linux-kernel - [PATCH] x86/Kconfig: Allow X86_X32_ABI with llvm-objcopy in some cases

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Date:   Fri,  1 Jul 2022 17:04:37 -0400
From:   "Alex Xu (Hello71)" <alex_y_xu@...oo.ca>
To:     Nathan Chancellor <nathan@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>, x86@...nel.org,
        llvm@...ts.linux.dev
Cc:     Andy Lutomirski <luto@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Masahiro Yamada <masahiroy@...nel.org>,
        linux-kernel@...r.kernel.org,
        "Alex Xu (Hello71)" <alex_y_xu@...oo.ca>
Subject: [PATCH] x86/Kconfig: Allow X86_X32_ABI with llvm-objcopy in some cases

According to the comment and commit message, there are issues compiling
with IBT and/or compressed debug sections. Therefore, the condition
should be restricted to when those are enabled.

Signed-off-by: Alex Xu (Hello71) <alex_y_xu@...oo.ca>
---
 arch/x86/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index be0b95e51df6..e5af1088420e 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -2847,7 +2847,7 @@ config X86_X32_ABI
 	# compressed debug sections to x86_x32 properly:
 	# https://github.com/ClangBuiltLinux/linux/issues/514
 	# https://github.com/ClangBuiltLinux/linux/issues/1141
-	depends on $(success,$(OBJCOPY) --version | head -n1 | grep -qv llvm)
+	depends on !X86_KERNEL_IBT || !DEBUG_INFO_COMPRESSED || $(success,$(OBJCOPY) --version | head -n1 | grep -qv llvm)
 	help
 	  Include code to run binaries for the x32 native 32-bit ABI
 	  for 64-bit processors.  An x32 process gets access to the
-- 
2.36.1