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Date: Tue, 23 Jan 2018 18:36:54 +0000
From: Alan Cox <>
To: Linus Torvalds <>, Andy Lutomirski
Cc: the arch/x86 maintainers <>, LKML
 <>, Greg Kroah-Hartman
 <>,  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

> And if we ever get CPU's that have this all fixed, we can re-visit
> introducing the fastpath. But this is all very messy and it doesn't
> seem worth it right now.

We already have CPUs it doesn't affect - older Atom for one and I
believe some or all of the VIA ones (still trying to get a definitive


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