From: Tejun Heo <tj@kernel.org>
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: Paul Mackerras <paulus@samba.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Ingo Molnar <mingo@elte.hu>, Thomas Gleixner <tglx@linutronix.de>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [GIT PULL] Additional x86 fixes for 2.6.31-rc5
Date: Mon, 03 Aug 2009 10:01:19 +0900 [thread overview]
Message-ID: <4A7636DF.8090201@kernel.org> (raw)
In-Reply-To: <4A750D66.6050203@zytor.com>
Hello,
H. Peter Anvin wrote:
> You can't actually do "lea %gs:foo,%rbx" (lea doesn't include the
> segment offset, unfortunately; I asked AMD to change that on 64 bits
> but, not too surprisingly, they weren't able to make that change.)
> Getting the address is expensive, but it's obviously possible -- which
> may have similar bad results. It would be worth experimenting with a
> little bit, though.
Yeap, this part is strange. I can't understand why it was done that
way. Interestingly, the segment override doesn't trigger any
exception, it just gets ignored. Is there a way to retrieve %gs value
without accessing memory? ie. other than %gs:identity_gs?
Thanks.
--
tejun
next prev parent reply other threads:[~2009-08-03 1:01 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-07-31 18:13 [GIT PULL] Additional x86 fixes for 2.6.31-rc5 H. Peter Anvin
2009-07-31 19:45 ` Linus Torvalds
2009-07-31 19:57 ` Ingo Molnar
2009-08-01 19:28 ` Linus Torvalds
2009-08-01 19:38 ` H. Peter Anvin
2009-08-01 22:04 ` Linus Torvalds
2009-08-01 22:35 ` H. Peter Anvin
2009-08-02 1:20 ` Paul Mackerras
2009-08-02 3:52 ` H. Peter Anvin
2009-08-03 1:01 ` Tejun Heo [this message]
2009-08-03 1:14 ` Linus Torvalds
2009-08-03 1:49 ` Tejun Heo
2009-08-03 2:14 ` Linus Torvalds
2009-08-03 5:08 ` [PATCH 1/3] x86: Add 'percpu_read_stable()' interface for cacheable accesses Tejun Heo
2009-08-03 5:13 ` H. Peter Anvin
2009-08-03 5:18 ` Tejun Heo
2009-08-03 6:04 ` Ingo Molnar
2009-08-03 6:08 ` H. Peter Anvin
2009-08-03 6:16 ` Ingo Molnar
2009-08-03 7:00 ` Ingo Molnar
2009-08-03 15:13 ` [PATCH 1/3 UPDATED] x86, percpu: " Tejun Heo
2009-08-03 5:10 ` [PATCH 2/3] x86,percpu: fix DECLARE/DEFINE_PER_CPU_PAGE_ALIGNED() Tejun Heo
2009-08-03 5:12 ` [PATCH 3/3] x86: collect hot percpu variables into one cacheline Tejun Heo
2009-08-05 7:34 ` [GIT PULL] Additional x86 fixes for 2.6.31-rc5 Tan, Wei Chong
2009-08-05 8:06 ` Ingo Molnar
2009-08-10 0:42 ` Tan, Wei Chong
2009-08-10 9:05 ` Ingo Molnar
2009-08-10 15:32 ` Linus Torvalds
2009-08-10 9:06 ` [tip:x86/urgent] x86: Fix serialization in pit_expect_msb() tip-bot for Linus Torvalds
2009-08-10 18:01 ` tip-bot for Linus Torvalds
2009-08-05 23:10 ` [GIT PULL] Additional x86 fixes for 2.6.31-rc5 Tan, Wei Chong
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=4A7636DF.8090201@kernel.org \
--to=tj@kernel.org \
--cc=hpa@zytor.com \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@elte.hu \
--cc=paulus@samba.org \
--cc=tglx@linutronix.de \
--cc=torvalds@linux-foundation.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.