linux-kernel - Re: [PATCH -next] drm/komeda: remove set but not used variable 'old'

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Date:   Mon, 22 Jul 2019 09:44:01 +0800
From:   Yuehaibing <yuehaibing@...wei.com>
To:     <james.qian.wang@....com>, <liviu.dudau@....com>,
        <brian.starkey@....com>, <airlied@...ux.ie>,
        <linux-kernel@...r.kernel.org>, <dri-devel@...ts.freedesktop.org>
Subject: Re: [PATCH -next] drm/komeda: remove set but not used variable 'old'

On 2019/7/19 21:04, Daniel Vetter wrote:
> On Thu, Jul 18, 2019 at 08:51:50PM +0200, Daniel Vetter wrote:
>> On Tue, Jul 09, 2019 at 09:58:08PM +0800, YueHaibing wrote:
>>> Fixes gcc '-Wunused-but-set-variable' warning:
>>>
>>> drivers/gpu/drm/arm/display/komeda/komeda_plane.c:
>>>  In function komeda_plane_atomic_duplicate_state:
>>> drivers/gpu/drm/arm/display/komeda/komeda_plane.c:161:35:
>>>  warning: variable old set but not used [-Wunused-but-set-variable
>>>
>>> It is not used since commit 990dee3aa456 ("drm/komeda:
>>> Computing image enhancer internally")
>>>
>>> Reported-by: Hulk Robot <hulkci@...wei.com>
>>> Signed-off-by: YueHaibing <yuehaibing@...wei.com>
>>
>> Queued for 5.3, thanks for your patch.
> 
> Correction, this doesn't even compile. Please compile-test patches before
> submitting.
> 

Oops, sorry for this, I'll be more carefully.

> Thanks, Daniel
> 
>> -Daniel
>>
>>> ---
>>>  drivers/gpu/drm/arm/display/komeda/komeda_plane.c | 4 ----
>>>  1 file changed, 4 deletions(-)
>>>
>>> diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_plane.c b/drivers/gpu/drm/arm/display/komeda/komeda_plane.c
>>> index c095af1..c1381ac 100644
>>> --- a/drivers/gpu/drm/arm/display/komeda/komeda_plane.c
>>> +++ b/drivers/gpu/drm/arm/display/komeda/komeda_plane.c
>>> @@ -158,8 +158,6 @@ static void komeda_plane_reset(struct drm_plane *plane)
>>>  static struct drm_plane_state *
>>>  komeda_plane_atomic_duplicate_state(struct drm_plane *plane)
>>>  {
>>> -	struct komeda_plane_state *new, *old;
>>> -
>>>  	if (WARN_ON(!plane->state))
>>>  		return NULL;
>>>  
>>> @@ -169,8 +167,6 @@ komeda_plane_atomic_duplicate_state(struct drm_plane *plane)
>>>  
>>>  	__drm_atomic_helper_plane_duplicate_state(plane, &new->base);
>>>  
>>> -	old = to_kplane_st(plane->state);
>>> -
>>>  	return &new->base;
>>>  }
>>>  
>>> -- 
>>> 2.7.4
>>>
>>>
>>
>> -- 
>> Daniel Vetter
>> Software Engineer, Intel Corporation
>> http://blog.ffwll.ch
>