linux-kernel - Re: drivers/gpu/drm/qxl/qxl_cmd.c:424:6: error: variable 'count' set but not used

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Message-ID: <20240327-magnetic-nonchalant-hare-bbe8d2@houat>
Date: Wed, 27 Mar 2024 08:59:02 +0100
From: Maxime Ripard <mripard@...nel.org>
To: Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
Cc: Dave Airlie <airlied@...hat.com>, Gerd Hoffmann <kraxel@...hat.com>, 
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, Thomas Zimmermann <tzimmermann@...e.de>, 
	David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>, virtualization@...ts.linux.dev, 
	spice-devel@...ts.freedesktop.org, dri-devel <dri-devel@...ts.freedesktop.org>, 
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: drivers/gpu/drm/qxl/qxl_cmd.c:424:6: error: variable 'count' set
 but not used

Hi Miguel,

On Tue, Mar 26, 2024 at 07:04:34PM +0100, Miguel Ojeda wrote:
> Hi,
> 
> In today's next, I got:
> 
>     drivers/gpu/drm/qxl/qxl_cmd.c:424:6: error: variable 'count' set
> but not used [-Werror,-Wunused-but-set-variable]
> 
> `count` seems to be there since commit f64122c1f6ad ("drm: add new QXL
> driver. (v1.4)").
> 
> Untested diff below -- if you want a formal patch, please let me know.
> 
> Cheers,
> Miguel
> 
> diff --git a/drivers/gpu/drm/qxl/qxl_cmd.c b/drivers/gpu/drm/qxl/qxl_cmd.c
> index 281edab518cd..d6ea01f3797b 100644
> --- a/drivers/gpu/drm/qxl/qxl_cmd.c
> +++ b/drivers/gpu/drm/qxl/qxl_cmd.c
> @@ -421,7 +421,6 @@ int qxl_surface_id_alloc(struct qxl_device *qdev,
>  {
>         uint32_t handle;
>         int idr_ret;
> -       int count = 0;
>  again:
>         idr_preload(GFP_ATOMIC);
>         spin_lock(&qdev->surf_id_idr_lock);
> @@ -433,7 +432,6 @@ int qxl_surface_id_alloc(struct qxl_device *qdev,
>         handle = idr_ret;
> 
>         if (handle >= qdev->rom->n_surfaces) {
> -               count++;
>                 spin_lock(&qdev->surf_id_idr_lock);
>                 idr_remove(&qdev->surf_id_idr, handle);
>                 spin_unlock(&qdev->surf_id_idr_lock);
> 

It looks reasonable to me, can you send a formal patch?

Thanks!
Maxime

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