Re: virt_to_page/pci_map_page vs. pci_map_single

[David Mosberger]

>>>>> 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.

	--david
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