linux-kernel - Re: [PATCH 03/26] virt: Declare and define vfio_file_set_kvm() iff CONFIG

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Message-ID: <20230918151804.GH13795@ziepe.ca>
Date:   Mon, 18 Sep 2023 12:18:04 -0300
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     Sean Christopherson <seanjc@...gle.com>
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Marc Zyngier <maz@...nel.org>,
        Oliver Upton <oliver.upton@...ux.dev>,
        Huacai Chen <chenhuacai@...nel.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Anup Patel <anup@...infault.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Janosch Frank <frankja@...ux.ibm.com>,
        Claudio Imbrenda <imbrenda@...ux.ibm.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Tony Krowiak <akrowiak@...ux.ibm.com>,
        Halil Pasic <pasic@...ux.ibm.com>,
        Jason Herne <jjherne@...ux.ibm.com>,
        Harald Freudenberger <freude@...ux.ibm.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        Andy Lutomirski <luto@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.linux.dev,
        linux-mips@...r.kernel.org, kvm@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, kvm-riscv@...ts.infradead.org,
        linux-riscv@...ts.infradead.org, linux-s390@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        Anish Ghulati <aghulati@...gle.com>,
        Venkatesh Srinivas <venkateshs@...omium.org>,
        Andrew Thornton <andrewth@...gle.com>
Subject: Re: [PATCH 03/26] virt: Declare and define vfio_file_set_kvm() iff
 CONFIG_KVM is enabled

On Fri, Sep 15, 2023 at 05:30:55PM -0700, Sean Christopherson wrote:
> Hide vfio_file_set_kvm() and its unique helpers if KVM is not enabled,
> nothing else in the kernel (or out of the kernel) should be using a
> KVM specific helper.
> 
> Signed-off-by: Sean Christopherson <seanjc@...gle.com>
> ---
>  drivers/vfio/vfio_main.c | 2 +-
>  include/linux/vfio.h     | 2 ++
>  2 files changed, 3 insertions(+), 1 deletion(-)

Patch subject should be vfio not virt

Reviewed-by: Jason Gunthorpe <jgg@...dia.com>

> @@ -1388,6 +1387,7 @@ void vfio_file_set_kvm(struct file *file, struct kvm *kvm)
>  		vfio_device_file_set_kvm(file, kvm);
>  }
>  EXPORT_SYMBOL_GPL(vfio_file_set_kvm);
> +#endif

We could even put this in a symbol namespace..

Jason