linux-kernel - Re: [PATCH 3/4] x86_64 ia32 syscall audit fast-path

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Date:	Mon, 21 Jul 2008 16:54:19 -0700 (PDT)
From:	Roland McGrath <roland@...hat.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Alexander Viro <aviro@...hat.com>,
	Eric Paris <eparis@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/4] x86_64 ia32 syscall audit fast-path

> do you have a delta patch against tip/x86/audit-speedup by any chance? 
> That is a topic branch of your previous drop, which got tested as well 
> to a certain degree. Would make it easier to see what changed, would 
> make the merge have a more nuanced history, etc.
> 
> or, alternatively, if you have a -git based branch that i could pull, 
> that would be nice as well. (i can compare old-x86/audit-speedup to 
> new-x86/audit-speedup.)

Here is a GIT branch with freshly-rebased patches from today's upstream.
There was some merging fixup to be done after the x86/step changes went in.

I don't think it's useful to have a history merged upstream that includes
the original broken 3/4 patch.  The newer version both has the straight
line paths Linus wanted, and works right on AMD.  If we had the old version
in GIT, then there would be a point in the history that builds a kernel
that's broken for all 32-bit processes on 64-bit AMD hardware.  Anyone
doing a bisect in the future could get unlucky hit that along the way, etc.
Anyway, you'd have to redo this merging work with x86/step just to get one
that builds now.

The following changes since commit 93ded9b8fd42abe2c3607097963d8de6ad9117eb:
  Linus Torvalds (1):
        Merge git://git.kernel.org/.../gregkh/usb-2.6

are available in the git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/frob/linux-2.6-roland.git x86/auditsc

Roland McGrath (4):
      x86_64: remove bogus optimization in sysret_signal
      x86_64 syscall audit fast-path
      x86_64 ia32 syscall audit fast-path
      i386 syscall audit fast-path

 arch/x86/ia32/ia32entry.S  |   78 +++++++++++++++++++++++++++++++++++++++++--
 arch/x86/kernel/entry_32.S |   48 ++++++++++++++++++++++++++-
 arch/x86/kernel/entry_64.S |   49 +++++++++++++++++++++++++---
 kernel/auditsc.c           |    3 +-
 4 files changed, 166 insertions(+), 12 deletions(-)


Thanks,
Roland
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