linux-kernel - Re: [PATCH v6 1/3] lib: Add strongly typed 64bit int

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Message-ID: <20171219132522.etacjnltyrc3xjks@hirez.programming.kicks-ass.net>
Date:   Tue, 19 Dec 2017 14:25:22 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Crt Mori <cmo@...exis.com>
Cc:     Jonathan Cameron <jic23@...nel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Kees Cook <keescook@...omium.org>,
        Rusty Russell <rusty@...tcorp.com.au>,
        Ian Abbott <abbotti@....co.uk>,
        Larry Finger <Larry.Finger@...inger.net>,
        Niklas Soderlund <niklas.soderlund+renesas@...natech.se>,
        Thomas Gleixner <tglx@...utronix.de>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        linux-kernel@...r.kernel.org, Linux Iio <linux-iio@...r.kernel.org>
Subject: Re: [PATCH v6 1/3] lib: Add strongly typed 64bit int_sqrt

On Tue, Dec 19, 2017 at 10:31:18AM +0100, Crt Mori wrote:
> IIO kernel does not have the recent version in, so thanks for heads

IIO?

> up. It does not change much for my function.

The comment says:

 * Computes: floor(sqrt(x))

floor(sqrt(2^64-1)) == 2^32-1