linux-kernel - Re: [PATCH 0/3] Update LZO compression

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Message-ID: <507CA000.5040905@oberhumer.com>
Date:	Tue, 16 Oct 2012 01:45:04 +0200
From:	"Markus F.X.J. Oberhumer" <markus@...rhumer.com>
To:	cover.1349621096.git.markus@...rhumer.co
CC:	Seth Jennings <sjenning@...ux.vnet.ibm.com>,
	Robert Jennings <rcj@...ux.vnet.ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Andi Kleen <andi@...stfloor.org>,
	Johannes Stezenbach <js@...21.net>,
	Richard Weinberger <richard.weinberger@...il.com>
Subject: Re: [PATCH 0/3] Update LZO compression

On 2012-10-15 21:19, Seth Jennings wrote:
>> As requested by akpm I am sending my "lzo-update" branch at
>>
>>   git://github.com/markus-oberhumer/linux.git lzo-update
>>
>> to lkml as a patch series created by "git format-patch -M v3.5..lzo-update".
>>
>> You can also browse the branch at
>>
>>   https://github.com/markus-oberhumer/linux/compare/lzo-update
>>
>> and review the three patches at
>>
>>   https://github.com/markus-oberhumer/linux/commit/7c979cebc0f93dc692b734c12665a6824d219c20
>>   https://github.com/markus-oberhumer/linux/commit/10f6781c8591fe5fe4c8c733131915e5ae057826
>>   https://github.com/markus-oberhumer/linux/commit/5f702781f158cb59075cfa97e5c21f52275057f1
> 
> As this relates to my work on zcache, I just tested these patches on PPC64 and
> they cause the LZO crypto module to fail its self-test:
> 
> [    0.521137] alg: comp: Compression test 1 failed for lzo-generic: output len = 62
> 
> I built the exact same kernel for x86_64 and all is fine.  I suspect an endianness
> related bug, but I haven't looked at the code that closely yet.
> 
> Any ideas?  I'd be happy to test any potential fixes.

The crypto LZO test vectors had to be updated - this should land in linux-next
soon (or you can just pull from my branch).

BTW, this cannot have worked on x86_64 (or any other arch), so you probably
tested the wrong kernel.

Cheers,
Markus

> Seth

-- 
Markus Oberhumer, <markus@...rhumer.com>, http://www.oberhumer.com/
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