Commit 2f2b4fd6 authored by Paul Burton's avatar Paul Burton

MIPS: Disable Loongson MMI instructions for kernel build

GCC 9.x automatically enables support for Loongson MMI instructions when
using some -march= flags, and then errors out when -msoft-float is
specified with:

  cc1: error: ‘-mloongson-mmi’ must be used with ‘-mhard-float’

The kernel shouldn't be using these MMI instructions anyway, just as it
doesn't use floating point instructions. Explicitly disable them in
order to fix the build with GCC 9.x.
Signed-off-by: default avatarPaul Burton <paul.burton@mips.com>
Fixes: 3702bba5 ("MIPS: Loongson: Add GCC 4.4 support for Loongson2E")
Fixes: 6f7a251a ("MIPS: Loongson: Add basic Loongson 2F support")
Fixes: 5188129b ("MIPS: Loongson-3: Improve -march option and move it to Platform")
Cc: Huacai Chen <chenhc@lemote.com>
Cc: Jiaxun Yang <jiaxun.yang@flygoat.com>
Cc: stable@vger.kernel.org # v2.6.32+
Cc: linux-mips@vger.kernel.org
parent 38dffe1e
...@@ -66,6 +66,10 @@ else ...@@ -66,6 +66,10 @@ else
$(call cc-option,-march=mips64r2,-mips64r2 -U_MIPS_ISA -D_MIPS_ISA=_MIPS_ISA_MIPS64) $(call cc-option,-march=mips64r2,-mips64r2 -U_MIPS_ISA -D_MIPS_ISA=_MIPS_ISA_MIPS64)
endif endif
# Some -march= flags enable MMI instructions, and GCC complains about that
# support being enabled alongside -msoft-float. Thus explicitly disable MMI.
cflags-y += $(call cc-option,-mno-loongson-mmi)
# #
# Loongson Machines' Support # Loongson Machines' Support
# #
......
...@@ -15,6 +15,7 @@ ccflags-vdso := \ ...@@ -15,6 +15,7 @@ ccflags-vdso := \
$(filter -mmicromips,$(KBUILD_CFLAGS)) \ $(filter -mmicromips,$(KBUILD_CFLAGS)) \
$(filter -march=%,$(KBUILD_CFLAGS)) \ $(filter -march=%,$(KBUILD_CFLAGS)) \
$(filter -m%-float,$(KBUILD_CFLAGS)) \ $(filter -m%-float,$(KBUILD_CFLAGS)) \
$(filter -mno-loongson-%,$(KBUILD_CFLAGS)) \
-D__VDSO__ -D__VDSO__
ifdef CONFIG_CC_IS_CLANG ifdef CONFIG_CC_IS_CLANG
......
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