linux-kernel - RE: [PATCH] Microblaze: implement dma-coherent API andrefactorcache flush code.

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Message-ID: <Pine.LNX.4.64.0805060923100.3160@anakin>
Date:	Tue, 6 May 2008 09:23:38 +0200 (CEST)
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Stephen Neuendorffer <stephen.neuendorffer@...inx.com>
cc:	John Williams <john.williams@...alogix.com>, arnd@...db.de,
	linux-arch@...r.kernel.org, John Linn <linnj@...inx.com>,
	matthew@....cx, will.newton@...il.com, drepper@...hat.com,
	microblaze-uclinux@...e.uq.edu.au, grant.likely@...retlab.ca,
	Michal Simek <monstr@...str.eu>, linux-kernel@...r.kernel.org
Subject: RE: [PATCH] Microblaze: implement dma-coherent API andrefactorcache
 flush code.

On Mon, 5 May 2008, Stephen Neuendorffer wrote:
> > -----Original Message-----
> > From: John Williams [mailto:john.williams@...alogix.com]
> > 
> > Sure - what I meant is can dma_alloc just call kmalloc to do it's
> work?
> 
> I scanned through Linux Device Drivers, and it appears that calling
> get_free_pages is:
> 1) more efficient than kmalloc for large allocations
> 2) allocates physically contiguous memory, which kmalloc doesn't
> necessarily do if there's an mmu.

kmalloc() allocates physically contiguous memory, vmalloc() doesn't.

Gr{oetje,eeting}s,

						Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
							    -- Linus Torvalds
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