From: Herbert Xu <herbert@gondor.apana.org.au>
To: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Cc: akpm@linux-foundation.org, linux-scsi@vger.kernel.org,
linux-ide@vger.kernel.org, jens.axboe@oracle.com,
tsbogend@alpha.franken.de, bzolnier@gmail.com,
James.Bottomley@HansenPartnership.com, jeff@garzik.org,
davem@davemloft.net, linux-mm@kvack.org
Subject: Re: [PATCH 1/4] block: use ARCH_KMALLOC_MINALIGN as the default dma pad mask
Date: Wed, 21 May 2008 11:16:46 +0800 [thread overview]
Message-ID: <20080521031646.GA16565@gondor.apana.org.au> (raw)
In-Reply-To: <20080521103651P.fujita.tomonori@lab.ntt.co.jp>
On Wed, May 21, 2008 at 10:36:51AM +0900, FUJITA Tomonori wrote:
>
> ARCH_KMALLOC_MINALIGN represents DMA alignment since we guarantee
> kmalloced buffers can be used for DMA.
That may be why it was created, but that is not its only application.
In particular, it forms part of the calculation of the minimum
alignment guaranteed by kmalloc which is why it's used in crpyto.
Of course, if some kind soul would move this calculation into a
header file then we wouldn't be having this discussion.
Cheers,
--
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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next prev parent reply other threads:[~2008-05-21 3:16 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1211259514-9131-1-git-send-email-fujita.tomonori@lab.ntt.co.jp>
[not found] ` <1211259514-9131-2-git-send-email-fujita.tomonori@lab.ntt.co.jp>
2008-05-20 9:31 ` [PATCH 1/4] block: use ARCH_KMALLOC_MINALIGN as the default dma pad mask Andrew Morton
2008-05-20 9:38 ` Herbert Xu
2008-05-20 9:52 ` Andrew Morton
2008-05-20 9:58 ` FUJITA Tomonori
2008-05-20 11:32 ` Herbert Xu
2008-05-20 13:25 ` FUJITA Tomonori
2008-05-20 15:34 ` Herbert Xu
2008-05-20 16:09 ` FUJITA Tomonori
2008-05-21 1:26 ` Herbert Xu
2008-05-21 1:36 ` FUJITA Tomonori
2008-05-21 3:16 ` Herbert Xu [this message]
2008-05-21 6:54 ` FUJITA Tomonori
2008-05-21 8:47 ` Herbert Xu
2008-05-21 9:34 ` FUJITA Tomonori
2008-05-21 10:05 ` Herbert Xu
2008-05-21 11:01 ` FUJITA Tomonori
2008-05-21 11:25 ` Herbert Xu
2008-05-21 12:09 ` FUJITA Tomonori
2008-05-21 12:22 ` Herbert Xu
2008-05-21 12:46 ` FUJITA Tomonori
2008-05-21 12:55 ` FUJITA Tomonori
2008-05-21 13:19 ` Herbert Xu
2008-05-21 13:18 ` Herbert Xu
2008-05-22 1:14 ` FUJITA Tomonori
2008-05-22 1:19 ` David Miller, FUJITA Tomonori
2008-05-22 1:21 ` Herbert Xu
2008-05-22 1:32 ` FUJITA Tomonori
2008-05-22 1:56 ` Herbert Xu
2008-05-20 9:55 ` Paul Mundt
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