linux-kernel - Re: [PATCH] drm/amd/pm: clean up redundant comparisons with 0

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Message-ID: <65d132b0dbef66039fd6938ecbc2bf68@foxhound.fi>
Date:   Tue, 07 Nov 2023 19:26:10 +0200
From:   José Pekkarinen <jose.pekkarinen@...hound.fi>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     evan.quan@....com, alexander.deucher@....com,
        christian.koenig@....com, Xinhui.Pan@....com,
        skhan@...uxfoundation.org, airlied@...il.com, daniel@...ll.ch,
        jdelvare@...e.com, amd-gfx@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        linux-hwmon@...r.kernel.org, linux-kernel-mentees@...ts.linux.dev
Subject: Re: [PATCH] drm/amd/pm: clean up redundant comparisons with 0

On 2023-11-07 16:08, Guenter Roeck wrote:
> On 11/7/23 00:29, José Pekkarinen wrote:
>> There is a couple of function return checks of functions that return
>> unsigned values, and local variables to hold them are also unsigned, 
>> so
>> checking if they are negative will always return false. This patch 
>> will
>> remove them, as well as the never reached code.
>> 
>> drivers/gpu/drm/amd/pm/amdgpu_pm.c:2801:5-8: WARNING: Unsigned 
>> expression compared with zero: val < 0
>> drivers/gpu/drm/amd/pm/amdgpu_pm.c:2814:5-8: WARNING: Unsigned 
>> expression compared with zero: val < 0
>> 
>> Signed-off-by: José Pekkarinen <jose.pekkarinen@...hound.fi>
>> ---
>>   drivers/gpu/drm/amd/pm/amdgpu_pm.c | 4 ----
>>   1 file changed, 4 deletions(-)
>> 
>> diff --git a/drivers/gpu/drm/amd/pm/amdgpu_pm.c 
>> b/drivers/gpu/drm/amd/pm/amdgpu_pm.c
>> index 8bb2da13826f..e7bb1d324084 100644
>> --- a/drivers/gpu/drm/amd/pm/amdgpu_pm.c
>> +++ b/drivers/gpu/drm/amd/pm/amdgpu_pm.c
>> @@ -2798,8 +2798,6 @@ static ssize_t 
>> amdgpu_hwmon_show_power_avg(struct device *dev,
>>   	unsigned int val;
>>     	val = amdgpu_hwmon_get_power(dev, 
>> AMDGPU_PP_SENSOR_GPU_AVG_POWER);
>> -	if (val < 0)
>> -		return val;
>> 
> 
> This is reporting errors returned from amdgpu_hwmon_get_power() as
> large integers.

     Alright, that case it is a false positive, thanks for the comment!

     José.