linux-kernel - Re: [PATCH] lib/int_sqrt.c: Optimize square root function

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Message-ID: <1500551569.14415.9.camel@perches.com>
Date:   Thu, 20 Jul 2017 04:52:49 -0700
From:   Joe Perches <joe@...ches.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Anshul Garg <aksgarg1989@...il.com>,
        Davidlohr Bueso <dave@...olabs.net>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        anshul.g@...sung.com, Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] lib/int_sqrt.c: Optimize square root function

On Thu, 2017-07-20 at 13:24 +0200, Peter Zijlstra wrote:
[]
> +	m = 1UL << ((fls(x) + 1) & ~1UL);

maybe 

#if BITS_PER_LONG == 64
	m = 1UL << ((fls64(x) + 1) & ~1UL);
#else
	m = 1UL << ((fls(x) + 1) & ~1UL);
#endif