From: "H. Peter Anvin" <hpa@zytor.com>
To: Eric Paris <eparis@redhat.com>, Richard Guy Briggs <rgb@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>,
linux-kernel@vger.kernel.org, przanoni@gmail.com,
mingo@kernel.org, hpa@linux.intel.com,
linux-tip-commits@vger.kernel.org, linux-audit@redhat.com
Subject: Re: [PATCH] i386/audit: stop scribbling on the stack frame
Date: Mon, 27 Oct 2014 10:02:05 -0700 [thread overview]
Message-ID: <544E7A8D.1030909@zytor.com> (raw)
In-Reply-To: <1414418157.24347.1.camel@redhat.com>
On 10/27/2014 06:55 AM, Eric Paris wrote:
> My patch was already committed to the -tip urgent branch. I believe any
> optimization should be based on that branch, Richard. If you are trying
> to wrangle every bit of speed out of this, should you
>
> push %esi;
> push %edi;
> CFI_ADJUST_CFA_OFFSET 8
> call __audit_syscall_entry
> pop;
> pop;
> CFI_ADJUST_CFA_OFFSET -8
>
> Instead of using the pushl_cfi and popl_cfi macros?
>
> I wrote my patch to be obviously correct, but agree there are certainly
> some speedups possible.
>
Uh... not only is that plain wrong (the CFI should be adjusted after
each instruction that changes the stack pointer), but what the heck is
wrong with using the macros?
-hpa
next prev parent reply other threads:[~2014-10-27 17:02 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-23 4:04 [PATCH] i386/audit: stop scribbling on the stack frame Eric Paris
2014-10-23 18:39 ` Andy Lutomirski
2014-10-23 19:13 ` H. Peter Anvin
2014-10-23 19:15 ` Eric Paris
2014-10-23 19:20 ` Andy Lutomirski
2014-10-23 19:30 ` Eric Paris
2014-10-23 19:38 ` Eric Paris
2014-10-24 20:19 ` H. Peter Anvin
2014-10-25 0:00 ` Andy Lutomirski
2014-10-27 2:06 ` Richard Guy Briggs
2014-10-23 20:30 ` Andy Lutomirski
2014-10-24 2:55 ` H. Peter Anvin
2014-10-27 2:01 ` Richard Guy Briggs
[not found] ` <tip-26c2d2b39128adba276d140eefa2745591b88536@git.kernel.org>
[not found] ` <alpine.DEB.2.11.1410251034320.5308@nanos>
2014-10-27 2:34 ` Richard Guy Briggs
2014-10-27 13:55 ` Eric Paris
2014-10-27 17:02 ` H. Peter Anvin [this message]
2014-10-27 17:29 ` Eric Paris
2014-10-28 6:30 ` Ingo Molnar
2014-10-27 17:38 ` Richard Guy Briggs
2014-10-27 21:18 ` Thomas Gleixner
2014-10-27 21:22 ` Richard Guy Briggs
2014-10-27 20:52 ` Thomas Gleixner
2014-10-27 21:13 ` Eric Paris
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