linux-kernel - Re: [PATCH] Btrfs: fix 64 bit divide problem

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Message-ID: <20110821071951.GA4013@kernel.org>
Date:	Sun, 21 Aug 2011 09:19:55 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Josef Bacik <josef@...hat.com>
Cc:	linux-kernel@...r.kernel.org, linux-btrfs@...r.kernel.org,
	torvalds@...ux-foundation.org, liubo2009@...fujitsu.com
Subject: Re: [PATCH] Btrfs: fix 64 bit divide problem


* Josef Bacik <josef@...hat.com> wrote:

> This fixes a regression introduced by
> 
> cdcb725c05fe0cb71777c66ddc2445fedbbb3c59
> 
> In cases where we need to divide/multiply by 2 we should just left/right shift
> respectively, and in cases where theres N number of devices use do_div.  Also
> make the counters u64 to match up with rw_devices.  Thanks,
> 
> Signed-off-by: Josef Bacik <josef@...hat.com>

Acked-and-tested-by: Ingo Molnar <mingo@...e.hu>

Thanks,

	Ingo
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