linux-kernel - Re: [PATCH] linux headers: include linux/types.h where appropriate

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Date:	Thu, 23 Feb 2012 16:27:39 -0500
From:	Bobby Powers <bobbypowers@...il.com>
To:	Sam Ravnborg <sam@...nborg.org>
Cc:	Dave Airlie <airlied@...ux.ie>, linux-kernel@...r.kernel.org,
	tglx@...utronix.de, davem@...emloft.net
Subject: Re: [PATCH] linux headers: include linux/types.h where appropriate

On Thu, Feb 23, 2012 at 2:50 PM, Sam Ravnborg <sam@...nborg.org> wrote:
> On Thu, Feb 23, 2012 at 07:28:10PM +0000, Dave Airlie wrote:
>>
>> > This silences the related header check warnings.
>>
>> please fix the bug in the correct place, the drm.h header includes
>> linux/types.h and this is one on purpose.
>>
>> maybe expend some effort fixing the stupid tool to recurse like a normal
>> preprocessor would.
>
> Before we fix the tool maybe we should agree on what the tool should check for.
> One obvious thing to check is that we do not start to use user-land
> types in our exported headers like uint32_t etc.
> Another could be that no header file should depend oon the user to include other
> header files.
> Etc.

I just sent out a patch that recursively checks for including types.h,
as it was quite simple.  Additional checks seem like they may be a
good idea, but not something that has to be decided right here.

> The checks we have implmented today are very conservative - but as you resist
> to add a few includes in the drm/drm*.h files prevents us from hitting
> zero warnings even with these conservative checks.
>
> If we started to be more strict we would see much more warnings/errors.
> But all this fuzz about a handfull of includes in the drm header files
> sure scare me away from ever starting this.
> I can only image the uproar some other changes may cause then.

Interestingly, with headers_check searching for types.h recursively
(clearing up some noise), include/drm/drm_mode.h stands out as still
needing to include <linux/types.h>, as it doesn't import drm.h.

>
>        Sam
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