Re: [PATCH -next] net/ipv4/tcp_metrics.c: remove superfluous header files from tcp_metrics.c

[Eric Dumazet]

On Sat, Sep 25, 2021 at 7:27 AM Mianhan Liu <liumh1@xxxxxxxxxxxxxxxxxxx> wrote:
>
> tcp_metrics.c hasn't use any macro or function declared in rcupdate.h
> spinlock.h, module.h, cache.h, hash.h and vmalloc.h. Thus, these files
> can be removed from tcp_metrics.c safely without affecting the compilation
> of the net module.

This seems pretty much relying on other includes.
(eg #include <linux/tcp.h> brings many things already)

We do not generally do this.


>
> Signed-off-by: Mianhan Liu <liumh1@xxxxxxxxxxxxxxxxxxx>
>
> ---
>  net/ipv4/tcp_metrics.c | 6 ------
>  1 file changed, 6 deletions(-)
>
> diff --git a/net/ipv4/tcp_metrics.c b/net/ipv4/tcp_metrics.c
> index 0588b004d..7b819530d 100644
> --- a/net/ipv4/tcp_metrics.c
> +++ b/net/ipv4/tcp_metrics.c
> @@ -1,15 +1,9 @@
>  // SPDX-License-Identifier: GPL-2.0
> -#include <linux/rcupdate.h>

We do use rcu stuff in this file.

> -#include <linux/spinlock.h>

We do use spinlocks in tcp_metrics.c

>  #include <linux/jiffies.h>
> -#include <linux/module.h>
> -#include <linux/cache.h>
>  #include <linux/slab.h>
>  #include <linux/init.h>
>  #include <linux/tcp.h>
> -#include <linux/hash.h>
>  #include <linux/tcp_metrics.h>
> -#include <linux/vmalloc.h>

Not sure why kvzalloc() is not in linux/vmalloc.h

Honestly I do not even know why we spend time trying to reduce list of includes.