linux-kernel - Re: [PATCH] bitmap: speedup in bitmap_find_free

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Date:	Mon, 08 Apr 2013 14:35:22 -0700
From:	Joe Perches <joe@...ches.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Chanho Min <chanho.min@....com>,
	Nadia Yvette Chambers <nyc@...omorphy.com>,
	Jiri Kosina <jkosina@...e.cz>,
	Guennadi Liakhovetski <lg@...x.de>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] bitmap: speedup in bitmap_find_free_region when order
 is 0

On Mon, 2013-04-08 at 14:30 -0700, Andrew Morton wrote:
> On Mon,  8 Apr 2013 11:23:48 +0900 Chanho Min <chanho.min@....com> wrote:
> > --- a/lib/bitmap.c
[]
> > +static int __bitmap_find_free_one(unsigned long *bitmap, int bits)
[]
> > +	unsigned long mask = (unsigned long)(~((unsigned long) 0));
> 
> That seems unnecessarily complicated.  "unsigned long mask = -1;" works :)

So would ULONG_MAX or just ~0UL


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