Messages in this thread | | | From | Arnd Bergmann <> | Date | Mon, 25 Jul 2022 16:35:38 +0200 | Subject | Re: [linux-stable-rc:linux-5.15.y 6874/8723] arch/arm/lib/xor-neon.c:30:2: warning: This code requires at least version 4.6 of GCC |
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On Mon, Jul 25, 2022 at 2:55 PM Arnd Bergmann <arnd@kernel.org> wrote:
> The other easy workaround would be to just turn off the xor-neon code > when building with clang, e.g. using this Makefile hack: > > diff --git a/arch/arm/lib/Makefile b/arch/arm/lib/Makefile > index 6d2ba454f25b..8e4fe6421dd2 100644 > --- a/arch/arm/lib/Makefile > +++ b/arch/arm/lib/Makefile > @@ -43,8 +43,10 @@ endif > $(obj)/csumpartialcopy.o: $(obj)/csumpartialcopygeneric.S > $(obj)/csumpartialcopyuser.o: $(obj)/csumpartialcopygeneric.S > > +ifdef CONFIG_CC_IS_CLANG > ifeq ($(CONFIG_KERNEL_MODE_NEON),y) > NEON_FLAGS := -march=armv7-a -mfloat-abi=softfp -mfpu=neon > CFLAGS_xor-neon.o += $(NEON_FLAGS) > obj-$(CONFIG_XOR_BLOCKS) += xor-neon.o > endif > +endif
Nevermind, this does not actually work. Just turning off the warning is probably best then, as actually disabling this code would still be invasive not do much beyond saving a little bit of kernel .text size.
Arnd
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