linux-kernel - Re: [PATCH linux-next] drm/i915/request: Remove unused variables

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Date:   Mon, 22 Nov 2021 11:09:21 +0200
From:   Jani Nikula <jani.nikula@...ux.intel.com>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        cgel.zte@...il.com
Cc:     joonas.lahtinen@...ux.intel.com, rodrigo.vivi@...el.com,
        airlied@...ux.ie, daniel@...ll.ch, intel-gfx@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        yong yiran <yong.yiran@....com.cn>,
        Zeal Robot <zealci@....com.cn>,
        Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>
Subject: Re: [PATCH linux-next] drm/i915/request: Remove unused variables

On Sun, 21 Nov 2021, Christophe JAILLET <christophe.jaillet@...adoo.fr> wrote:
> Le 21/11/2021 à 11:13, cgel.zte@...il.com a écrit :
>> From: yong yiran <yong.yiran@....com.cn>
>> 
>> The clang_analyzer complains as follows:
>> drivers/gpu/drm/i915/i915_request.c:2119:2 warning:
>> Value stored to 'x' is never read
>> 
>> Reported-by: Zeal Robot <zealci@....com.cn>
>> Signed-off-by: yong yiran <yong.yiran@....com.cn>

The sender's Signed-off-by is missing.

>> ---
>>   drivers/gpu/drm/i915/i915_request.c | 3 ---
>>   1 file changed, 3 deletions(-)
>> 
>> diff --git a/drivers/gpu/drm/i915/i915_request.c b/drivers/gpu/drm/i915/i915_request.c
>> index 820a1f38b271..5e4420f461e9 100644
>> --- a/drivers/gpu/drm/i915/i915_request.c
>> +++ b/drivers/gpu/drm/i915/i915_request.c
>> @@ -2047,7 +2047,6 @@ void i915_request_show(struct drm_printer *m,
>>   {
>>   	const char *name = rq->fence.ops->get_timeline_name((struct dma_fence *)&rq->fence);
>>   	char buf[80] = "";
>> -	int x = 0;
>>   
>>   	/*
>>   	 * The prefix is used to show the queue status, for which we use
>> @@ -2079,8 +2078,6 @@ void i915_request_show(struct drm_printer *m,
>>   	 *      from the lists
>>   	 */
>>   
>> -	x = print_sched_attr(&rq->sched.attr, buf, x, sizeof(buf));
>> -
>
> Seriously?

Basically I've started considering all of these patches as static
analyzer reports *only*. The "fixes" have often been completely wrong or
have missed the real issue and merely silenced the warning.

I really couldn't say anything about the "Zeal Robot" itself, but the
patches are giving it a bad reputation.


BR,
Jani.




>
> CJ
>
>
>>   	drm_printf(m, "%s%.*s%c %llx:%lld%s%s %s @ %dms: %s\n",
>>   		   prefix, indent, "                ",
>>   		   queue_status(rq),
>> 
>

-- 
Jani Nikula, Intel Open Source Graphics Center