From: Roland Dreier <rdreier@cisco.com>
To: vb <vb@vsbe.com>
Cc: linuxppc-embedded@ozlabs.org
Subject: Re: Allocating uncached memory in 2.6.25(powerpc/440)
Date: Fri, 19 Sep 2008 15:09:35 -0700 [thread overview]
Message-ID: <ada1vzfaiu8.fsf@cisco.com> (raw)
In-Reply-To: <f608b67d0809191456p7193a0bfh3529d9241a304301@mail.gmail.com> (vb@vsbe.com's message of "Fri, 19 Sep 2008 14:56:11 -0700")
> basically, a block of contiguous memory is allocated. This block is
> needed to set up some DMA descriptors, so it needs to be uncached, and
> I thought this is what GFP_DMA flag is for.
No, GFP_DMA doesn't have that meaning. To allocate uncached memory, use
dma_alloc_coherent().
- R.
prev parent reply other threads:[~2008-09-19 22:09 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-09-19 21:47 Allocating uncached memory in 2.6.25(powerpc/440) vb
2008-09-19 21:56 ` vb
2008-09-19 22:09 ` Roland Dreier [this message]
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