Re: [PATCH] drm/exynos: fix size_t format string

[Uwe Kleine-König]

Hello,

On Wed, May 27, 2026 at 09:45:07PM +0200, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@xxxxxxxx>
> 
> The exynos_gem->base.size argument is a size_t rather than an
> unsigned long, so adapt the printk() format string accordingly:
> 
> In file included from drivers/gpu/drm/exynos/exynos_drm_gem.c:16:
> drivers/gpu/drm/exynos/exynos_drm_gem.c: In function 'exynos_drm_alloc_buf':
> drivers/gpu/drm/exynos/exynos_drm_gem.c:69:49: error: format '%lx' expects argument of type 'long unsigned int', but argument 6 has type 'size_t' {aka 'unsigned int'} [-Werror=format=]
>    69 |         DRM_DEV_DEBUG_KMS(drm_dev_dma_dev(dev), "dma_addr(0x%lx), size(0x%lx)\n",
>       |                                                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>    70 |                         (unsigned long)exynos_gem->dma_addr, exynos_gem->base.size);
>       |                                                              ~~~~~~~~~~~~~~~~~~~~~
>       |                                                                              |
>       |                                                                              size_t {aka unsigned int}
> 
> The dma_addr in the same line is already printed using a cast
> to unsigned long, so change that similarly to use the correct
> %pad format.
> 
> Fixes: 11e898373fba ("drm/exynos: Drop exynos_drm_gem.size field")
> Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
> ---
>  drivers/gpu/drm/exynos/exynos_drm_gem.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/gpu/drm/exynos/exynos_drm_gem.c b/drivers/gpu/drm/exynos/exynos_drm_gem.c
> index 297a93b087cd..8e357f2beb9e 100644
> --- a/drivers/gpu/drm/exynos/exynos_drm_gem.c
> +++ b/drivers/gpu/drm/exynos/exynos_drm_gem.c
> @@ -66,8 +66,8 @@ static int exynos_drm_alloc_buf(struct exynos_drm_gem *exynos_gem, bool kvmap)
>  	if (kvmap)
>  		exynos_gem->kvaddr = exynos_gem->cookie;
>  
> -	DRM_DEV_DEBUG_KMS(drm_dev_dma_dev(dev), "dma_addr(0x%lx), size(0x%lx)\n",
> -			(unsigned long)exynos_gem->dma_addr, exynos_gem->base.size);
> +	DRM_DEV_DEBUG_KMS(drm_dev_dma_dev(dev), "dma_addr(%pad), size(0x%zx)\n",
> +			  &exynos_gem->dma_addr, exynos_gem->base.size);
>  	return 0;
>  }
>  
> @@ -80,8 +80,8 @@ static void exynos_drm_free_buf(struct exynos_drm_gem *exynos_gem)
>  		return;
>  	}
>  
> -	DRM_DEV_DEBUG_KMS(dev->dev, "dma_addr(0x%lx), size(0x%lx)\n",
> -			(unsigned long)exynos_gem->dma_addr, exynos_gem->base.size);
> +	DRM_DEV_DEBUG_KMS(dev->dev, "dma_addr(0x%pad), size(0x%zx)\n",
> +			  &exynos_gem->dma_addr, exynos_gem->base.size);

Inconsistent formatting. The first hunk used dma_addr(%pad), the second
adds "0x". Chen-Yu Tsai's patch[1] was better in that regard.

Best regards
Uwe

[1] https://lore.kernel.org/all/20260408064936.1342321-1-wenst@xxxxxxxxxxxx/

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