From mboxrd@z Thu Jan  1 00:00:00 1970
From: Catalin Marinas <catalin.marinas@arm.com>
Subject: Re: [PATCH v4 09/18] ARM64 / ACPI: Parse FADT table to get PSCI
 flags for PSCI init
Date: Mon, 15 Sep 2014 15:54:11 +0100
Message-ID: <20140915145410.GD5415@arm.com>
References: <1410530416-30200-1-git-send-email-hanjun.guo@linaro.org>
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To: Olof Johansson <olof@lixom.net>
Cc: "hanjun.guo@linaro.org" <hanjun.guo@linaro.org>, "Rafael J. Wysocki" <rjw@rjwysocki.net>, Mark Rutland <Mark.Rutland@arm.com>, "grant.likely@linaro.org" <grant.likely@linaro.org>, Will Deacon <Will.Deacon@arm.com>, "graeme.gregory@linaro.org" <graeme.gregory@linaro.org>, Arnd Bergmann <arnd@arndb.de>, Sudeep Holla <Sudeep.Holla@arm.com>, "jcm@redhat.com" <jcm@redhat.com>, Jason Cooper <jason@lakedaemon.net>, Marc Zyngier <Marc.Zyngier@arm.com>, Bjorn Helgaas <bhelgaas@google.com>, Daniel Lezcano <daniel.lezcano@linaro.org>, Mark Brown <broonie@kernel.org>, Rob Herring <robh@kernel.org>, Robert Richter <rric@kernel.org>, Lv Zheng <lv.zheng@intel.com>, Robert Moore <robert.moore@intel.com>, Lorenzo Pieralisi <Lorenzo.Pieralisi@arm.com>, Liviu Dudau <Liviu.Dudau@arm.com>, Randy Dunlap <rdunlap@infradead.org>, Charles Garcia-Tobin <Charles.Garcia-Tobin@arm.com>lin
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On Mon, Sep 15, 2014 at 07:38:08AM +0100, Olof Johansson wrote:
> On Fri, Sep 12, 2014 at 10:00:07PM +0800, Hanjun Guo wrote:
> > +static int __init acpi_parse_fadt(struct acpi_table_header *table)
> > +{
> > +	struct acpi_table_fadt *fadt = (struct acpi_table_fadt *)table;
> > +
> > +	/*
> > +	 * Revision in table header is the FADT Major revision,
> > +	 * and there is a minor revision of FADT which was introduced
> > +	 * by ACPI 5.1, we only deal with ACPI 5.1 or higher revision
> > +	 * to get arm boot flags, or we will disable ACPI.
> > +	 */
> > +	if (table->revision > 5 ||
> > +	    (table->revision == 5 && fadt->minor_revision >= 1))
> > +		return 0;
> 
> The commend and code disagree. The code says 5.1 or newer, while the comment say
> _only_ 5.1. One or the other needs to change.

I don't think the comment and code disagree, it says "we only deal with
ACPI 5.1 _or_ higher revision".

But since you mention it and following my other thread with Grant, I
think at least for now we should make this check 5.1 only.

-- 
Catalin