linux-kernel - Re: [PATCH] drm/amd/pm: make power values signed

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Date:   Fri, 10 Nov 2023 13:27:23 +0200
From:   José Pekkarinen <jose.pekkarinen@...hound.fi>
To:     "Lazar, Lijo" <lijo.lazar@....com>
Cc:     evan.quan@....com, alexander.deucher@....com,
        christian.koenig@....com, Xinhui.Pan@....com,
        skhan@...uxfoundation.org, jdelvare@...e.com,
        linux-kernel@...r.kernel.org, amd-gfx@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org, daniel@...ll.ch,
        airlied@...il.com, linux@...ck-us.net,
        linux-kernel-mentees@...ts.linux.dev
Subject: Re: [PATCH] drm/amd/pm: make power values signed

On 2023-11-10 10:25, Lazar, Lijo wrote:
> On 11/9/2023 2:11 PM, José Pekkarinen wrote:
>> The following patch will convert the power values returned by
>> amdgpu_hwmon_get_power to signed, fixing the following warnings 
>> reported
>> by coccinelle:
>> 
>> 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, 2 insertions(+), 2 deletions(-)
>> 
>> diff --git a/drivers/gpu/drm/amd/pm/amdgpu_pm.c 
>> b/drivers/gpu/drm/amd/pm/amdgpu_pm.c
>> index e7bb1d324084..913ff62d5d5e 100644
>> --- a/drivers/gpu/drm/amd/pm/amdgpu_pm.c
>> +++ b/drivers/gpu/drm/amd/pm/amdgpu_pm.c
>> @@ -2795,7 +2795,7 @@ static ssize_t 
>> amdgpu_hwmon_show_power_avg(struct device *dev,
>>   					   struct device_attribute *attr,
>>   					   char *buf)
>>   {
>> -	unsigned int val;
>> +	int val;
> 
> Hi Alex,
> 
> It's a different code in drm-next.
> 
> https://gitlab.freedesktop.org/agd5f/linux/-/blob/amd-staging-drm-next/drivers/gpu/drm/amd/pm/amdgpu_pm.c#L2936

     I checked it, and ssize_t also removes the warning,
so you can stay with whatever is in the amd-staging-drm-next
tree and ignore this.

     Thanks!

     José.