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

[Chen-Yu Tsai <wenst@chromium.org>]

On Wed, May 27, 2026 at 9:45 PM Arnd Bergmann <arnd@kernel.org> wrote:
>
> From: Arnd Bergmann <arnd@arndb.de>
>
> 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@arndb.de>

I posted the same patch [1] one and a half months ago when the culprit
patch was queued up and I got a report about this from the bots.

Inki hasn't picked up my fix yet.

And it seems the exynos-drm-next stuff was only merged into drm-next
yesterday, now causing the warnings to pop up all over.

ChenYu

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

> ---
>  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);
>
>         dma_free_attrs(drm_dev_dma_dev(dev), exynos_gem->base.size, exynos_gem->cookie,
>                         (dma_addr_t)exynos_gem->dma_addr,
> --
> 2.39.5
>