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From: Nathan Chancellor <nathan@kernel.org>
To: Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
	x86@kernel.org, Sami Tolvanen <samitolvanen@google.com>,
	Kees Cook <keescook@chromium.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>,
	Nick Desaulniers <ndesaulniers@google.com>,
	linux-kernel@vger.kernel.org, clang-built-linux@googlegroups.com,
	Nathan Chancellor <nathan@kernel.org>
Subject: [PATCH] x86: Enable clang LTO for 32-bit as well
Date: Thu, 29 Apr 2021 16:26:12 -0700	[thread overview]
Message-ID: <20210429232611.3966964-1-nathan@kernel.org> (raw)

Commit b33fff07e3e3 ("x86, build: allow LTO to be selected") enabled
support for LTO for x86_64 but 32-bit works fine as well.

I tested the following config combinations:

* i386_defconfig + CONFIG_LTO_CLANG_FULL=y

* i386_defconfig + CONFIG_LTO_CLANG_THIN=y

* ARCH=i386 allmodconfig + CONFIG_LTO_CLANG_THIN=y

with LLVM 11.1.0, 12.0.0, and 13.0.0 from git without any build
failures. The defconfigs boot in QEMU with no new warnings.

Signed-off-by: Nathan Chancellor <nathan@kernel.org>
---
 arch/x86/Kconfig | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 0fc82237414d..d8a919d9535e 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -97,8 +97,8 @@ config X86
 	select ARCH_SUPPORTS_DEBUG_PAGEALLOC
 	select ARCH_SUPPORTS_NUMA_BALANCING	if X86_64
 	select ARCH_SUPPORTS_KMAP_LOCAL_FORCE_MAP	if NR_CPUS <= 4096
-	select ARCH_SUPPORTS_LTO_CLANG		if X86_64
-	select ARCH_SUPPORTS_LTO_CLANG_THIN	if X86_64
+	select ARCH_SUPPORTS_LTO_CLANG
+	select ARCH_SUPPORTS_LTO_CLANG_THIN
 	select ARCH_USE_BUILTIN_BSWAP
 	select ARCH_USE_QUEUED_RWLOCKS
 	select ARCH_USE_QUEUED_SPINLOCKS

base-commit: d8201efe75e13146ebde433745c7920e15593baf
-- 
2.31.1.362.g311531c9de


             reply	other threads:[~2021-04-29 23:26 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-29 23:26 Nathan Chancellor [this message]
2021-04-30 20:58 ` Nick Desaulniers
2021-04-30 23:04   ` Kees Cook
2021-06-10 17:11 ` Kees Cook

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