From: ebiederm@xmission.com (Eric W. Biederman)
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>,
Mike Travis <travis@sgi.com>,
Christoph Lameter <clameter@sgi.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [crash, bisected] Re: [PATCH 3/4] x86_64: Fold pda into per cpu area
Date: Tue, 01 Jul 2008 20:08:13 -0700 [thread overview]
Message-ID: <m11w2dc7aa.fsf@frodo.ebiederm.org> (raw)
In-Reply-To: <486AE182.1020906@zytor.com> (H. Peter Anvin's message of "Tue, 01 Jul 2008 19:01:38 -0700")
"H. Peter Anvin" <hpa@zytor.com> writes:
> Eric W. Biederman wrote:
>>
>> For i386 since virtual address space is precious and because there were
>> concerns about putting code in __pa we actually relocate the kernel symbols
>> during load right after decompression. When we do relocations absolute
>> symbols are a killer.
>>
>
> Well, it means making it clear to the relocator if it should relocate those
> symbols or not. Since IIRC we're doing "all or nothing" relocation, the
> relative offsets are always the same, even between sections.
Yes the relative offsets stay the same. I don't remember if ld
generates useable relocations for what it figures are absolute
symbols. I remember the solution was that anything that we wanted to
relocate we would make section relative, and anything else we would
leave absolute, and that those were easy things to do.
The nasty case is that occasionally ld has a bug where it turns section
relative symbols into global symbols if there is a section without data.
I don't recall us caring in those instances.
While interesting. All of this is irrelevant until we start talking
unification between x86_63 and x86_64 as only x86_32 has this
restriction.
Eric
next prev parent reply other threads:[~2008-07-02 3:12 UTC|newest]
Thread overview: 108+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-06-04 0:30 [PATCH 0/4] percpu: Optimize percpu accesses Mike Travis
2008-06-04 0:30 ` [PATCH 1/4] Zero based percpu: Infrastructure to rebase the per cpu area to zero Mike Travis
2008-06-10 10:06 ` Ingo Molnar
2008-06-04 0:30 ` [PATCH 2/4] x86: Extend percpu ops to 64 bit Mike Travis
2008-06-10 10:04 ` Ingo Molnar
2008-06-04 0:30 ` [PATCH 3/4] x86_64: Fold pda into per cpu area Mike Travis
2008-06-04 12:59 ` Jeremy Fitzhardinge
2008-06-04 13:48 ` Mike Travis
2008-06-04 13:58 ` Jeremy Fitzhardinge
2008-06-04 14:17 ` Mike Travis
2008-06-09 23:18 ` Christoph Lameter
2008-06-05 10:22 ` [crash, bisected] " Ingo Molnar
2008-06-05 16:02 ` Mike Travis
2008-06-06 8:29 ` Jeremy Fitzhardinge
2008-06-06 13:15 ` Mike Travis
2008-06-18 5:34 ` Jeremy Fitzhardinge
2008-06-10 21:31 ` Mike Travis
2008-06-18 17:36 ` Jeremy Fitzhardinge
2008-06-18 18:17 ` Mike Travis
2008-06-18 18:33 ` Ingo Molnar
2008-06-18 19:33 ` Jeremy Fitzhardinge
[not found] ` <48596893.4040908@sgi.com>
[not found] ` <485AADAC.3070301@sgi.com>
[not found] ` <485AB78B.5090904@goop.org>
[not found] ` <485AC120.6010202@sgi.com>
[not found] ` <485AC5D4.6040302@goop.org>
[not found] ` <485ACA8F.10006@sgi.com>
[not found] ` <485ACD92.8050109@sgi.com>
2008-06-19 21:35 ` Jeremy Fitzhardinge
2008-06-19 21:54 ` Jeremy Fitzhardinge
2008-06-19 22:13 ` Mike Travis
