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Date: Fri, 26 Jan 2018 14:24:07 +0000
From: Alan Cox <>
To: David Laight <David.Laight@...LAB.COM>, 'Andy Lutomirski'
 <>,  Linus Torvalds <>
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

> NetBSD (and the other BSD?) defines a structure for the arguments to
> each syscall.

Goes back to v7 or so but they put the syscall arguments into the uarea
so that no pointers were needed (uarea being a per process mapping at a
fixed address) in order to also reduce pointer dereferencing costs (not
that those matter much on modern processors)


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