linux-kernel - [PATCH v2 07/14] objtool: Allow an architecture to disable objtool on ASM files

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Date:   Thu, 22 Jun 2023 12:54:29 +0200
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Michael Ellerman <mpe@...erman.id.au>,
        Nicholas Piggin <npiggin@...il.com>,
        Josh Poimboeuf <jpoimboe@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Sathvika Vasireddy <sv@...ux.ibm.com>,
        Naveen N Rao <naveen@...nel.org>
Cc:     Christophe Leroy <christophe.leroy@...roup.eu>,
        linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH v2 07/14] 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.build | 4 ++++
 2 files changed, 9 insertions(+)

diff --git a/arch/Kconfig b/arch/Kconfig
index 205fd23e0cad..dd66b884bcfb 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -1091,6 +1091,11 @@ 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.build b/scripts/Makefile.build
index 9f94fc83f086..878027cf4faf 100644
--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -359,7 +359,11 @@ $(obj)/%.s: $(src)/%.S FORCE
 	$(call if_changed_dep,cpp_s_S)
 
 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
 
 ifdef CONFIG_ASM_MODVERSIONS
 
-- 
2.40.1