Date: Tue, 28 Mar 2017 14:05:52 +0100
From: Mark Rutland <mark.rutland@arm.com>
To: Fu Wei <fu.wei@linaro.org>
Cc: Jon Masters <jcm@jonmasters.org>,
        "Rafael J. Wysocki" <rjw@rjwysocki.net>, Len Brown <lenb@kernel.org>,
        Daniel Lezcano <daniel.lezcano@linaro.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Marc Zyngier <marc.zyngier@arm.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
        Sudeep Holla <sudeep.holla@arm.com>,
        Hanjun Guo <hanjun.guo@linaro.org>,
        linux-arm-kernel@lists.infradead.org,
        Linaro ACPI Mailman List <linaro-acpi@lists.linaro.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        ACPI Devel Maling List <linux-acpi@vger.kernel.org>,
        rruigrok@codeaurora.org, "Abdulhamid, Harb" <harba@codeaurora.org>,
        Christopher Covington <cov@codeaurora.org>,
        Timur Tabi <timur@codeaurora.org>,
        G Gregory <graeme.gregory@linaro.org>, Al Stone <al.stone@linaro.org>,
        Jon Masters <jcm@redhat.com>, Wei Huang <wei@redhat.com>,
        Arnd Bergmann <arnd@arndb.de>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Will Deacon <will.deacon@arm.com>,
        Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com>,
        Leo Duran <leo.duran@amd.com>, Wim Van Sebroeck <wim@iguana.be>,
        Guenter Roeck <linux@roeck-us.net>, linux-watchdog@vger.kernel.org,
        Tomasz Nowicki <tn@semihalf.com>,
        Christoffer Dall <christoffer.dall@linaro.org>,
        Julien Grall <julien.grall@arm.com>
Subject: Re: [PATCH v22 00/11] acpi, clocksource: add GTDT driver and GTDT
 support in arm_arch_timer
Message-ID: <20170328130552.GA8643@leverpostej>
References: <20170321163122.9183-1-fu.wei@linaro.org>
 <1cc5a994-0af6-79ea-930d-44b3fc789427@jonmasters.org>
 <CADyBb7ujZKDF0aUJZRUN81jor04mZ-V5ESWScAjaxoHQUeVFSA@mail.gmail.com>
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On Tue, Mar 28, 2017 at 08:34:12PM +0800, Fu Wei wrote:
> Hi Jon,
> 
> Thanks for your email
>  An hour ago, I just got some feedback from Lorenzo, will update my
> patchset ASAP according to his suggestion.
> 
> But I still need some feedback form Mark, I can see some progress here:
> https://git.kernel.org/pub/scm/linux/kernel/git/mark/linux.git/log/?h=arch-timer/gtdt
> 
> I guess I should rebase my patchset to his gtdt branch for v23.
> 
> So now, I am waiting for Mark's feedback to move on.

Sorry for the delay; I have not had the time to focus on this as I would
like to. I'm happy with patches 1-4, but from patch 5 onwards, there's
one change I'd like to see.

I'd prefer that mmio timer frame rame N was always stored at
arch_timer_mem::frame[N], rather than arch_timer_mem::frame[] being in
an arbitrary order. That will make arch_timer_mem_frame::frame_nr
redundant.

To allow arch_timer_mem::frame[] this to be sparse, I'm happy to have a
bool arch_timer_mem_frame::valid field that we set when probing each
frame. Then we don't need arch_timer_mem::num_frames.

This will make iterating over the frames far less confusing, and makes
it simple to detect when a frame number is erroneously reused.

Otherwise, I'm largely happy to pick the rest and apply any fixups
myself.

Thanks,
Mark.