linux-kernel - Re: [PATCH v11 05/10] x86/resctrl: Unwind the errors inside rdt_enable

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Message-ID: <f9bd5402-0377-6d75-5782-8bef29759c90@intel.com>
Date:   Mon, 9 Oct 2023 10:40:32 -0700
From:   Fenghua Yu <fenghua.yu@...el.com>
To:     Borislav Petkov <bp@...en8.de>, Babu Moger <babu.moger@....com>
CC:     <corbet@....net>, <reinette.chatre@...el.com>,
        <tglx@...utronix.de>, <mingo@...hat.com>,
        <dave.hansen@...ux.intel.com>, <x86@...nel.org>, <hpa@...or.com>,
        <paulmck@...nel.org>, <akpm@...ux-foundation.org>,
        <quic_neeraju@...cinc.com>, <rdunlap@...radead.org>,
        <damien.lemoal@...nsource.wdc.com>, <songmuchun@...edance.com>,
        <peterz@...radead.org>, <jpoimboe@...nel.org>,
        <pbonzini@...hat.com>, <chang.seok.bae@...el.com>,
        <pawan.kumar.gupta@...ux.intel.com>, <jmattson@...gle.com>,
        <daniel.sneddon@...ux.intel.com>, <sandipan.das@....com>,
        <tony.luck@...el.com>, <james.morse@....com>,
        <linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <bagasdotme@...il.com>, <eranian@...gle.com>,
        <christophe.leroy@...roup.eu>, <jarkko@...nel.org>,
        <adrian.hunter@...el.com>, <quic_jiles@...cinc.com>,
        <peternewman@...gle.com>
Subject: Re: [PATCH v11 05/10] x86/resctrl: Unwind the errors inside
 rdt_enable_ctx()

Hi, Babu,

On 10/9/23 10:25, Borislav Petkov wrote:
> On Tue, Oct 03, 2023 at 06:54:25PM -0500, Babu Moger wrote:
>> rdt_enable_ctx() enables the features provided during resctrl mount.
>>
>> Additions to rdt_enable_ctx() are required to also modify error paths
>> of rdt_enable_ctx() callers to ensure correct unwinding if errors
>> are encountered after calling rdt_enable_ctx(). This is error prone.
>>
>> Introduce rdt_disable_ctx() to refactor the error unwinding of
>> rdt_enable_ctx() to simplify future additions. This also simplifies
>> cleanup in rdt_kill_sb().
>>
>> Remove cdp_disable_all() as it is not used anymore after the refactor.
> 
> Do not talk about *what* the patch is doing in the commit message - that
> should be obvious from the diff itself. Rather, concentrate on the *why*
> it needs to be done.
> 
> Check your whole series.

When you send the next patch set, please add the change log in each 
patch after the "---" instead of in the cover patch only. So Boris and 
others clearly know what are changed in each patch.

Thanks.

-Fenghua