linux-kernel - Re: [PATCH v4 04/12] vfio_pci: make common functions be extern

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Date:   Wed, 15 Jan 2020 11:56:05 +0100
From:   Cornelia Huck <cohuck@...hat.com>
To:     Liu Yi L <yi.l.liu@...el.com>
Cc:     alex.williamson@...hat.com, kwankhede@...dia.com,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        kevin.tian@...el.com, joro@...tes.org, peterx@...hat.com,
        baolu.lu@...ux.intel.com
Subject: Re: [PATCH v4 04/12] vfio_pci: make common functions be extern

On Tue,  7 Jan 2020 20:01:41 +0800
Liu Yi L <yi.l.liu@...el.com> wrote:

> This patch makes the common functions (module agnostic functions) in
> vfio_pci.c to be extern. So that such functions could be moved to a
> common source file.
> 
> *) vfio_pci_set_vga_decode
> *) vfio_pci_probe_power_state
> *) vfio_pci_set_power_state
> *) vfio_pci_enable
> *) vfio_pci_disable
> *) vfio_pci_refresh_config
> *) vfio_pci_register_dev_region
> *) vfio_pci_ioctl
> *) vfio_pci_read
> *) vfio_pci_write
> *) vfio_pci_mmap
> *) vfio_pci_request
> *) vfio_pci_err_handlers
> *) vfio_pci_reflck_attach
> *) vfio_pci_reflck_put
> *) vfio_pci_fill_ids

I find it a bit hard to understand what "module agnostic functions" are
supposed to be. The functions you want to move seem to be some "basic"
functions that can be shared between normal vfio-pci and
vfio-mdev-pci... maybe talk about "functions that provide basic vfio
functionality for pci devices" and also mention the mdev part?

[My rationale behind complaining about the commit messages is that if I
look at this change in a year from now, I want to be able to know why
and to what end that change was made.]

> 
> Cc: Kevin Tian <kevin.tian@...el.com>
> Cc: Lu Baolu <baolu.lu@...ux.intel.com>
> Signed-off-by: Liu Yi L <yi.l.liu@...el.com>
> ---
>  drivers/vfio/pci/vfio_pci.c         | 30 +++++++++++++-----------------
>  drivers/vfio/pci/vfio_pci_private.h | 15 +++++++++++++++
>  2 files changed, 28 insertions(+), 17 deletions(-)