linux-kernel - Re: [PATCH v10 24/24] x86/resctrl: Introduce interface to modify assignment states of the groups

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Message-ID: <d5e40586-909b-44f2-ad37-e138b3328015@amd.com>
Date: Sat, 21 Dec 2024 09:28:54 -0600
From: "Moger, Babu" <bmoger@....com>
To: Reinette Chatre <reinette.chatre@...el.com>,
 Babu Moger <babu.moger@....com>, corbet@....net, tglx@...utronix.de,
 mingo@...hat.com, bp@...en8.de, dave.hansen@...ux.intel.com,
 tony.luck@...el.com, peternewman@...gle.com
Cc: fenghua.yu@...el.com, x86@...nel.org, hpa@...or.com, paulmck@...nel.org,
 akpm@...ux-foundation.org, thuth@...hat.com, rostedt@...dmis.org,
 xiongwei.song@...driver.com, pawan.kumar.gupta@...ux.intel.com,
 daniel.sneddon@...ux.intel.com, jpoimboe@...nel.org, perry.yuan@....com,
 sandipan.das@....com, kai.huang@...el.com, xiaoyao.li@...el.com,
 seanjc@...gle.com, xin3.li@...el.com, andrew.cooper3@...rix.com,
 ebiggers@...gle.com, mario.limonciello@....com, james.morse@....com,
 tan.shaopeng@...itsu.com, linux-doc@...r.kernel.org,
 linux-kernel@...r.kernel.org, maciej.wieczor-retman@...el.com,
 eranian@...gle.com
Subject: Re: [PATCH v10 24/24] x86/resctrl: Introduce interface to modify
 assignment states of the groups

Hi Reinette,

On 12/19/2024 9:23 PM, Reinette Chatre wrote:
> Hi Babu,
> 
> On 12/12/24 12:15 PM, Babu Moger wrote:
>> Introduce the interface to assign MBM events in mbm_cntr_assign mode.
> 
> Seems like something is missing ... there is no mention about what
> MBM events are assigned "to".

Sure. Will add some context.

> 
> ...
> 
>> +	if (assign_state & ASSIGN_LOCAL) {
>> +		ret = rdtgroup_assign_cntr_event(r, rdtgrp, d, QOS_L3_MBM_LOCAL_EVENT_ID);
>> +		if (ret)
>> +			goto out_fail;
>> +	}
>> +
>> +	goto next;
>> +
>> +out_fail:
>> +	sprintf(domain, d ? "%ld" : "*", dom_id);
>> +
> 
> The static checker I tried complains that dom_id can be used uninitialized.

Interesting.
dom_id can be uninitialized. That is why we have check "d ?"

unsigned long dom_id = 0;

This might help.

Thanks
Babu