linux-kernel - Re: [PATCH v2 4/4] kbuild: use $(src) instead of $(srctree)/$(src) for source directory

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Date: Thu, 27 Jun 2024 17:13:48 +0000
From: "Edgecombe, Rick P" <rick.p.edgecombe@...el.com>
To: "masahiroy@...nel.org" <masahiroy@...nel.org>, "krzk@...nel.org"
	<krzk@...nel.org>
CC: "nicolas@...sle.eu" <nicolas@...sle.eu>, "conor@...nel.org"
	<conor@...nel.org>, "robh@...nel.org" <robh@...nel.org>,
	"linux-kbuild@...r.kernel.org" <linux-kbuild@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH v2 4/4] kbuild: use $(src) instead of $(srctree)/$(src)
 for source directory

On Fri, 2024-05-10 at 04:36 +0900, Masahiro Yamada wrote:
> 
> Or, fix the code.
> 
> 
> Now fixed. Thanks for the report.
> 

Hi,

This commit broke my build in a similar way:
make ARCH=x86_64 O=../linux-tdx-kvm-out/ -j36 M=arch/x86/kvm/
make[1]: Entering directory '/home/rpedgeco/repos/linux-tdx-kvm-out'
/home/rpedgeco/repos/linux/scripts/Makefile.build:41: arch/x86/kvm/Makefile: No
such file or directory
make[3]: *** No rule to make target 'arch/x86/kvm/Makefile'.  Stop.
make[2]: *** [/home/rpedgeco/repos/linux/Makefile:1934: arch/x86/kvm] Error 2
make[1]: *** [/home/rpedgeco/repos/linux/Makefile:240: __sub-make] Error 2
make[1]: Leaving directory '/home/rpedgeco/repos/linux-tdx-kvm-out'
make: *** [Makefile:240: __sub-make] Error 2

This patch didn’t fix it:
https://lore.kernel.org/lkml/20240624-kbuild-fix-xconfig-v1-1-7c06eae6d3aa@avm.de/

But reverting b1992c3772e6 ("kbuild: use $(src) instead of $(srctree)/$(src) for
source directory") does.

I'm guess it has something to do with the "M=" option because:
make ARCH=x86_64 O=../linux-tdx-kvm-out/ -j36 arch/x86/kvm/kvm.ko
arch/x86/kvm/kvm-intel.ko

...works.