linux-kernel - Re: [PATCH 03/13] scsi: unify allocation of scsi command and sense buffer

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Message-ID: <aday6sk8wne.fsf@cisco.com>
Date:	Mon, 25 May 2009 18:45:25 -0700
From:	Roland Dreier <rdreier@...co.com>
To:	Boaz Harrosh <bharrosh@...asas.com>
Cc:	Jens Axboe <jens.axboe@...cle.com>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	chris.mason@...cle.com, david@...morbit.com, hch@...radead.org,
	akpm@...ux-foundation.org, jack@...e.cz,
	yanmin_zhang@...ux.intel.com
Subject: Re: [PATCH 03/13] scsi: unify allocation of scsi command and sense buffer

 > Ideally there should be a MACRO that is defined to WORD_SIZE on cache-coherent
 > ARCHs and to SMP_CACHE_BYTES on none-cache-coherent systems and use that size
 > at the __align() attribute. (So only stupid ARCHES get hurt)

this seems to come up repeatedly -- I had a proposal a _long_ time ago
that never quite got merged, cf http://lwn.net/Articles/2265/ and
http://lwn.net/Articles/2269/ -- from 2002 (!?).  The idea is to go a
step further and create a __dma_buffer annotation for structure members.

Maybe I should resurrect that work one more time?

 - R.
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