linux-kernel - Re: [PATCH] drm/vgm: replace idr_init() by idr_init

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Message-ID: <20201105094215.GT401619@phenom.ffwll.local>
Date:   Thu, 5 Nov 2020 10:42:15 +0100
From:   Daniel Vetter <daniel@...ll.ch>
To:     Deepak R Varma <mh12gx2825@...il.com>
Cc:     David Airlie <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/vgm: replace idr_init() by idr_init_base()

On Wed, Nov 04, 2020 at 04:53:38PM +0530, Deepak R Varma wrote:
> idr_init() uses base 0 which is an invalid identifier. The new function
> idr_init_base allows IDR to set the ID lookup from base 1. This avoids
> all lookups that otherwise starts from 0 since 0 is always unused.
> 
> References: commit 6ce711f27500 ("idr: Make 1-based IDRs more efficient")
> 
> Signed-off-by: Deepak R Varma <mh12gx2825@...il.com>

Tiny typo in the commit message summary: s/vgm/vgem/

Also can you pls resbumit this with intel-gfx mailing list on cc (like for
i915)? There's a CI bot there which runs a few vgem tests, would be good
to confirm nothing has been broken.

Otherwise lgtm.

Thanks, Daniel

> ---
>  drivers/gpu/drm/vgem/vgem_fence.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/vgem/vgem_fence.c b/drivers/gpu/drm/vgem/vgem_fence.c
> index 17f32f550dd9..2902dc6e64fa 100644
> --- a/drivers/gpu/drm/vgem/vgem_fence.c
> +++ b/drivers/gpu/drm/vgem/vgem_fence.c
> @@ -233,7 +233,7 @@ int vgem_fence_signal_ioctl(struct drm_device *dev,
>  int vgem_fence_open(struct vgem_file *vfile)
>  {
>  	mutex_init(&vfile->fence_mutex);
> -	idr_init(&vfile->fence_idr);
> +	idr_init_base(&vfile->fence_idr, 1);
>  
>  	return 0;
>  }
> -- 
> 2.25.1
> 

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch