linux-kernel - Re: [PATCH] drm/ttm: fix unused function warning

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Date:   Tue, 8 Dec 2020 10:18:18 +0200
From:   Martin Peres <martin.peres@...uf.org>
To:     Arnd Bergmann <arnd@...nel.org>,
        Christian Koenig <christian.koenig@....com>,
        Huang Rui <ray.huang@....com>, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Dave Airlie <airlied@...hat.com>,
        Madhav Chauhan <madhav.chauhan@....com>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Alex Deucher <alexander.deucher@....com>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/ttm: fix unused function warning

On 04/12/2020 18:51, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> ttm_pool_type_count() is not used when debugfs is disabled:
> 
> drivers/gpu/drm/ttm/ttm_pool.c:243:21: error: unused function 'ttm_pool_type_count' [-Werror,-Wunused-function]
> static unsigned int ttm_pool_type_count(struct ttm_pool_type *pt)
> 
> Move the definition into the #ifdef block.
> 
> Fixes: d099fc8f540a ("drm/ttm: new TT backend allocation pool v3")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Thanks Arnd! The patch looks good to me:

Reviewed-by: Martin Peres <martin.peres@...uf.org>

> ---
>   drivers/gpu/drm/ttm/ttm_pool.c | 29 ++++++++++++++---------------
>   1 file changed, 14 insertions(+), 15 deletions(-)
> 
> diff --git a/drivers/gpu/drm/ttm/ttm_pool.c b/drivers/gpu/drm/ttm/ttm_pool.c
> index 5455b2044759..7b2f60616750 100644
> --- a/drivers/gpu/drm/ttm/ttm_pool.c
> +++ b/drivers/gpu/drm/ttm/ttm_pool.c
> @@ -239,21 +239,6 @@ static struct page *ttm_pool_type_take(struct ttm_pool_type *pt)
>   	return p;
>   }
>   
> -/* Count the number of pages available in a pool_type */
> -static unsigned int ttm_pool_type_count(struct ttm_pool_type *pt)
> -{
> -	unsigned int count = 0;
> -	struct page *p;
> -
> -	spin_lock(&pt->lock);
> -	/* Only used for debugfs, the overhead doesn't matter */
> -	list_for_each_entry(p, &pt->pages, lru)
> -		++count;
> -	spin_unlock(&pt->lock);
> -
> -	return count;
> -}
> -
>   /* Initialize and add a pool type to the global shrinker list */
>   static void ttm_pool_type_init(struct ttm_pool_type *pt, struct ttm_pool *pool,
>   			       enum ttm_caching caching, unsigned int order)
> @@ -543,6 +528,20 @@ void ttm_pool_fini(struct ttm_pool *pool)
>   EXPORT_SYMBOL(ttm_pool_fini);
>   
>   #ifdef CONFIG_DEBUG_FS
> +/* Count the number of pages available in a pool_type */
> +static unsigned int ttm_pool_type_count(struct ttm_pool_type *pt)
> +{
> +	unsigned int count = 0;
> +	struct page *p;
> +
> +	spin_lock(&pt->lock);
> +	/* Only used for debugfs, the overhead doesn't matter */
> +	list_for_each_entry(p, &pt->pages, lru)
> +		++count;
> +	spin_unlock(&pt->lock);
> +
> +	return count;
> +}
>   
>   /* Dump information about the different pool types */
>   static void ttm_pool_debugfs_orders(struct ttm_pool_type *pt,
>