On Tue, 2016-03-29 at 13:12 +0200, Daniel Vetter wrote:
> This reverts commit e91abf80a0998f326107874c88d549f94839f13c.
>
> Since
>
> commit 24e4a8c3e8868874835b0f1ad6dd417341e99822
> Author: John Stultz <john.stultz@xxxxxxxxxx>
> Date: Wed Jul 16 21:03:53 2014 +0000
>
> ktime: Kill non-scalar ktime_t implementation for 2038
>
> there is no longer a 32bit version that's unsigned, and we don't have
> to jump through ridiculous hoops to make the calculations correct.
>
> I didn't look whether there's more of this pattern in the kernel.
>
> Cc: John Stultz <john.stultz@xxxxxxxxxx>
> Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
> Cc: Michel Dänzer <michel.daenzer@xxxxxxx>
> Cc: Imre Deak <imre.deak@xxxxxxxxx>
> Cc: Dave Airlie <airlied@xxxxxxxxxx>
> Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxxx>
Reviewed-by: Imre Deak <imre.deak@xxxxxxxxx>
> ---
> drivers/gpu/drm/drm_irq.c | 5 +----
> 1 file changed, 1 insertion(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
> index f77653562fac..4d06cf41df96 100644
> --- a/drivers/gpu/drm/drm_irq.c
> +++ b/drivers/gpu/drm/drm_irq.c
> @@ -863,10 +863,7 @@ int drm_calc_vbltimestamp_from_scanoutpos(struct
> drm_device *dev,
> /* Subtract time delta from raw timestamp to get final
> * vblank_time timestamp for end of vblank.
> */
> - if (delta_ns < 0)
> - etime = ktime_add_ns(etime, -delta_ns);
> - else
> - etime = ktime_sub_ns(etime, delta_ns);
> + etime = ktime_sub_ns(etime, delta_ns);
> *vblank_time = ktime_to_timeval(etime);
>
> DRM_DEBUG_VBL("crtc %u : v 0x%x p(%d,%d)@ %ld.%ld -> %ld.%ld
> [e %d us, %d rep]\n",b
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