I understand the RAID-6 or GF(2) math. There is a test code crypto/async_tx/raid6test.c which make calls to async_gen_syncdrome() in turn calls raid6_int4_gen_syndrome(). I could not find which polynomial this code is using.
-Marri


-----Original Message-----
From: Michael Evans [mailto:mjevans1983@gmail.com] 
Sent: Monday, April 19, 2010 6:55 PM
To: Tirumala Reddy Marri
Cc: linux-raid@vger.kernel.org
Subject: Re: RAID-6 polynomial

On Mon, Apr 19, 2010 at 4:44 PM, Tirumala Reddy Marri <tmarri@amcc.com> wrote:
quoted text
> What is the default polynomial to calculate RAID-6 syndrome in
> async_pq.c? Is it 0x11d ?
> Thanks in Advance,
> Marri
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If you google "raid6 math" you'll get a result like this as the first result:

http://kernel.org/pub/linux/kernel/people/hpa/raid6.pdf The
Mathematics of Raid 6
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