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Message-ID: <f63abe64-6d4f-1374-5fd3-874a34c1c22f@molgen.mpg.de>
Date:   Sun, 13 Feb 2022 10:45:11 +0100
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Subject: Re: Set environment variable `KVM` makes build fail
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To:     Zhouyi Zhou <zhouzhouyi@gmail.com>
Cc:     Paolo Bonzini <pbonzini@redhat.com>, kvm@vger.kernel.org,
        Masahiro Yamada <masahiroy@kernel.org>,
        Michal Marek <michal.lkml@markovi.net>,
        linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org,
        rcu <rcu@vger.kernel.org>,
        "Paul E. McKenney" <paulmck@kernel.org>
References: <d3e6a461-5b37-ecfb-d63c-d35af27f2682@molgen.mpg.de>
 <CAABZP2yOA2n-xux8uUC72vVYc14JfCawoOzp_pnTGDvY8cRSnw@mail.gmail.com>
From:   Paul Menzel <pmenzel@molgen.mpg.de>
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Dear Zhouyi,


Am 13.02.22 um 09:07 schrieb Zhouyi Zhou:, and

> Thank you for your trust in me.

Thank you for your help.

> I think the following patch has a good explanation of what happened ;-)
> https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/tools/testing/selftests/rcutorture/bin/torture.sh?id=a7d89cfb8e1269cb6d22453adba56b8d0218589f
> "The torture-test scripting's long-standing use of KVM as the
> environment variable tracking the pathname of the rcutorture directory
> now conflicts with allmodconfig builds due to the
> virt/kvm/Makefile.kvm file's use of this as a makefile variable"

Indeed. In my script I had added the remote for the rcu git archive, but 
forgot to actually fetch the objects and refs, and missed the error 
message in the output.

Sorry for the noise, though the variable name should probably 
namespaced, as at least for the name `KVM` the chance are higher (still 
very small) that it’s set in the environment.


Kind regards,

Paul