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

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Date:	Wed, 01 Apr 2015 10:08:50 -0400
From:	Waiman Long <waiman.long@...com>
To:	Peter Zijlstra <peterz@...radead.org>
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 04/01/2015 03:45 AM, Peter Zijlstra wrote:
> 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.

OK, if that is the case, I will embedded it in the qspinlock series.

-Longman
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