linux-kernel - Re: [PATCH linux-next] drm/i915/display: Delete redundant post

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Message-ID: <87lf0v44j4.fsf@intel.com>
Date:   Wed, 08 Dec 2021 15:20:15 +0200
From:   Jani Nikula <jani.nikula@...ux.intel.com>
To:     Ville Syrjälä <ville.syrjala@...ux.intel.com>,
        cgel.zte@...il.com
Cc:     Stephen Rothwell <sfr@...b.auug.org.au>,
        David Airlie <airlied@...ux.ie>,
        intel-gfx@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org,
        luo penghao <luo.penghao@....com.cn>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Zeal Robot <zealci@....com.cn>
Subject: Re: [PATCH linux-next] drm/i915/display: Delete redundant post_mask
 assignment

On Wed, 08 Dec 2021, Ville Syrjälä <ville.syrjala@...ux.intel.com> wrote:
> On Wed, Dec 08, 2021 at 07:46:19AM +0000, cgel.zte@...il.com wrote:
>> From: luo penghao <luo.penghao@....com.cn>
>> 
>> This value will be overwritten by the following if statement, even
>> if the if is not executed, the value will not be used
>> 
>> The clang_analyzer complains as follows:
>> 
>> Value stored to 'port_mask' is never read
>> 
>> Reported-by: Zeal Robot <zealci@....com.cn>
>> Signed-off-by: luo penghao <luo.penghao@....com.cn>
>> ---
>>  drivers/gpu/drm/i915/display/intel_ddi.c | 1 -
>>  1 file changed, 1 deletion(-)
>> 
>> diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
>> index bd18432..3aad0c3 100644
>> --- a/drivers/gpu/drm/i915/display/intel_ddi.c
>> +++ b/drivers/gpu/drm/i915/display/intel_ddi.c
>> @@ -2011,7 +2011,6 @@ void intel_ddi_sanitize_encoder_pll_mapping(struct intel_encoder *encoder)
>>  			return;
>>  	}
>>  
>> -	port_mask = BIT(encoder->port);
>>  	ddi_clk_needed = encoder->base.crtc;
>>  
>>  	if (encoder->type == INTEL_OUTPUT_DSI) {
>
> 'port_mask' declaration could now be moved into this block.

I've basically given up on patches from cgel.zte@...il.com,
luo.penghao@....com.cn, zealci@....com.cn, etc. The patches are the
simplest possible changes to silence static analyzer warnings, with no
further analysis of the issues, and no follow-up on questions.

Until that changes, I think we're better off just regarding them static
as analyzer reports.


BR,
Jani.


>
>> -- 
>> 2.15.2
>> 

-- 
Jani Nikula, Intel Open Source Graphics Center