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Date:   Wed, 20 Dec 2017 17:00:01 +0100
From:   Peter Zijlstra <>
To:     David Laight <David.Laight@...LAB.COM>
Cc:     'Crt Mori' <>, Jonathan Cameron <>,
        Ingo Molnar <>,
        Andrew Morton <>,
        Kees Cook <>,
        Rusty Russell <>,
        Ian Abbott <>,
        Larry Finger <>,
        Niklas Soderlund <>,
        Thomas Gleixner <>,
        Krzysztof Kozlowski <>,
        Masahiro Yamada <>,
        "" <>,
        "" <>,
        Joe Perches <>
Subject: Re: [PATCH v10 1/3] lib: Add strongly typed 64bit int_sqrt

On Wed, Dec 20, 2017 at 02:39:26PM +0000, David Laight wrote:

> With minor changes it ought to be possible to remove most of the
> 64bit arithmetic and shifts.
> If you care about performance then using 32 bit maths will be much faster.

Some, u64 add/sub/shift isn't exactly expensive, but yes, I also
indicated that improvement is possible. At the very least y can be made
a u32 I suppose.

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