2008-06-19 22:21 ` Jeremy Fitzhardinge
2008-06-30 17:49 ` Mike Travis
2008-06-19 22:23 ` Jeremy Fitzhardinge
[not found] ` <485BDB04.4090709@sgi.com>
2008-06-20 17:25 ` Jeremy Fitzhardinge
2008-06-20 17:48 ` Christoph Lameter
2008-06-20 18:30 ` Mike Travis
2008-06-20 18:40 ` Jeremy Fitzhardinge
2008-06-20 18:37 ` Jeremy Fitzhardinge
2008-06-20 18:51 ` Christoph Lameter
2008-06-20 19:04 ` Jeremy Fitzhardinge
2008-06-20 19:21 ` H. Peter Anvin
2008-06-20 19:43 ` Eric W. Biederman
2008-06-20 20:04 ` Mike Travis
2008-06-20 20:37 ` Christoph Lameter
2008-06-20 19:06 ` Mike Travis
2008-06-20 20:25 ` Eric W. Biederman
2008-06-20 20:55 ` Christoph Lameter
2008-06-23 16:55 ` Mike Travis
2008-06-23 17:33 ` Jeremy Fitzhardinge
2008-06-23 18:04 ` Mike Travis
2008-06-23 18:36 ` Mike Travis
2008-06-23 19:41 ` Jeremy Fitzhardinge
2008-06-24 0:02 ` Mike Travis
2008-06-30 17:07 ` Mike Travis
2008-06-30 17:18 ` H. Peter Anvin
2008-06-30 17:57 ` Mike Travis
2008-06-30 20:50 ` Eric W. Biederman
2008-06-30 21:08 ` Jeremy Fitzhardinge
2008-07-01 8:40 ` Eric W. Biederman
2008-07-01 16:27 ` Jeremy Fitzhardinge
2008-07-01 16:55 ` Mike Travis
2008-07-01 16:56 ` H. Peter Anvin
2008-07-01 17:26 ` Jeremy Fitzhardinge
2008-07-01 20:40 ` Eric W. Biederman
2008-07-01 21:10 ` Jeremy Fitzhardinge
2008-07-01 21:39 ` Eric W. Biederman
2008-07-01 21:52 ` Jeremy Fitzhardinge
2008-07-02 0:20 ` H. Peter Anvin
2008-07-02 1:15 ` Mike Travis
2008-07-02 1:32 ` Eric W. Biederman
2008-07-02 1:51 ` Mike Travis
2008-07-02 2:50 ` Eric W. Biederman
2008-07-02 1:40 ` H. Peter Anvin
2008-07-02 1:44 ` Mike Travis
2008-07-02 1:45 ` H. Peter Anvin
2008-07-02 1:55 ` Mike Travis
2008-07-02 22:50 ` Mike Travis
2008-07-03 4:34 ` Eric W. Biederman
2008-07-07 17:17 ` Mike Travis
2008-07-07 19:46 ` Eric W. Biederman
2008-07-08 18:21 ` Mike Travis
2008-07-08 23:36 ` Eric W. Biederman
2008-07-08 23:49 ` Jeremy Fitzhardinge
2008-07-09 14:39 ` Mike Travis
2008-07-25 20:06 ` Mike Travis
2008-07-25 20:12 ` Jeremy Fitzhardinge
2008-07-25 20:34 ` Mike Travis
2008-07-25 20:43 ` Jeremy Fitzhardinge
2008-07-25 21:05 ` Mike Travis
2008-07-09 14:37 ` Mike Travis
2008-07-09 22:38 ` Eric W. Biederman
2008-07-09 23:30 ` Mike Travis
2008-07-10 0:04 ` Eric W. Biederman
2008-07-02 2:01 ` H. Peter Anvin
2008-07-02 3:08 ` Eric W. Biederman [this message]
2008-07-01 21:11 ` Andi Kleen
2008-07-01 21:42 ` Eric W. Biederman
2008-07-01 18:41 ` Eric W. Biederman
2008-07-01 12:09 ` Mike Travis
2008-07-01 11:49 ` Mike Travis
2008-06-30 17:43 ` Jeremy Fitzhardinge
2008-06-04 0:30 ` [PATCH 4/4] x86: Replace xxx_pda() operations with x86_xx_percpu() Mike Travis
2008-06-09 13:03 ` Ingo Molnar
2008-06-09 16:08 ` Mike Travis
2008-06-09 17:36 ` Mike Travis
2008-06-09 18:20 ` Christoph Lameter
2008-06-09 23:29 ` Jeremy Fitzhardinge
2008-06-10 10:09 ` Ingo Molnar
2008-06-10 15:07 ` Mike Travis
2008-06-04 10:18 ` [PATCH] x86: collapse the various size-dependent percpu accessors together Jeremy Fitzhardinge
2008-06-04 10:45 ` Jeremy Fitzhardinge
2008-06-04 11:29 ` Ingo Molnar
2008-06-04 12:09 ` Jeremy Fitzhardinge
2008-06-10 17:21 ` Christoph Lameter
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