linux-kernel - Re: [PATCH 11/13] Core Resource Allocation

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Message-ID: <adaslgim2tt.fsf@cisco.com>
Date:	Fri, 17 Nov 2006 08:54:06 -0800
From:	Roland Dreier <rdreier@...co.com>
To:	Steve Wise <swise@...ngridcomputing.com>
Cc:	openib-general@...nib.org, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH  11/13] Core Resource Allocation

 > +static u32 next_random(u32 rand)
 > +{
 > +	u32 y, ylast;
 > +
 > +	y = rand;	
 > +	ylast = y;
 > +	y = (y * 69069) & 0xffffffff;
 > +	y = (y & 0x80000000) + (ylast & 0x7fffffff);
 > +	if ((y & 1))
 > +		y = ylast ^ (y > 1) ^ (2567483615UL);
 > +	else
 > +		y = ylast ^ (y > 1);
 > +	y = y ^ (y >> 11);
 > +	y = y ^ ((y >> 7) & 2636928640UL);
 > +	y = y ^ ((y >> 15) & 4022730752UL);
 > +	y = y ^ (y << 18);
 > +	return y;
 > +}

How about just using the kernel's random32()?

I haven't read the code really so I don't understand what's being
randomized here, but random32() should be more than good enough for a
typical randomized algorithm().

 - R.
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