Re: [PATCH] clocksource: Store reg field within struct clocksource

From	Marc Gonzalez <marc_gonzalez@sigmadesigns.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH] clocksource: Store reg field within struct clocksource
Date	2015-11-19 13:50 +0100
Message-ID	<qwwP0-VP-13@gated-at.bofh.it> (permalink)
References	(1 earlier) <qweIq-60C-7@gated-at.bofh.it> <qwuNc-85h-7@gated-at.bofh.it> <qwuNc-85h-5@gated-at.bofh.it> <qwv6y-8c4-11@gated-at.bofh.it> <qwvzB-by-37@gated-at.bofh.it>
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On 19/11/2015 12:21, Russell King wrote:

> When I wrote the MMIO clocksource implementation, there was no
> ____cacheline_aligned on struct clocksource, and the arrangement I came
> to for the structure put the 'reg' and 'read' within the same cache line
> (note that the MMIO clocksource pre-dates Thomas' rearrangement of struct
> clocksource and the addition of the cache line alignment.)  The original
> layout did not have any padding gaps.

For the record, I pointed out the chronology in a previous discussion.
But Thomas didn't comment at the time :-(

http://thread.gmane.org/gmane.linux.ports.arm.kernel/402968/focus=403604

Mason wrote:
> Oh and while I have your attention ;-) I have alignment-related
> questions about clocksource_mmio_init() (commit 442c8176d2) wrt
> Thomas Gleixner's 369db4c952 patch. (I think the two patches
> do not play nice.)

Regards.

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Thread

[PATCH] clocksource: Store reg field within struct clocksource Marc Gonzalez <marc_gonzalez@sigmadesigns.com> - 2015-11-18 14:50 +0100
  Re: [PATCH] clocksource: Store reg field within struct clocksource Måns Rullgård <mans@mansr.com> - 2015-11-18 15:00 +0100
  Re: [PATCH] clocksource: Store reg field within struct clocksource Russell King - ARM Linux <linux@arm.linux.org.uk> - 2015-11-18 18:30 +0100
    Re: [PATCH] clocksource: Store reg field within struct clocksource Marc Gonzalez <marc_gonzalez@sigmadesigns.com> - 2015-11-19 10:40 +0100
      Re: [PATCH] clocksource: Store reg field within struct clocksource Russell King - ARM Linux <linux@arm.linux.org.uk> - 2015-11-19 11:40 +0100
        Re: [PATCH] clocksource: Store reg field within struct clocksource Thomas Gleixner <tglx@linutronix.de> - 2015-11-19 11:40 +0100
          Re: [PATCH] clocksource: Store reg field within struct clocksource Russell King - ARM Linux <linux@arm.linux.org.uk> - 2015-11-19 11:50 +0100
    Re: [PATCH] clocksource: Store reg field within struct clocksource Russell King - ARM Linux <linux@arm.linux.org.uk> - 2015-11-19 11:40 +0100
      Re: [PATCH] clocksource: Store reg field within struct clocksource Thomas Gleixner <tglx@linutronix.de> - 2015-11-19 11:50 +0100
        Re: [PATCH] clocksource: Store reg field within struct clocksource Russell King - ARM Linux <linux@arm.linux.org.uk> - 2015-11-19 12:10 +0100
          Re: [PATCH] clocksource: Store reg field within struct clocksource Thomas Gleixner <tglx@linutronix.de> - 2015-11-19 12:20 +0100
            Re: [PATCH] clocksource: Store reg field within struct clocksource Marc Gonzalez <marc_gonzalez@sigmadesigns.com> - 2015-11-19 13:30 +0100
              Re: [PATCH] clocksource: Store reg field within struct clocksource Thomas Gleixner <tglx@linutronix.de> - 2015-11-19 15:00 +0100
                Re: [PATCH] clocksource: Store reg field within struct clocksource Marc Gonzalez <marc_gonzalez@sigmadesigns.com> - 2015-11-24 13:40 +0100
            [tip:timers/core] timekeeping:   Lift clocksource cacheline restriction tip-bot for Thomas Gleixner <tipbot@zytor.com> - 2015-11-25 22:40 +0100
      Re: [PATCH] clocksource: Store reg field within struct clocksource Marc Gonzalez <marc_gonzalez@sigmadesigns.com> - 2015-11-19 12:00 +0100
        Re: [PATCH] clocksource: Store reg field within struct clocksource Russell King - ARM Linux <linux@arm.linux.org.uk> - 2015-11-19 12:30 +0100
          Re: [PATCH] clocksource: Store reg field within struct clocksource Marc Gonzalez <marc_gonzalez@sigmadesigns.com> - 2015-11-19 13:50 +0100
    Re: [PATCH] clocksource: Store reg field within struct clocksource Thomas Gleixner <tglx@linutronix.de> - 2015-11-19 11:40 +0100

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