linux-kernel - Re: [PATCH v8 04/20] dlb: add device ioctl layer and first three ioctls

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Date:   Thu, 7 Jan 2021 20:41:01 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Mike Ximing Chen <mike.ximing.chen@...el.com>
Cc:     linux-kernel@...r.kernel.org, arnd@...db.de,
        dan.j.williams@...el.com, pierre-louis.bossart@...ux.intel.com,
        Gage Eads <gage.eads@...el.com>
Subject: Re: [PATCH v8 04/20] dlb: add device ioctl layer and first three
 ioctls

On Mon, Jan 04, 2021 at 08:58:23PM -0600, Mike Ximing Chen wrote:
> Introduce the dlb device ioctl layer and the first three ioctls: query
> device version, query available resources, and create a scheduling domain.
> Also introduce the user-space interface file dlb_user.h.
> 
> The device version query is designed to allow each DLB device version/type
> to have its own unique ioctl API through the /dev/dlb%d node. Each such API
> would share in common the device version command as its first command, and
> all subsequent commands can be unique to the particular device.
> 
> The hardware operation for scheduling domain creation will be added in a
> subsequent commit.
> 
> Signed-off-by: Gage Eads <gage.eads@...el.com>
> Signed-off-by: Mike Ximing Chen <mike.ximing.chen@...el.com>
> Reviewed-by: Magnus Karlsson <magnus.karlsson@...el.com>
> Reviewed-by: Dan Williams <dan.j.williams@...el.com>
> ---
>  .../userspace-api/ioctl/ioctl-number.rst      |   1 +
>  drivers/misc/dlb/Makefile                     |   2 +-
>  drivers/misc/dlb/dlb_bitmap.h                 |  32 ++++
>  drivers/misc/dlb/dlb_ioctl.c                  | 119 +++++++++++++
>  drivers/misc/dlb/dlb_ioctl.h                  |  11 ++
>  drivers/misc/dlb/dlb_main.c                   |   3 +
>  drivers/misc/dlb/dlb_main.h                   |   7 +
>  drivers/misc/dlb/dlb_pf_ops.c                 |  21 +++
>  drivers/misc/dlb/dlb_resource.c               |  63 +++++++
>  drivers/misc/dlb/dlb_resource.h               |   5 +
>  include/uapi/linux/dlb.h                      | 166 ++++++++++++++++++
>  11 files changed, 429 insertions(+), 1 deletion(-)
>  create mode 100644 drivers/misc/dlb/dlb_ioctl.c
>  create mode 100644 drivers/misc/dlb/dlb_ioctl.h
>  create mode 100644 include/uapi/linux/dlb.h
> 
> diff --git a/Documentation/userspace-api/ioctl/ioctl-number.rst b/Documentation/userspace-api/ioctl/ioctl-number.rst
> index 55a2d9b2ce33..afca043d59f8 100644
> --- a/Documentation/userspace-api/ioctl/ioctl-number.rst
> +++ b/Documentation/userspace-api/ioctl/ioctl-number.rst
> @@ -241,6 +241,7 @@ Code  Seq#    Include File                                           Comments
>  'h'   00-7F                                                          conflict! Charon filesystem
>                                                                       <mailto:zapman@...erlan.net>
>  'h'   00-1F  linux/hpet.h                                            conflict!
> +'h'   00-1F  uapi/linux/dlb.h                                        conflict!

Why are you taking a range that you know there is a conflict for?