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Date: Thu, 20 Nov 2008 17:46:04 +0000 From: "Will Newton" <will.newton@...il.com> To: "Tim Bird" <tim.bird@...sony.com> Cc: linux-kernel <linux-kernel@...r.kernel.org>, "Andrew Morton" <akpm@...ux-foundation.org> Subject: Re: [PATCH] init/main.c: Use ktime accessor function in initcall_debug code. On Thu, Nov 20, 2008 at 5:39 PM, Tim Bird <tim.bird@...sony.com> wrote: > Will Newton wrote: >> The initcall_debug code access the tv64 member of ktime. This won't work >> correctly for large deltas on platforms that don't use the scalar ktime >> implementation. > > In principle I see no problem with this. But as a matter of > practice it may be overkill. Possibly, but it makes the code clearer I think. > How big does the delta have to be for this to be a problem? > And how much overhead does ktime_to_ns() add? Deltas over a second will be incorrect. I have serial8250_init taking 8 seconds at the moment, so that isn't unheard of. On scalar ktime architectures it should be zero, on others a multiply and an add (it's an inline). I wouldn't call it a fast path though. > -- Tim > > ============================= > Tim Bird > Architecture Group Chair, CE Linux Forum > Senior Staff Engineer, Sony Corporation of America > ============================= > > -- 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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