linux-kernel - Re: [PATCH] lfsr: a simple binary Galois linear feedback shift register

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Message-ID: <20150401074550.GU27490@worktop.programming.kicks-ass.net>
Date:	Wed, 1 Apr 2015 09:45:50 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Waiman Long <Waiman.Long@...com>
Cc:	Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
	Shuah Khan <shuahkh@....samsung.com>,
	Scott J Norton <scott.norton@...com>,
	Douglas Hatch <doug.hatch@...com>
Subject: Re: [PATCH] lfsr: a simple binary Galois linear feedback shift
 register

On Tue, Mar 31, 2015 at 01:28:09PM -0400, Waiman Long wrote:
> This patch is based on the code sent out by Peter Zijstra as part
> of his queue spinlock patch to provide a hashing function with open
> addressing.  The lfsr() function can be used to return a sequence of
> numbers that cycle through all the bit patterns (2^n -1) of a given
> bit width n except the value 0 in a somewhat random fashion depending
> on the LFSR tap that is being used.
> 
> This code should be a standalone patch and not part of a larger
> patch series. 

Yeah, except we don't merge code without users, which is why such stuff
typically gets a lift on the larger series you mention.
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