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Date: Thu, 25 Jan 2018 13:20:49 -0800
From: Linus Torvalds <>
To: Andy Lutomirski <>
Cc: "the arch/x86 maintainers" <>, LKML <>, 
	Greg Kroah-Hartman <>, Alan Cox <>, 
	Jann Horn <>, Samuel Neves <>, 
	Dan Williams <>, 
	Kernel Hardening <>, Borislav Petkov <>
Subject: Re: [PATCH] x86/retpoline/entry: Disable the entire SYSCALL64 fast
 path with retpolines on

On Thu, Jan 25, 2018 at 1:08 PM, Andy Lutomirski <> wrote:
> With retpoline, the retpoline in the trampoline sucks.  I don't need
> perf for that -- I've benchmarked it both ways.  It sucks.  I'll fix
> it, but it'll be kind of complicated.

Ahh, I'd forgotten about that (and obviously didn't see it in the profiles).

But yeah, that is fixable even if it does require a page per CPU. Or
did you have some clever scheme in mind?

But that's independent of the slow/fast path.


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