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

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Date:   Wed, 16 Dec 2020 16:40:58 +0100
From:   Christian König <christian.koenig@....com>
To:     Martin Peres <martin.peres@...uf.org>,
        Arnd Bergmann <arnd@...nel.org>, 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

Am 08.12.20 um 10:43 schrieb Christian König:
> Am 08.12.20 um 09:18 schrieb Martin Peres:
>> 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>
>
> Reviewed-by: Christian König <christian.koenig@....com>

I've just pushed that to drm-misc-next-fixes.

Christian.

>
>>
>>> ---
>>>   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,
>>>
>