linux-kernel - Re: [PATCH 01/13] md/raid6: move raid6 data processing to raid6

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Date:	Sun, 22 Mar 2009 10:22:05 -0700
From:	Dan Williams <dan.j.williams@...el.com>
To:	Andre Noll <maan@...temlinux.org>
Cc:	linux-raid@...r.kernel.org, linux-kernel@...r.kernel.org,
	neilb@...e.de, maciej.sosnowski@...el.com
Subject: Re: [PATCH 01/13] md/raid6: move raid6 data processing to raid6_pq.ko

On Thu, Mar 19, 2009 at 1:09 PM, Andre Noll <maan@...temlinux.org> wrote:
> On 12:20, Dan Williams wrote:
>> Move the raid6 data processing routines into a standalone module
>> (raid6_pq) to prepare them to be called from async_tx wrappers and other
>> non-md drivers/modules.  This precludes a circular dependency of raid456
>> needing the async modules for data processing while those modules in
>> turn depend on raid456 for the base level synchronous raid6 routines.
>>
>> To support this move:
>> 1/ The exportable definitions in raid6.h move to include/linux/raid/pq.h
>
> As raid*.h and md.h have been moved to drivers/md recently, pq.h
> should probably live there as well.

Not in this case.  pq.h is analogous to xor.h currently in
include/linux/raid/.  I.e. just the data processing symbols that are
used by modules outside of drivers/md/.

>> +#define time_before(x, y) ((x) < (y))
>
> This macro seems to have no users (and a strange name).
>

It's used a few lines down in the same file.  It allows raid6algos.c
to be compiled for the userspace test (drivers/md/raid6test/) where we
do not have jiffies.h.

Regards,
Dan
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