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Date:	Mon, 16 Jun 2014 15:00:53 -0700
From:	Andy Lutomirski <>
To:	"H. Peter Anvin" <>
Cc:	Richard Weinberger <>, X86 ML <>,
	Toralf Förster <>,
	Eric Paris <>,
	Linux Kernel <>
Subject: Re: 3.15: kernel BUG at kernel/auditsc.c:1525!

On Mon, Jun 16, 2014 at 2:58 PM, H. Peter Anvin <> wrote:
>> For 64-bit, I want to do this instead:
>> I see no reason why the 64-bit badsys code needs its own code path at
>> all.  I haven't sent it yet because AFAICT it doesn't fix any bug, and
>> the series it's a part of isn't ready.
>> I'm also contemplating rewriting the 64-bit syscall entry work path in C.
> Cute... although it still leaves an extra branch for the badsys.  It
> might perform better than a cmov, but it might not.

I bet that the branch is faster in most cases -- I'd be somewhat
surprised if CPUs can speculate through a cmov, and that value is
needed for control flow almost immediately.

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