[PATCH] radeon: Use only a single work queue thread for crt

[Christian König]

Am 03.08.19 um 02:09 schrieb Andi Kleen:
> From: Andi Kleen <ak at linux.intel.com>
>
> I got tired of seeing a lot of radeon-crt kernel threads in ps on my
> workstation, one for each CPU and one for each display, which never use any CPU time.
> Surely a single kernel thread is enough to handle the display.

NAK, radeon blocks inside the kernel thread and those need to run in 
parallel or otherwise the hardware can hang.

Christian.

>
> Signed-off-by: Andi Kleen <ak at linux.intel.com>
> ---
>   drivers/gpu/drm/radeon/radeon_display.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/radeon/radeon_display.c b/drivers/gpu/drm/radeon/radeon_display.c
> index bd52f15e6330..fb0ca688f6fe 100644
> --- a/drivers/gpu/drm/radeon/radeon_display.c
> +++ b/drivers/gpu/drm/radeon/radeon_display.c
> @@ -682,7 +682,7 @@ static void radeon_crtc_init(struct drm_device *dev, int index)
>   
>   	drm_mode_crtc_set_gamma_size(&radeon_crtc->base, 256);
>   	radeon_crtc->crtc_id = index;
> -	radeon_crtc->flip_queue = alloc_workqueue("radeon-crtc", WQ_HIGHPRI, 0);
> +	radeon_crtc->flip_queue = alloc_workqueue("radeon-crtc", WQ_HIGHPRI|WQ_UNBOUND, 0);
>   	rdev->mode_info.crtcs[index] = radeon_crtc;
>   
>   	if (rdev->family >= CHIP_BONAIRE) {