[PATCH] kbuild: Bump the build system to 6.1

[David Lechner]

On 12/16/25 3:16 AM, Ilias Apalodimas wrote:
> From: Sughosh Ganu <sughosh.ganu at linaro.org>
> 
> Our last sync with the kernel was 5.1.
> 
> We are so out of sync now, that tracking the patches and backporting
> them one by one makes little sense and it's going to take ages.
> 
> This is an attempt to sync up Makefiles to 6.1.
> Unfortunately due to sheer amount of patches this is not easy to review,
> but that's what we decided during a community call for the bump to 5.1,
> so we are following the same guidelines here.
> 
> Signed-off-by: Sughosh Ganu <sughosh.ganu at linaro.org>
> Signed-off-by: Ilias Apalodimas <ilias.apalodimas at linaro.org>a #rebased on -next
> 

...

> @@ -129,14 +131,14 @@ include/config.h: scripts/Makefile.autoconf create_symlink FORCE
>  PHONY += create_symlink
>  create_symlink:
>  ifdef CONFIG_CREATE_ARCH_SYMLINK
> -ifneq ($(KBUILD_SRC),)
> +ifdef building_out_of_srctree
>  	$(Q)mkdir -p include/asm
> -	$(Q)if [ -d $(KBUILD_SRC)/arch/$(ARCH)/mach-$(SOC)/include/mach ]; then	\
> +	$(Q)if [ -d $(srctree)/arch/$(ARCH)/mach-$(SOC)/include/mach ]; then	\
>  		dest=arch/$(ARCH)/mach-$(SOC)/include/mach;			\
>  	else									\
>  		dest=arch/$(ARCH)/include/asm/arch-$(if $(SOC),$(SOC),$(CPU));	\
>  	fi;									\
> -	ln -fsn $(KBUILD_SRC)/$$dest include/asm/arch
> +	ln -fsn $(srctree)/$$dest include/asm/arch
>  else
>  	$(Q)if [ -d arch/$(ARCH)/mach-$(SOC)/include/mach ]; then	\
>  		dest=../../mach-$(SOC)/include/mach;			\
This breaks out-of-tree builds because the symlink created is broken. For example,
I have O=build-mt8365_evk so the build directory is a subdirectory of the source
directory. This causes $(srctree) to be ".." and therefore the link is:

build-mt8365_evk/include/asm/arch -> ../arch/arm/include/asm/arch-mediatek

Obviously, there should be a few more ../ in there or it should use an absolute
path. I'm guessing previously $(KBUILD_SRC) was an absolute path?

I will see if I can come up with a fix unless someone has any immediate suggestions.