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From: Sudeep Holla <sudeep.holla@arm.com>
To: Valentin Schneider <valentin.schneider@arm.com>
Cc: rjw@rjwysocki.net, catalin.marinas@arm.com, will.deacon@arm.com,
	linux-kernel@vger.kernel.org,
	Jeremy Linton <jeremy.linton@arm.com>,
	linux-acpi@vger.kernel.org, Sudeep Holla <sudeep.holla@arm.com>,
	linux-arm-kernel@lists.infradead.org, lenb@kernel.org
Subject: Re: [PATCH v2 1/2] ACPI/PPTT: Add support for ACPI 6.3 thread flag
Date: Tue, 25 Jun 2019 16:20:38 +0100
Message-ID: <20190625152029.GA2308@e107155-lin> (raw)
In-Reply-To: <667f95c0-5aa9-f460-a49a-e6dfefc027d8@arm.com>

On Mon, Jun 17, 2019 at 01:34:51PM +0100, Valentin Schneider wrote:
> Hi Jeremy,
>
> Few nits below.
>
> Also, I had a look at the other PPTT processor flags that were introduced
> in 6.3, and the only other one being used is ACPI_LEAF_NODE in
> acpi_pptt_leaf_node(). However that one already has a handle on the table
> header, so the check_acpi_cpu_flag() isn't of much help there.
>
> I don't believe the other existing flags will benefit from the helper since
> they are more about describing the PPTT tree, but I think it doesn't hurt
> to keep it around for potential future flags.
>
> On 14/06/2019 23:31, Jeremy Linton wrote:
> [...]
> > @@ -517,6 +517,43 @@ static int find_acpi_cpu_topology_tag(unsigned int cpu, int level, int flag)
> >  	return retval;
> >  }
> >
> > +/**
> > + * check_acpi_cpu_flag() - Determine if CPU node has a flag set
> > + * @cpu: Kernel logical CPU number
> > + * @rev: The PPTT revision defining the flag
> > + * @flag: The flag itself

How about the "the processor structure flag being examined" ?

> > + *
> > + * Check the node representing a CPU for a given flag.
> > + *
> > + * 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:
>

I agree with that. I am also fine if you want to change the code to
return 0 or 1 based on the flag value. It then aligns well with comment
under acpi_pptt_cpu_is_thread. Either way, we just need consistency.

--
Regards,
Sudeep

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  parent reply index

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
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 [this message]
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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