linux-kernel - Re: [PATCH V2] x86/intel_rdt: Ensure usage of CPUs are locked while needed

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Message-ID: <10fef6af-785e-c76f-d89b-ec115dcf460a@intel.com>
Date:   Tue, 11 Dec 2018 12:51:12 -0800
From:   Reinette Chatre <reinette.chatre@...el.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     tglx@...utronix.de, fenghua.yu@...el.com, tony.luck@...el.com,
        gavin.hindman@...el.com, jithu.joseph@...el.com, mingo@...hat.com,
        hpa@...or.com, x86@...nel.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org
Subject: Re: [PATCH V2] x86/intel_rdt: Ensure usage of CPUs are locked while
 needed

Hi Boris,

On 12/11/2018 12:43 PM, Borislav Petkov wrote:
> On Tue, Dec 11, 2018 at 11:02:08AM -0800, Reinette Chatre wrote:
>> I just wanted to emphasize that it is not the schemata writing that
>> needs to be protected, but instead the pseudo-locking code that runs
>> after schemata programming that needs to run on a particular CPU. The
>> new patch subject could be interpreted to mean the former ... but that
>> is starting to sound like nitpicking by me.
> 
> Nah, that's not nitpicking - it is important that we sort out stuff
> fully before committing.

I really appreciate your patience.

> 
> Now, I'm trying to understand what you're telling me and I believe you
> mean what update_domains() does, yes?

Yes.

> 
> And I guess a more fitting subject in that case could be:
> 
>   x86/intel_rdt: Ensure a CPU remains online for the region's pseudo-locking sequence
> 
> or so, and then the commit message explains in more detail what that
> title actually means. :)
> 
> Hmmm.

That subject line matches exactly the goal of this patch. Thank you very
much. Would you prefer that I send a new version with this subject line
or would you rather make the change yourself while applying this patch?

Reinette