From: Linus Torvalds <torvalds@linux-foundation.org>
To: mingo@redhat.com, hpa@zytor.com, linux-kernel@vger.kernel.org,
rostedt@goodmis.org, a.p.zijlstra@chello.nl,
torvalds@linux-foundation.org, stable@kernel.org,
tglx@linutronix.de, mingo@elte.hu
Cc: linux-tip-commits@vger.kernel.org
Subject: Re: [tip:x86/urgent] x86/nmi: Test saved %cs in NMI to determine nested NMI case
Date: Mon, 20 Feb 2012 10:03:24 -0800 [thread overview]
Message-ID: <CA+55aFxfAn9MWRgS3O5k2tqN5ys1XrhSFVO5_9ZAoZKDVgNfGA@mail.gmail.com> (raw)
In-Reply-To: <tip-45d5a1683c04be28abdf5c04c27b1417e0374486@git.kernel.org>
On Mon, Feb 20, 2012 at 3:47 AM, tip-bot for Steven Rostedt
<rostedt@goodmis.org> wrote:
> /*
> + * If %cs was not the kernel segment, then the NMI triggered in user
> + * space, which means it is definitely not nested.
> + */
> + cmp $__KERNEL_CS, 16(%rsp)
> + jne first_nmi
I don't like how you wrote 'cmp' without a size, especially with none
of the arguments then giving a size either. Usually there's a register
name or something that gives you the size, but not here.
I guess there is some default size that gas will use, but at least
some versions of gas have traditionally errored out instead of
guessing on sizes. Maybe x86-64 doesn't use those gas versions any
more, but still..
Linus
next prev parent reply other threads:[~2012-02-20 18:03 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-19 2:06 [PATCH][GIT PULL][v3.3] x86: Test saved %rip in NMI to determine nested NMI Steven Rostedt
2012-02-19 12:56 ` Ingo Molnar
2012-02-19 13:46 ` hpanvin@gmail.com
2012-02-19 13:48 ` Ingo Molnar
2012-02-19 20:34 ` Steven Rostedt
2012-02-19 20:45 ` H. Peter Anvin
2012-02-19 21:00 ` Steven Rostedt
2012-02-19 14:57 ` Steven Rostedt
2012-02-20 8:10 ` Ingo Molnar
2012-02-20 14:41 ` Steven Rostedt
2012-02-20 15:34 ` Ingo Molnar
2012-02-20 17:07 ` H. Peter Anvin
2012-02-19 21:43 ` [PATCH v2][GIT PULL][v3.3] x86: Test saved %cs " Steven Rostedt
2012-02-20 11:47 ` [tip:x86/urgent] x86/nmi: Test saved %cs in NMI to determine nested NMI case tip-bot for Steven Rostedt
2012-02-20 16:51 ` Steven Rostedt
2012-02-27 21:29 ` Greg KH
2012-02-20 18:03 ` Linus Torvalds [this message]
2012-02-20 18:26 ` Steven Rostedt
2012-02-21 22:08 ` [tip:x86/urgent] x86: Specify a size for the cmp in the NMI handler tip-bot for Steven Rostedt
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=CA+55aFxfAn9MWRgS3O5k2tqN5ys1XrhSFVO5_9ZAoZKDVgNfGA@mail.gmail.com \
--to=torvalds@linux-foundation.org \
--cc=a.p.zijlstra@chello.nl \
--cc=hpa@zytor.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-tip-commits@vger.kernel.org \
--cc=mingo@elte.hu \
--cc=mingo@redhat.com \
--cc=rostedt@goodmis.org \
--cc=stable@kernel.org \
--cc=tglx@linutronix.de \
/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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).