a1d47df784cdc2b2f7f0c4126455749843.1758067943.git.jpoimboe@kernel.org>
Date: Wed, 17 Sep 2025 09:04:04 -0700
From: Josh Poimboeuf <jpoimboe@...nel.org>
To: x86@...nel.org
Cc: linux-kernel@...r.kernel.org,
	Petr Mladek <pmladek@...e.com>,
	Miroslav Benes <mbenes@...e.cz>,
	Joe Lawrence <joe.lawrence@...hat.com>,
	live-patching@...r.kernel.org,
	Song Liu <song@...nel.org>,
	laokz <laokz@...mail.com>,
	Jiri Kosina <jikos@...nel.org>,
	Marcos Paulo de Souza <mpdesouza@...e.com>,
	Weinan Liu <wnliu@...gle.com>,
	Fazla Mehrab <a.mehrab@...edance.com>,
	Chen Zhongjin <chenzhongjin@...wei.com>,
	Puranjay Mohan <puranjay@...nel.org>,
	Dylan Hatch <dylanbhatch@...gle.com>,
	Peter Zijlstra <peterz@...radead.org>
Subject: [PATCH v4 56/63] livepatch: Add CONFIG_KLP_BUILD

In preparation for introducing klp-build, add a new CONFIG_KLP_BUILD
option.  The initial version will only be supported on x86-64.

Signed-off-by: Josh Poimboeuf <jpoimboe@...nel.org>
---
 arch/x86/Kconfig         |  1 +
 kernel/livepatch/Kconfig | 12 ++++++++++++
 2 files changed, 13 insertions(+)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 19b1dbc8d5d26..986d31587e999 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -260,6 +260,7 @@ config X86
 	select HAVE_FUNCTION_ERROR_INJECTION
 	select HAVE_KRETPROBES
 	select HAVE_RETHOOK
+	select HAVE_KLP_BUILD			if X86_64
 	select HAVE_LIVEPATCH			if X86_64
 	select HAVE_MIXED_BREAKPOINTS_REGS
 	select HAVE_MOD_ARCH_SPECIFIC
diff --git a/kernel/livepatch/Kconfig b/kernel/livepatch/Kconfig
index 53d51ed619a3d..4c0a9c18d0b25 100644
--- a/kernel/livepatch/Kconfig
+++ b/kernel/livepatch/Kconfig
@@ -18,3 +18,15 @@ config LIVEPATCH
 	  module uses the interface provided by this option to register
 	  a patch, causing calls to patched functions to be redirected
 	  to new function code contained in the patch module.
+
+config HAVE_KLP_BUILD
+	bool
+	help
+	  Arch supports klp-build
+
+config KLP_BUILD
+	def_bool y
+	depends on LIVEPATCH && HAVE_KLP_BUILD
+	select OBJTOOL
+	help
+	  Enable klp-build support
-- 
2.50.0