From: "Ihar 'Philips' Filipau" <filia@softhome.net>
To: "David S. Miller" <davem@redhat.com>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
David Mosberger <davidm@napali.hpl.hp.com>,
Jes Sorensen <jes@wildopensource.com>
Subject: Re: virt_to_page/pci_map_page vs. pci_map_single
Date: Tue, 04 Nov 2003 09:41:33 +0100 [thread overview]
Message-ID: <3FA7663D.7060509@softhome.net> (raw)
In-Reply-To: <NWCA.7Qv.19@gated-at.bofh.it>
Hi!
Can any-one draw a conclusion?
Which function should be used in which case?
So this will be at least reflected in lkml archives ;-)
David S. Miller wrote:
> On Mon, 3 Nov 2003 14:02:57 -0800
> David Mosberger <davidm@napali.hpl.hp.com> wrote:
>
>
>>>>>>>On 03 Nov 2003 09:17:59 -0500, Jes Sorensen <jes@wildopensource.com> said:
>>
>> 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.
>
>
> That's correct and it'll break on sparc64 for similar reasons.
>
> It's also not safe to do virt_to_page() on kernel stack addresses
> either.
>
--
Ihar 'Philips' Filipau / with best regards from Saarbruecken.
-- _ _ _
"... and for $64000 question, could you get yourself |_|*|_|
vaguely familiar with the notion of on-topic posting?" |_|_|*|
-- Al Viro @ LKML |*|*|*|
next parent reply other threads:[~2003-11-04 8:42 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
[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 [this message]
2003-11-03 18:48 virt_to_page/pci_map_page vs. pci_map_single 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
-- strict thread matches above, loose matches on Subject: below --
2003-11-02 18:12 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
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