From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Wed, 21 May 2008 19:25:54 +0800 From: Herbert Xu Subject: Re: [PATCH 1/4] block: use ARCH_KMALLOC_MINALIGN as the default dma pad mask Message-ID: <20080521112554.GA19558@gondor.apana.org.au> References: <20080521084700.GA18644@gondor.apana.org.au> <20080521183429O.tomof@acm.org> <20080521100529.GA19077@gondor.apana.org.au> <20080521200104C.tomof@acm.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20080521200104C.tomof@acm.org> Sender: owner-linux-mm@kvack.org Return-Path: To: FUJITA Tomonori 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 List-ID: On Wed, May 21, 2008 at 08:01:12PM +0900, FUJITA Tomonori wrote: > > Why do algorithms require alignments bigger than ARCH_KMALLOC_MINALIGN? Because the hardware may require it. For example, the VIA Padlock will fault unless the buffers are 16-byte aligned (it being an x86-32 platform). Cheers, -- Visit Openswan at http://www.openswan.org/ Email: Herbert Xu ~{PmV>HI~} Home Page: http://gondor.apana.org.au/~herbert/ PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org