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Date: Fri, 19 Jul 2013 15:27:18 +0100 From: Russell King - ARM Linux <linux@....linux.org.uk> To: Nicolas Pitre <nicolas.pitre@...aro.org> Cc: Will Deacon <will.deacon@....com>, Stephen Boyd <sboyd@...eaurora.org>, John Stultz <john.stultz@...aro.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>, "linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>, Thomas Gleixner <tglx@...utronix.de>, Catalin Marinas <Catalin.Marinas@....com>, Christopher Covington <cov@...eaurora.org> Subject: Re: [PATCH v4 02/17] sched_clock: Use seqcount instead of rolling our own On Fri, Jul 19, 2013 at 10:20:19AM -0400, Nicolas Pitre wrote: > On Fri, 19 Jul 2013, Will Deacon wrote: > > > Looks good to me. The current scheme would be very fiddly to extend to > > 64-bit values on 32-bit architectures without cheap atomic doubleword > > accesses. > > You should have a look at include/linux/cnt32_to_63.h. > This could be applied to pure software counters if the low part is > atomically increased. But this can't be used for sched_clock(). That's exactly why I originally had to rewrite that thing in the first place. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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