linux-kernel - Re: [PATCH v3 02/19] vdpa_sim: remove unnecessary headers inclusion

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Message-ID: <7e55ab39-afdd-f47b-55ec-a2bec4ab4cec@infradead.org>
Date:   Thu, 3 Dec 2020 09:37:48 -0800
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Stefano Garzarella <sgarzare@...hat.com>,
        virtualization@...ts.linux-foundation.org
Cc:     Stefan Hajnoczi <stefanha@...hat.com>,
        "Michael S. Tsirkin" <mst@...hat.com>, Oren Duer <oren@...dia.com>,
        Jason Wang <jasowang@...hat.com>,
        Laurent Vivier <lvivier@...hat.com>,
        linux-kernel@...r.kernel.org, Max Gurtovoy <mgurtovoy@...dia.com>,
        Shahaf Shuler <shahafs@...dia.com>, Eli Cohen <elic@...dia.com>
Subject: Re: [PATCH v3 02/19] vdpa_sim: remove unnecessary headers inclusion

On 12/3/20 9:04 AM, Stefano Garzarella wrote:
> Some headers are not necessary, so let's remove them to do
> some cleaning.
> 
> Signed-off-by: Stefano Garzarella <sgarzare@...hat.com>

Hi,
What makes you say that some of these are unnecessary?

Please use Rule #1 from Documentation/process/submit-checklist.rst:

1) If you use a facility then #include the file that defines/declares
   that facility.  Don't depend on other header files pulling in ones
   that you use.


so just because it will compile without these headers being explictly
#included does not mean that you should remove them.


> ---
> v3:
> - avoided to remove some headers with structures and functions directly
>   used (device.h, slab.h, virtio_byteorder.h)[Jason]
> ---
>  drivers/vdpa/vdpa_sim/vdpa_sim.c | 10 ----------
>  1 file changed, 10 deletions(-)
> 
> diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim.c b/drivers/vdpa/vdpa_sim/vdpa_sim.c
> index 6a90fdb9cbfc..b08f28d20d8d 100644
> --- a/drivers/vdpa/vdpa_sim/vdpa_sim.c
> +++ b/drivers/vdpa/vdpa_sim/vdpa_sim.c
> @@ -7,20 +7,10 @@
>   *
>   */
>  
> -#include <linux/init.h>

above is used by __init and __exit.

>  #include <linux/module.h>
>  #include <linux/device.h>
> -#include <linux/kernel.h>
> -#include <linux/fs.h>
> -#include <linux/poll.h>

Looks OK to remove poll.h.

>  #include <linux/slab.h>
> -#include <linux/sched.h>

Might be OK for sched.h.

> -#include <linux/wait.h>

Might be OK for wait.h.

> -#include <linux/uuid.h>
> -#include <linux/iommu.h>
>  #include <linux/dma-map-ops.h>
> -#include <linux/sysfs.h>
> -#include <linux/file.h>
>  #include <linux/etherdevice.h>
>  #include <linux/vringh.h>
>  #include <linux/vdpa.h>
> 

I didn't check the others.


-- 
~Randy