linux-kernel - [PATCH v5 03/15] objtool: Allow an architecture to disable objtool on ASM files

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Message-ID: <cd0fcb6c1f0b4b1e8ece9c47dcd57dac9055a17c.1736955567.git.christophe.leroy@csgroup.eu>
Date: Wed, 15 Jan 2025 23:42:43 +0100
From: Christophe Leroy <christophe.leroy@...roup.eu>
To: Josh Poimboeuf <jpoimboe@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Nathan Chancellor <nathan@...nel.org>,
	Nick Desaulniers <ndesaulniers@...gle.com>,
	Bill Wendling <morbo@...gle.com>,
	Justin Stitt <justinstitt@...gle.com>,
	Julien Thierry <jthierry@...hat.com>,
	Miroslav Benes <mbenes@...e.cz>,
	Raphael Gault <raphael.gault@....com>,
	Michael Ellerman <mpe@...erman.id.au>,
	Nicholas Piggin <npiggin@...il.com>,
	Naveen N Rao <naveen@...nel.org>,
	Madhavan Srinivasan <maddy@...ux.ibm.com>
Cc: Christophe Leroy <christophe.leroy@...roup.eu>,
	linux-kernel@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org,
	llvm@...ts.linux.dev
Subject: [PATCH v5 03/15] objtool: Allow an architecture to disable objtool on ASM files

Supporting objtool on ASM files requires quite an effort.

Features like UACCESS validation don't require ASM files validation.

In order to allow architectures to enable objtool validation
without spending unnecessary effort on cleaning up ASM files,
provide an option to disable objtool validation on ASM files.

Suggested-by: Naveen N Rao <naveen@...nel.org>
Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
---
 arch/Kconfig         | 5 +++++
 scripts/Makefile.lib | 4 ++++
 2 files changed, 9 insertions(+)

diff --git a/arch/Kconfig b/arch/Kconfig
index 6682b2a53e34..137ef643e865 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -1305,6 +1305,11 @@ config ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT
 config HAVE_OBJTOOL
 	bool
 
+config ARCH_OBJTOOL_SKIP_ASM
+	bool
+	help
+	  Architecture doesn't support objtool on ASM files
+
 config HAVE_JUMP_LABEL_HACK
 	bool
 
diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
index 7395200538da..3c5e6de76b11 100644
--- a/scripts/Makefile.lib
+++ b/scripts/Makefile.lib
@@ -325,7 +325,11 @@ define rule_cc_o_c
 endef
 
 quiet_cmd_as_o_S = AS $(quiet_modtag)  $@
+ifndef CONFIG_ARCH_OBJTOOL_SKIP_ASM
       cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $< $(cmd_objtool)
+else
+      cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
+endif
 
 define rule_as_o_S
 	$(call cmd_and_fixdep,as_o_S)
-- 
2.47.0