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

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Date:	Tue, 06 May 2008 11:33:13 +0200
From:	Michal Simek <monstr@...nam.cz>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
CC:	Stephen Neuendorffer <stephen.neuendorffer@...inx.com>,
	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,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Microblaze: implement dma-coherent API andrefactorcache
 flush code.

Hi John, Steve and others,

I'll only rename flush to invalidate. Thant's all for now.

Michal

> 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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