From: Nathan Chancellor Date: Fri, 15 Aug 2025 01:31:39 +0000 (-0700) Subject: x86/build: Clean up stack alignment flags in CC_FLAGS_FPU X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=487fe3a936b0b84ef09fa324b4c01d059886f951;p=thirdparty%2Fkernel%2Fstable.git x86/build: Clean up stack alignment flags in CC_FLAGS_FPU The minimum supported version of GCC to build the x86 kernel was bumped to GCC 8.1 in a3e8fe814ad1 ("x86/build: Raise the minimum GCC version to 8.1"). Prior to GCC 7.1, '-mpreferred-stack-boundary=3' was not allowed with '-msse', so areas of the kernel that needed floating point had a different alignment. Now that GCC > 7.1 is mandatory, there is no need to have a different value of '-mpreferred-stack-boundary' from the rest of the kernel, so remove this handling from CC_FLAGS_FPU. Signed-off-by: Nathan Chancellor Signed-off-by: Borislav Petkov (AMD) Link: https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=34fac449e121be97dd073c5428cc855367b2872c Link: https://lore.kernel.org/20250814-x86-min-ver-cleanups-v1-3-ff7f19457523@kernel.org --- diff --git a/arch/x86/Makefile b/arch/x86/Makefile index f0aa58d2ec17e..0c82a610fb547 100644 --- a/arch/x86/Makefile +++ b/arch/x86/Makefile @@ -84,19 +84,7 @@ KBUILD_RUSTFLAGS += -Ctarget-feature=-sse,-sse2,-sse3,-ssse3,-sse4.1,-sse4.2,-av # CC_FLAGS_FPU := -msse -msse2 ifdef CONFIG_CC_IS_GCC -# Stack alignment mismatch, proceed with caution. -# GCC < 7.1 cannot compile code using `double` and -mpreferred-stack-boundary=3 -# (8B stack alignment). -# See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53383 -# -# The "-msse" in the first argument is there so that the -# -mpreferred-stack-boundary=3 build error: -# -# -mpreferred-stack-boundary=3 is not between 4 and 12 -# -# can be triggered. Otherwise gcc doesn't complain. CC_FLAGS_FPU += -mhard-float -CC_FLAGS_FPU += $(call cc-option,-msse -mpreferred-stack-boundary=3,-mpreferred-stack-boundary=4) endif ifeq ($(CONFIG_X86_KERNEL_IBT),y)