From: James Bottomley <James.Bottomley@SteelEye.com>
To: Christoph Lameter <clameter@sgi.com>
Cc: "Salyzyn, Mark" <mark_salyzyn@adaptec.com>,
Aubrey Li <aubreylee@gmail.com>, Bernhard Walle <bwalle@suse.de>,
linux-scsi@vger.kernel.org,
Andrew Morton <akpm@linux-foundation.org>,
linux-kernel@vger.kernel.org, Alan Cox <alan@lxorguk.ukuu.org.uk>
Subject: RE: [PATCH] [scsi] Remove __GFP_DMA
Date: Thu, 24 May 2007 12:15:17 -0500 [thread overview]
Message-ID: <1180026917.3692.47.camel@mulgrave.il.steeleye.com> (raw)
In-Reply-To: <Pine.LNX.4.64.0705240959310.28086@schroedinger.engr.sgi.com>
On Thu, 2007-05-24 at 10:00 -0700, Christoph Lameter wrote:
> On Thu, 24 May 2007, James Bottomley wrote:
>
> > > Going to ensure that we have a 31 bit (not 32 bit) physical address?
> >
> > No, unfortunately. Implementing kmalloc_mask() and kmalloc_dev() was
> > something I said I'd do ... about two years ago.
>
> Tell me more about these ideas.
Oh, it was this Kernel Summit presentation which discussed it
http://licensing.steeleye.com/support/papers/kernel_summit_iommu.pdf
The writeup of the session is here:
http://lwn.net/Articles/144100/
The idea was basically to match an allocation to a device mask. I was
going to do a generic implementation (which would probably kmalloc,
check the physaddr and fall back to GFP_DMA if we were unlucky) but
allow the architectures to override.
However, the majority of need (except for the aacraid like devices) was
solved by GFP_DMA32
James
next prev parent reply other threads:[~2007-05-24 17:15 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-05-21 15:15 Bernhard Walle
2007-05-22 21:44 ` Christoph Lameter
2007-05-23 2:41 ` Aubrey Li
2007-05-23 15:18 ` James Bottomley
2007-05-23 15:55 ` Robert P. J. Day
2007-05-23 16:17 ` James Bottomley
2007-05-23 19:17 ` Salyzyn, Mark
2007-05-23 19:38 ` Alan Cox
2007-05-27 19:46 ` James Bottomley
2007-05-24 13:24 ` Salyzyn, Mark
2007-05-24 14:59 ` James Bottomley
2007-05-24 17:00 ` Christoph Lameter
2007-05-24 17:15 ` James Bottomley [this message]
2007-05-24 17:22 ` Christoph Lameter
2007-05-24 17:26 ` James Bottomley
2007-05-24 16:59 ` Christoph Lameter
[not found] <fa.6bUV4KR+za7HW4tT2WBlccqvoq0@ifi.uio.no>
[not found] ` <fa.NYl60pD1cwd1ESdKNCPaOwSz1WA@ifi.uio.no>
[not found] ` <fa.hW9tQQfgwmXj0gAKQoWXOxVzpvk@ifi.uio.no>
[not found] ` <fa.xLFpJ54sTvGq6YIol2Ew31Rrq2s@ifi.uio.no>
[not found] ` <fa.JZsPKKyEKOAfxp6reMY5ZwSNjQU@ifi.uio.no>
[not found] ` <fa.txrEcCPLxIukzeVBv7UG39WubcI@ifi.uio.no>
2007-05-24 5:28 ` Robert Hancock
2007-05-24 10:08 ` Alan Cox
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