Commit 583bfd48 authored by Nathan Chancellor's avatar Nathan Chancellor Committed by Kees Cook
Browse files

x86, lto: Enable Clang LTO for 32-bit as well 



Commit b33fff07 ("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: default avatarNathan Chancellor <nathan@kernel.org>
Reviewed-by: default avatarNick Desaulniers <ndesaulniers@google.com>
Tested-by: default avatarNick Desaulniers <ndesaulniers@google.com>
Signed-off-by: default avatarKees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20210429232611.3966964-1-nathan@kernel.org
parent 590e8a08

arch/x86/Kconfig

+2 −2
Original line number Diff line number Diff line
@@ -103,8 +103,8 @@ 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_MEMTEST

	select ARCH_USE_QUEUED_RWLOCKS