linux-kernel - Re: [PATCH] drm/panthor: Fix build warning when DEBUG

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Message-ID: <20250429182207.11a26b68@collabora.com>
Date: Tue, 29 Apr 2025 22:19:43 +0200
From: Boris Brezillon <boris.brezillon@...labora.com>
To: Adrián Larumbe <adrian.larumbe@...labora.com>
Cc: linux-kernel@...r.kernel.org, Arnd Bergmann <arnd@...nel.org>, Arnd
 Bergmann <arnd@...db.de>, Steven Price <steven.price@....com>, Liviu Dudau
 <liviu.dudau@....com>, Maarten Lankhorst
 <maarten.lankhorst@...ux.intel.com>, Maxime Ripard <mripard@...nel.org>,
 Thomas Zimmermann <tzimmermann@...e.de>, David Airlie <airlied@...il.com>,
 Simona Vetter <simona@...ll.ch>, dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH] drm/panthor: Fix build warning when DEBUG_FS is
 disabled

On Thu, 24 Apr 2025 19:40:34 +0100
Adrián Larumbe <adrian.larumbe@...labora.com> wrote:

> Commit a3707f53eb3f ("drm/panthor: show device-wide list of DRM GEM
> objects over DebugFS") causes a build warning and linking error when
> built without support for DebugFS, because of a non-inline non-static
> function declaration in a header file.
> 
> On top of that, the function is only being used inside a single
> compilation unit, so there is no point in exposing it as a global
> symbol.
> 
> This is a follow-up from Arnd Bergmann's first fix.
> Also move panthor_gem_debugfs_set_usage_flags() into panthor_gem.c and
> declare it static.
> 
> Fixes: a3707f53eb3f ("drm/panthor: show device-wide list of DRM GEM objects over DebugFS")
> Reported-by: Arnd Bergmann <arnd@...db.de>
> Closes: https://lore.kernel.org/dri-devel/20250424142419.47b9d457@collabora.com/T/#t
> Signed-off-by: Adrián Larumbe <adrian.larumbe@...labora.com>

Queued to drm-misc-next.

> ---
>  drivers/gpu/drm/panthor/panthor_gem.c | 5 +++++
>  drivers/gpu/drm/panthor/panthor_gem.h | 8 --------
>  2 files changed, 5 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/gpu/drm/panthor/panthor_gem.c b/drivers/gpu/drm/panthor/panthor_gem.c
> index 2dcf308094b2..7c00fd77758b 100644
> --- a/drivers/gpu/drm/panthor/panthor_gem.c
> +++ b/drivers/gpu/drm/panthor/panthor_gem.c
> @@ -42,11 +42,16 @@ static void panthor_gem_debugfs_bo_rm(struct panthor_gem_object *bo)
>  	mutex_unlock(&ptdev->gems.lock);
>  }
>  
> +static void panthor_gem_debugfs_set_usage_flags(struct panthor_gem_object *bo, u32 usage_flags)
> +{
> +	bo->debugfs.flags = usage_flags | PANTHOR_DEBUGFS_GEM_USAGE_FLAG_INITIALIZED;
> +}
>  #else
>  static void panthor_gem_debugfs_bo_add(struct panthor_device *ptdev,
>  				       struct panthor_gem_object *bo)
>  {}
>  static void panthor_gem_debugfs_bo_rm(struct panthor_gem_object *bo) {}
> +static void panthor_gem_debugfs_set_usage_flags(struct panthor_gem_object *bo, u32 usage_flags) {}
>  #endif
>  
>  static void panthor_gem_free_object(struct drm_gem_object *obj)
> diff --git a/drivers/gpu/drm/panthor/panthor_gem.h b/drivers/gpu/drm/panthor/panthor_gem.h
> index 4641994ddd7f..4dd732dcd59f 100644
> --- a/drivers/gpu/drm/panthor/panthor_gem.h
> +++ b/drivers/gpu/drm/panthor/panthor_gem.h
> @@ -212,14 +212,6 @@ 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)
> -{
> -	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__ */
> 
> base-commit: 3a2b7389feea9a7afd18d58cda59b7a989445f38