From: Rob Clark <robdclark@xxxxxxxxxxxx> If userspace asked for a timeout greater than zero, but less than a jiffy, they clearly weren't planning on spinning. So it is better to round up to one. This fixes an issue with supertuxkart that was (for some reason) spinning on a gl sync with 1ms timeout. CPU time for a demo lap drops from: 15.83user 20.98system 0:47.46elapsed 77%CPU to: 8.84user 2.30system 0:46.67elapsed 23%CPU Signed-off-by: Rob Clark <robdclark@xxxxxxxxxxxx> --- drivers/gpu/drm/msm/msm_drv.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/msm/msm_drv.h b/drivers/gpu/drm/msm/msm_drv.h index 9f0c184b02a0..7936aa6cad03 100644 --- a/drivers/gpu/drm/msm/msm_drv.h +++ b/drivers/gpu/drm/msm/msm_drv.h @@ -548,7 +548,7 @@ static inline unsigned long timeout_to_jiffies(const ktime_t *timeout) remaining_jiffies = ktime_divns(rem, NSEC_PER_SEC / HZ); } - return clamp(remaining_jiffies, 0LL, (s64)INT_MAX); + return clamp(remaining_jiffies, 1LL, (s64)INT_MAX); } /* Driver helpers */ -- 2.39.2
