On Tue, Feb 21, 2017 at 4:08 PM, Christian König <deathsimple@xxxxxxxxxxx> wrote: > Am 21.02.2017 um 15:55 schrieb Marek Szyprowski: >> >> Dear All, >> >> On 2017-02-21 15:37, Marek Szyprowski wrote: >>> >>> Hi Christian, >>> >>> On 2017-02-21 14:59, Christian König wrote: >>>> >>>> Am 21.02.2017 um 14:21 schrieb Marek Szyprowski: >>>>> >>>>> Add compat ioctl support to dma-buf. This lets one to use >>>>> DMA_BUF_IOCTL_SYNC >>>>> ioctl from 32bit application on 64bit kernel. Data structures for both >>>>> 32 >>>>> and 64bit modes are same, so there is no need for additional >>>>> translation >>>>> layer. >>>> >>>> >>>> Well I might be wrong, but IIRC compat_ioctl was just optional and if >>>> not specified unlocked_ioctl was called instead. >>>> >>>> If that is true your patch wouldn't have any effect at all. >>> >>> >>> Well, then why I got -ENOTTY in the 32bit test app for this ioctl on >>> 64bit ARM64 kernel without this patch? >>> >> >> I've checked in fs/compat_ioctl.c, I see no fallback in >> COMPAT_SYSCALL_DEFINE3, >> so one has to provide compat_ioctl callback to have ioctl working with >> 32bit >> apps. > > > Then my memory cheated on me. > > In this case the patch is Reviewed-by: Christian König > <christian.koenig@xxxxxxx>. Since you have commit rights for drm-misc, care to push this to drm-misc-next-fixes pls? Also I think this warrants a cc: stable, clearly an obvious screw-up in creating this api on our side :( So feel free to smash my ack on the patch. Thanks, Daniel -- Daniel Vetter Software Engineer, Intel Corporation +41 (0) 79 365 57 48 - http://blog.ffwll.ch _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
