From: Jeff Garzik <jgarzik@mandrakesoft.com>
To: Jalajadevi Ganapathy <jganapat@Storage.com>
Cc: Linux-MM@kvack.org
Subject: Re: kmalloc with GFP_DMA, or get_free_pages!!!
Date: Wed, 21 Mar 2001 13:57:41 -0500 [thread overview]
Message-ID: <3AB8F9A5.FC0095FB@mandrakesoft.com> (raw)
In-Reply-To: 85256A16.0067FBE4.00@alpha2.storage.com
Jalajadevi Ganapathy wrote:
>
> I could not find that file in the Documentation directory.
It's in kernel 2.4:
> [jgarzik@rum linux_2_4]$ ls -l Documentation/DM*
> -rw-r--r-- 1 jgarzik jgarzik 15302 Mar 7 04:00 Documentation/DMA-mapping.txt
> I have one more question here. I read from a book that virt_to_phy is same
> as virt_to_bus for PCI devices. Is that True?
On some platforms yes, on some, no. Nevertheless, in kernel 2.4.x at
least, do not use virt_to_bus and virt_to_phys, use DMA mapping...
Using virt_to_bus will kill the link step on some platforms.
--
Jeff Garzik | May you have warm words on a cold evening,
Building 1024 | a full mooon on a dark night,
MandrakeSoft | and a smooth road all the way to your door.
--
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next prev parent reply other threads:[~2001-03-21 18:57 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-03-21 18:57 kmalloc with GFP_DMA, or get_free_pages!!! Jalajadevi Ganapathy
2001-03-21 18:57 ` Jeff Garzik [this message]
-- strict thread matches above, loose matches on Subject: below --
2001-03-20 19:11 Jalajadevi Ganapathy
2001-03-20 19:56 ` Jeff Garzik
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