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x86/build: Clean up stack alignment flags in CC_FLAGS_FPU

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The minimum supported version of GCC to build the x86 kernel was bumped
to GCC 8.1 in

  a3e8fe814a ("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 <nathan@kernel.org>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
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
This commit is contained in:
Nathan Chancellor
2025-08-14 18:31:39 -07:00
committed by Borislav Petkov (AMD)
parent d87208128a
commit 487fe3a936
1 changed files with 0 additions and 12 deletions
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12
arch/x86/Makefile
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@@ -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)