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From: Jes Sorensen <jes@trained-monkey.org>
To: davidm@hpl.hp.com
Cc: Jamie Wellnitz <Jamie.Wellnitz@emulex.com>, linux-kernel@vger.kernel.org
Subject: Re: virt_to_page/pci_map_page vs. pci_map_single
Date: 04 Nov 2003 04:44:36 -0500	[thread overview]
Message-ID: <yq04qxklb7f.fsf@trained-monkey.org> (raw)
In-Reply-To: <16294.53393.763572.291298@napali.hpl.hp.com>

>>>>> "David" == David Mosberger <davidm@napali.hpl.hp.com> writes:

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
Jes> well as anything you do not get back as a dynamic mapping such as
Jes> ioremap/vmalloc/kmap.

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

Mmmm good point, I stand corrected. It doesn't really make sense to do
it anyway, but maybe it's worth underlining in the doc if it hasn't
been done so already.

Cheers,
Jes

  parent reply	other threads:[~2003-11-04  9:51 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-11-02 18:12 virt_to_page/pci_map_page vs. pci_map_single Jamie Wellnitz
2003-11-03  8:10 ` Jes Sorensen
2003-11-03 12:52   ` Jamie Wellnitz
2003-11-03 14:17     ` Jes Sorensen
2003-11-03 22:02       ` David Mosberger
2003-11-04  0:41         ` David S. Miller
2003-11-04  9:44         ` Jes Sorensen [this message]
2003-11-03 18:48 James Bottomley
2003-11-03 22:03 ` Jamie Wellnitz
2003-11-04  9:48 ` Jes Sorensen
2003-11-04 16:35   ` Matt Porter
2003-11-04 16:47     ` James Bottomley
2003-11-04 17:11       ` Matt Porter
2003-11-04 16:43   ` James Bottomley
2003-11-05 16:23     ` Anton Blanchard
2003-11-06  8:28     ` Jes Sorensen
     [not found] <NuZH.1a5.7@gated-at.bofh.it>
     [not found] ` <NI6s.1MM.3@gated-at.bofh.it>
     [not found]   ` <NMtC.7Vs.21@gated-at.bofh.it>
     [not found]     ` <NNSy.1Cd.1@gated-at.bofh.it>
     [not found]       ` <NV3O.5w7.19@gated-at.bofh.it>
     [not found]         ` <NWCA.7Qv.19@gated-at.bofh.it>
2003-11-04  8:41           ` Ihar 'Philips' Filipau

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