[PATCH] drm/panthor: fix building without CONFIG_DEBUG_FS

[Adrián Larumbe]

Hi Arnd,

Thanks for the fix. I've already submitted a second attempt because I thought the build being broken
is something we ought to deal with ASAP. I've added you as a bug reporter and also made mention
of this thread in the new patch.

Kind Regards,
Adrian

On 24.04.2025 13:25, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd at arndb.de>
>
> When debugfs is disabled, including panthor_gem.h causes warnings
> about a non-static global function defined in a header:
>
> In file included from drivers/gpu/drm/panthor/panthor_drv.c:30:
> drivers/gpu/drm/panthor/panthor_gem.h:222:6: error: no previous prototype for 'panthor_gem_debugfs_set_usage_flags' [-Werror=missing-prototypes]
>   222 | void panthor_gem_debugfs_set_usage_flags(struct panthor_gem_object *bo, u32 usage_flags) {};
>
> This could be changed to a static inline function, but as the normal
> one is also static inline, just move the #ifdef check in there.
> The #ifdef is still needed to avoid accessing a struct member that
> does not exist without debugfs.
>
> Fixes: a3707f53eb3f ("drm/panthor: show device-wide list of DRM GEM objects over DebugFS")
> Signed-off-by: Arnd Bergmann <arnd at arndb.de>
> ---
>  drivers/gpu/drm/panthor/panthor_gem.h | 7 ++-----
>  1 file changed, 2 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/gpu/drm/panthor/panthor_gem.h b/drivers/gpu/drm/panthor/panthor_gem.h
> index 4641994ddd7f..693842e10dee 100644
> --- a/drivers/gpu/drm/panthor/panthor_gem.h
> +++ b/drivers/gpu/drm/panthor/panthor_gem.h
> @@ -209,17 +209,14 @@ panthor_kernel_bo_create(struct panthor_device *ptdev, struct panthor_vm *vm,
>
>  void panthor_kernel_bo_destroy(struct panthor_kernel_bo *bo);
>
> -#ifdef CONFIG_DEBUG_FS
>  void panthor_gem_debugfs_print_bos(struct panthor_device *pfdev,
>  				   struct seq_file *m);
>  static inline void
>  panthor_gem_debugfs_set_usage_flags(struct panthor_gem_object *bo, u32 usage_flags)
>  {
> +#ifdef CONFIG_DEBUG_FS
>  	bo->debugfs.flags = usage_flags | PANTHOR_DEBUGFS_GEM_USAGE_FLAG_INITIALIZED;
> -}
> -
> -#else
> -void panthor_gem_debugfs_set_usage_flags(struct panthor_gem_object *bo, u32 usage_flags) {};
>  #endif
> +}
>
>  #endif /* __PANTHOR_GEM_H__ */
> --
> 2.39.5