linux-kernel - Re: [PATCH] tile: avoid overflow in ns2cycles

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Date:	Thu, 6 Mar 2014 11:53:19 -0500
From:	Chris Metcalf <cmetcalf@...era.com>
To:	Henrik Austad <henrik@...tad.us>
CC:	LKML <linux-kernel@...r.kernel.org>,
	John Stultz <johnstul@...ibm.com>,
	Mike Galbraith <bitbucket@...ine.de>,
	Salman Qazi <sqazi@...gle.com>
Subject: Re: [PATCH] tile: avoid overflow in ns2cycles

On 3/4/2014 3:20 AM, Henrik Austad wrote:
> In commit 4cecf6d401a ("sched, x86: Avoid unnecessary overflow in
> sched_clock") and in recent patch "clocksource: avoid unnecessary
> overflow in cyclecounter_cyc2ns()" https://lkml.org/lkml/2014/3/4/17,
> the mult-shift approach is replaced by 2 steps to avoid storing a large,
> intermediate value that could overflow.
>
> arch/tile/kernel/time.c has a similar pattern in cycles2ns, and this
> copies the same pattern in this function
>
> CC: John Stultz <johnstul@...ibm.com>
> CC: Mike Galbraith <bitbucket@...ine.de>
> CC: Salman Qazi <sqazi@...gle.com>
> Signed-off-by: Henrik Austad <henrik@...tad.us>
> ---
>  arch/tile/kernel/time.c |   10 +++++++++-
>  1 file changed, 9 insertions(+), 1 deletion(-)

Thanks; taken into the tile tree (with some minor whitespace formatting tweaks).

-- 
Chris Metcalf, Tilera Corp.
http://www.tilera.com

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