linux-kernel - Re: [PATCH] Make div64_u64() precise on 32bit platforms

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Date:	Thu, 21 Oct 2010 20:12:20 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Brian Behlendorf <behlendorf1@...l.gov>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] Make div64_u64() precise on 32bit platforms

Andrew, please drop

	lib-div64c-document-that-div64_u64-is-not-precise-on-32bit-platforms.patch

On 10/21, Brian Behlendorf wrote:
>
> I think we should use your simpler version.  There's no good reason to
> make this more complicated than it needs to be.  I haven't been able to
> find a test case where your changes get the wrong result.

Great!

> From: Brian Behlendorf <behlendorf1@...l.gov>
> Date: Thu, 5 Aug 2010 14:59:11 -0700
> Subject: [PATCH] Fix div64_u64 for 32bit platforms
>
> The current implementation of div64_u64 for 32bit systems returns
> an approximately correct result when the divisor exceeds 32bits.
> Since doing 64bit division using 32bit hardware is a long since
> solved problem we just use one of the existing proven methods.

Brian, you forgot to add your sob. Hopefully Andrew can add

	Signed-off-by: Brian Behlendorf <behlendorf1@...l.gov>

Signed-off-by: Oleg Nesterov <oleg@...hat.com>

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