linux-kernel - Re: [PATCH 06/12] time: Add infrastructure to cap clocksource reads to the max

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Message-ID: <20150307093214.GE30888@gmail.com>
Date:	Sat, 7 Mar 2015 10:32:14 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	John Stultz <john.stultz@...aro.org>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	Dave Jones <davej@...emonkey.org.uk>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Richard Cochran <richardcochran@...il.com>,
	Prarit Bhargava <prarit@...hat.com>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH 06/12] time: Add infrastructure to cap clocksource reads
 to the max_cycles value


* John Stultz <john.stultz@...aro.org> wrote:

> When calculating the current delta since the last tick, we
> currently have no hard protections to prevent a multiplciation

Typo.

> overflow from ocurring.

Typo.

> This patch introduces infrastructure to allow a capp that

Typo ...

> +static inline cycle_t timekeeping_get_delta(struct tk_read_base *tkr)
> +{
> +	/* calculate the delta since the last update_wall_time */
> +	return clocksource_delta(tkr->read(tkr->clock), tkr->cycle_last,
> +								tkr->mask);

Please don't do spurious col80 line breaks that don't improve the end 
result.

Thanks,

	Ingo
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