Re: virt_to_page/pci_map_page vs. pci_map_single

From: David Mosberger
Date: Mon Nov 03 2003 - 17:04:28 EST

>>>>> On 03 Nov 2003 09:17:59 -0500, Jes Sorensen <jes@xxxxxxxxxxxxxxxxxx> said:

>>>>> "Jamie" == Jamie Wellnitz <Jamie.Wellnitz@xxxxxxxxxx> writes:
Jamie> On Mon, Nov 03, 2003 at 03:10:46AM -0500, Jes Sorensen wrote:
>>> virt_to_page() can handle any page in the standard kernel region

Jamie> What is the "standard kernel region"? ZONE_NORMAL?

Jes> Hmmm, my brain has gotten ia64ified ;-) It's basically the normal
Jes> mappings of the kernel, ie. the kernel text/data/bss segments as well
Jes> as anything you do not get back as a dynamic mapping such as
Jes> ioremap/vmalloc/kmap.

I don't think it's safe to use virt_to_page() on static kernel
addresses (text, data, and bss). For example, ia64 linux nowadays
uses a virtual mapping for the static kernel memory, so it's not part
of the identity-mapped segment.

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