linux-kernel - Re: [PATCH 05/45] drm.h: include stdlib.h in userspace

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Date:	Thu, 9 Apr 2015 17:00:48 +0100
From:	Emil Velikov <emil.l.velikov@...il.com>
To:	Mikko Rapeli <mikko.rapeli@....fi>
Cc:	David Howells <dhowells@...hat.com>,
	Daniel Vetter <daniel@...ll.ch>,
	Dave Airlie <airlied@...il.com>,
	"Linux-Kernel@...r. Kernel. Org" <linux-kernel@...r.kernel.org>,
	ML dri-devel <dri-devel@...ts.freedesktop.org>,
	linux-api@...r.kernel.org
Subject: Re: [PATCH 05/45] drm.h: include stdlib.h in userspace

Hi Mikko

Pardon for the late response,

On 21 March 2015 at 12:17, Mikko Rapeli <mikko.rapeli@....fi> wrote:
> On Fri, Mar 20, 2015 at 08:25:40PM +0000, Emil Velikov wrote:
>> On 23 February 2015 at 10:35, Mikko Rapeli <mikko.rapeli@....fi> wrote:
>> > On Mon, Feb 23, 2015 at 10:26:58AM +0000, Emil Velikov wrote:
>> >> On 16/02/15 23:05, Mikko Rapeli wrote:
>> >> > Fixes <drm/drm.h> compilation error:
>> >> >
>> >> > drm/drm.h:132:2: error: unknown type name ‘size_t’
>> >> >
>> >> Hi Mikko,
>> >>
>> >> Can you let us know how you're getting these (series-wise) errors ? I've
>> >> been meaning to sync the uapi/drm and libdrm headers and would be nice
>> >> to have an extra step to test things.
>> >
>> > This should have everything needed to reproduce these compile errors,
>> > though some of the errors hide behind other errors and fixes:
>> >
>> > https://lkml.org/lkml/2015/2/16/525
>> >
>> Thanks for the link Mikko.
>>
>> Afaict the general consensus seems to be that one should avoid using
>> stdint's uint8_t, but stick to __u8 and friends. Did you had the
>> chance to roll out another series that does so ?
>
> Yes, new series with these changes is on the way. I'm trying to follow up to
> all other review comments as well and get down to 100% compiling uapi
> headers; 35 failures to go...
>
Glad to hear that it's getting there. Might be a bit slower than
expected but we'll get there :-) Can you please Cc me on the next
iteration ?

>> That aside I'm not 100% sure that doing the UAPI split, as is, was the
>> perfect solution. Afaik drm used to live as an out of tree userspace
>> library(libdrm). Not sure at which point the major restructuring took
>> part, but one is certain - libdrm remains the only authoritative
>> sources of the headers. It's possible that some buggy programs pull
>> the UAPI headers while linking against the library, but I'd say that
>> won't end up well in the long term. Additionally since the UAPI split
>> the `make update-headers' target used to sync libdrm's headers have
>> been broken leading people to copy misc. hunks and/or files. Leading
>> to greater chance of things going sour.
>>
>> All that said, I will need to gather some opinions for drm developers
>> and maintainers if the idea of part revering 718dcedd7e8(UAPI:
>> (Scripted) Disintegrate include/drm) will be the way forward.
>
> Ok, I'll follow what is available in Linus' tree (or -next, not shure which
> one I should track for these changes).
>
After discussing (more like annoying) our DRM maintainer we got to the
conclusion that the headers will stay exposed to userspace. So any and
all of your work will be greatly appreciated.

Thanks
Emil
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