linux-kernel - Re: [PATCH v2 3/4] lib/rhashtable: Replace kernel.h with the necessary inclusions

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Date:   Thu, 7 Oct 2021 19:23:28 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Randy Dunlap <rdunlap@...radead.org>,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        kunit-dev@...glegroups.com, linux-media@...r.kernel.org,
        netdev@...r.kernel.org,
        Brendan Higgins <brendanhiggins@...gle.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Ingo Molnar <mingo@...hat.com>, Will Deacon <will@...nel.org>,
        Waiman Long <longman@...hat.com>,
        Boqun Feng <boqun.feng@...il.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Thomas Graf <tgraf@...g.ch>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v2 3/4] lib/rhashtable: Replace kernel.h with the
 necessary inclusions

On Thu, Oct 07, 2021 at 12:51:28PM +0300, Andy Shevchenko wrote:
> When kernel.h is used in the headers it adds a lot into dependency hell,
> especially when there are circular dependencies are involved.
> 
> Replace kernel.h inclusion with the list of what is really being used.
> 
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> ---
>  lib/rhashtable.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/lib/rhashtable.c b/lib/rhashtable.c
> index a422c7dd9126..01502cf77564 100644
> --- a/lib/rhashtable.c
> +++ b/lib/rhashtable.c
> @@ -12,9 +12,13 @@
>   */
>  
>  #include <linux/atomic.h>
> +#include <linux/bit_spinlock.h>
>  #include <linux/container_of.h>
> -#include <linux/kernel.h>
> +#include <linux/err.h>
> +#include <linux/export.h>
>  #include <linux/init.h>
> +#include <linux/jhash.h>
> +#include <linux/lockdep.h>
>  #include <linux/log2.h>
>  #include <linux/sched.h>
>  #include <linux/rculist.h>

Nack.  I can see the benefits of splitting things out of kernel.h
but there is no reason to add crap to end users like rhashtable.c.

Thanks,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt