linux-kernel - Re: [PATCH] drm/komeda: fix size

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Date:   Mon, 17 Jun 2019 14:32:13 +0100
From:   Liviu Dudau <liviu.dudau@....com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     "James (Qian) Wang" <james.qian.wang@....com>,
        Brian Starkey <brian.starkey@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        "Lowry Li (Arm Technology China)" <Lowry.Li@....com>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/komeda: fix size_t format string

Hi Arnd,

On Mon, Jun 17, 2019 at 02:49:18PM +0200, Arnd Bergmann wrote:
> The debug output uses the wrong format string for printing a size_t:
> 
> In file included from include/drm/drm_mm.h:49,
>                  from include/drm/drm_vma_manager.h:26,
>                  from include/drm/drm_gem.h:40,
>                  from drivers/gpu/drm/arm/display/komeda/komeda_framebuffer.c:9:
> drivers/gpu/drm/arm/display/komeda/komeda_framebuffer.c: In function 'komeda_fb_afbc_size_check':
> drivers/gpu/drm/arm/display/komeda/komeda_framebuffer.c:96:17: error: format '%lx' expects argument of type 'long unsigned int', but argument 3 has type 'size_t' {aka 'unsigned int'} [-Werror=format=]
>    DRM_DEBUG_KMS("afbc size check failed, obj_size: 0x%lx. min_size 0x%x.\n",
> 
> This is harmless in the kernel as size_t and long are always the same
> width, but it's always better to use the correct format string
> to shut up the warning.
> 
> Fixes: 9ccf536e53cb ("drm/komeda: Added AFBC support for komeda driver")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Thank you for the patch! I did see the warning email sent by the build bots and
I've had the same fix in my stash, but then I've looked at the code using
min_size and I'm not happy with it, so I've asked James to come up with a patch
to fix things in a better way.

So, if you don't mind, I will delay this patch until James comes up with a fix
in the next couple of days. If he is not, then I'll pull the patch into mali-dp
tree (shared with komeda).

Best regards,
Liviu


> ---
>  drivers/gpu/drm/arm/display/komeda/komeda_framebuffer.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_framebuffer.c b/drivers/gpu/drm/arm/display/komeda/komeda_framebuffer.c
> index abc8c0ccc053..58ff34e718d0 100644
> --- a/drivers/gpu/drm/arm/display/komeda/komeda_framebuffer.c
> +++ b/drivers/gpu/drm/arm/display/komeda/komeda_framebuffer.c
> @@ -93,7 +93,7 @@ komeda_fb_afbc_size_check(struct komeda_fb *kfb, struct drm_file *file,
>  			       AFBC_SUPERBLK_ALIGNMENT);
>  	min_size = kfb->afbc_size + fb->offsets[0];
>  	if (min_size > obj->size) {
> -		DRM_DEBUG_KMS("afbc size check failed, obj_size: 0x%lx. min_size 0x%x.\n",
> +		DRM_DEBUG_KMS("afbc size check failed, obj_size: 0x%zx. min_size 0x%x.\n",
>  			      obj->size, min_size);
>  		goto check_failed;
>  	}
> @@ -137,7 +137,7 @@ komeda_fb_none_afbc_size_check(struct komeda_dev *mdev, struct komeda_fb *kfb,
>  		min_size = komeda_fb_get_pixel_addr(kfb, 0, fb->height, i)
>  			 - to_drm_gem_cma_obj(obj)->paddr;
>  		if (obj->size < min_size) {
> -			DRM_DEBUG_KMS("The fb->obj[%d] size: %ld lower than the minimum requirement: %d.\n",
> +			DRM_DEBUG_KMS("The fb->obj[%d] size: %zd lower than the minimum requirement: %d.\n",
>  				      i, obj->size, min_size);
>  			return -EINVAL;
>  		}
> -- 
> 2.20.0
> 

-- 
====================
| I would like to |
| fix the world,  |
| but they're not |
| giving me the   |
 \ source code!  /
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