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From: John Garry <john.garry@huawei.com>
To: Valentin Schneider <valentin.schneider@arm.com>,
	Jeremy Linton <jeremy.linton@arm.com>,
	<linux-arm-kernel@lists.infradead.org>
Cc: catalin.marinas@arm.com, will.deacon@arm.com, rjw@rjwysocki.net,
	linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org,
	sudeep.holla@arm.com, lenb@kernel.org
Subject: Re: [PATCH v2 1/2] ACPI/PPTT: Add support for ACPI 6.3 thread flag
Date: Tue, 18 Jun 2019 18:23:25 +0100
Message-ID: <f6f7f9bb-547d-3fd3-f3f8-1d55181f63d7@huawei.com> (raw)
In-Reply-To: <718438d0-8648-897a-83e8-801146a0af86@arm.com>

On 18/06/2019 15:40, Valentin Schneider wrote:
> On 18/06/2019 15:21, Jeremy Linton wrote:
> [...]
>>>> + * Return: -ENOENT if the PPTT doesn't exist, the CPU cannot be found or
>>>> + *       the table revision isn't new enough.
>>>> + * Otherwise returns flag value
>>>> + */
>>>
>>> Nit: strictly speaking we're not returning the flag value but its mask
>>> applied to the flags field. I don't think anyone will care about getting
>>> the actual flag value, but it should be made obvious in the doc:
>>
>> Or I clarify the code to actually do what the comments says. Maybe that is what John G was also pointing out too?
>>

No, I was just saying that the kernel topology can be broken without 
this series.

>
> Mmm I didn't find any reply from John regarding this in v1, but I wouldn't
> mind either way, as long as the doc & code are aligned.
>

BTW, to me, function acpi_pptt_cpu_is_thread() seems to try to do too 
much, i.e. check if the PPTT is new enough to support the thread flag 
and also check if it is set for a specific cpu. I'd consider separate 
functions here.

thanks,
John

> [...]
>
> .
>



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Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-14 22:31 [PATCH v2 0/2] arm64/PPTT ACPI 6.3 thread flag support Jeremy Linton
2019-06-14 22:31 ` [PATCH v2 1/2] ACPI/PPTT: Add support for ACPI 6.3 thread flag Jeremy Linton
2019-06-17 12:34   ` Valentin Schneider
2019-06-18 14:21     ` Jeremy Linton
2019-06-18 14:40       ` Valentin Schneider
2019-06-18 17:23         ` John Garry [this message]
2019-06-18 21:28           ` Jeremy Linton
2019-06-19  9:15             ` John Garry
2019-06-28 15:21               ` Jeremy Linton
2019-06-25 15:20     ` Sudeep Holla
2019-06-14 22:31 ` [PATCH v2 2/2] arm64: topology: Use PPTT to determine if PE is a thread Jeremy Linton

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