On Sat, Aug 20, 2016 at 2:20 PM, Emil Velikov <emil.l.velikov@xxxxxxxxx> wrote: > On 20 August 2016 at 12:47, Marek Olšák <maraeo@xxxxxxxxx> wrote: >> On Sat, Aug 20, 2016 at 1:08 PM, Emil Velikov <emil.l.velikov@xxxxxxxxx> wrote: >>> On 20 August 2016 at 11:05, Marek Olšák <maraeo@xxxxxxxxx> wrote: >>>> On Sat, Aug 20, 2016 at 12:54 AM, Emil Velikov <emil.l.velikov@xxxxxxxxx> wrote: >>>>> On 19 August 2016 at 15:26, Christian König <deathsimple@xxxxxxxxxxx> wrote: >>>>>> Am 19.08.2016 um 15:50 schrieb Marek Olšák: >>>>>>> >>>>>>> From: Marek Olšák <marek.olsak@xxxxxxx> >>>>>>> >>>>>>> This reverts commit 2ce9dde0d47f2f94ab25c73a30596a7328bcdf1f. >>>>>>> >>>>>>> See the comment in the code. Basically, don't do cleanups in this header. >>>>>>> >>>>>>> Signed-off-by: Marek Olšák <marek.olsak@xxxxxxx> >>>>>> >>>>>> >>>>>> I completely agree with you that this was a bad move, but I fear that we >>>>>> will run into opposition with that. >>>>>> >>>>> Please check the facts before introducing RATHER ANNOYING AND HARD TO >>>>> READ COMMENT IN ALL CAPS. >>>>> >>>>> Story time: >>>>> I was dreaming of a day were we can stop installing these headers, >>>>> thus making deprecation a bit easier process. >>>>> Yet after failing to convince Dave and Daniel on a number of occasions >>>>> I've accepted that those headers _are_ here to stay. And yes they >>>>> _are_ the UAPI, even though no applications are meant to use them but >>>>> the libdrm 'version'. >>>>> Thus any changes to the libdrm ones should be a mirror of the ones >>>>> here and libdrm should _not_ differ. >>>>> >>>>> But let's ignore all that and imagine that those headers are _not_ >>>>> UAPI. That gives us even greater reason to _not_ use the uintx_t types >>>>> but the kernel __uX ones. The series that did these changes had a fair >>>>> few references why we want that. >>>>> >>>>> Yes, I can imagine that the situation isn't ideal, and/or not that >>>>> clear. Then again a check with git log should have straightened things >>>>> out. >>>>> If not _please_ help us improve this (documentation and/or others). >>>>> >>>>> >>>>> And last but not least, please share with up what inspired this - >>>>> (build/runtime) regression, attempted sync with libdrm, other ? >>>> >>>> Syncing with libdrm became difficult. >>> Actually it should be easier now. Perhaps the radeon one was always a >>> good citizen, but sadly that was not the case for the rest. >>> >>>> I'd like the diff between kernel >>>> and libdrm to be as small as possible. >>>> >>> I believe we all agree on this one :-) >>> >>>> We must take into account that the uapi headers can potentially be >>>> implemented by a different OS. >>> Agreed. Have you looked at the 'compatibility layer' in drm.h ? >>> >>>> That's why they are in libdrm and >>>> that's why nobody should make random changes to them in the kernel >>>> tree. Do not think like a kernel developer isolated in Linux and just >>>> consider the broader use case. If you do, you'll realize that it >>>> simply doesn't make sense to use the __uX types here. >>>> >>> Ftr, like Rob (and maybe others) I believe that using __uX (in the >>> kernel) is a bit odd, and opting for the stdint.h types should happen. >>> But until/if that happens we have to live with the __uX ones. >>> >>> That said, I have poked various BSD people on a number of occasions, >>> (hopefully) inspiring them to upstream their changes in a compatible >>> way. Thus the whole "don't think like a kernel developer" doesn't >>> really apply here :-\ >>> >>> I'm simply one of the few fools^wpeople trying to make things OK for >>> most (since one can never please everyone, all the time). >>> >>> IIRC the FreeBSD/DragonFly people had some issues with their >>> compatibility layer since the kernel and userspace drm.h were >>> divergent "by design" [1]. To make it even 'better' there's even two >>> difference versions of drm.h in their kernel itself [2]. >>> >>> What I am for is a discussion how to resolve things. Although expect >>> resistance if you're thinking about applying tape, in order to fix >>> somethings that's 'broken' elsewhere. >>> >>> If you or any !Linux folks are around on XDC we should really sit down >>> and untangle some/all of these issues. >> >> It's not 100% certain but it looks like we won't be there. >> >> We need the uapi headers to be the same as libdrm ones to make syncing >> easier. There is not much else to discuss here really. We (AMD) are >> also the ones who have to work with these headers the most, not you, not Mikko. >> > Agreed and agreed. > >> While I understand some people want to discuss this further, these >> patches must land first in order bring back the compatibility with >> libdrm. > This is where the misunderstanding lies - there _must_ _not_ be > compatible with the libdrm ones, but the other way around. Check the > output of $ git log -p -- include/drm in libdrm. Pretty please ? > >> After that, we can discuss the possible solutions and >> everybody interested in a better solution *that will take libdrm into >> account* can join. For now, I have to expect that those discussions >> might also lead nowhere and > >> I don't wanna be stuck with bad uapi >> headers in the kernel forever. >> > As mentioned before - please clearly state what do you perceive as bad > and/or why. Daniel, myself and Rob (to a point) have explained that > things are not perfect as-is but they are definitely not bad or wrong. The problem is the diff is different, which has been said many times. Marek _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
