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Date: Fri, 26 Jan 2018 10:13:38 -0800
From: Linus Torvalds <>
To: Al Viro <>
Cc: Andy Lutomirski <>, Alan Cox <>, 
	David Laight <>, "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

On Fri, Jan 26, 2018 at 10:07 AM, Al Viro <> wrote:
> Umm...  What about other architectures?  Or do you want SYSCALL_DEFINE...
> to be per-arch?  I wonder how much would that "go through pt_regs" hurt
> on something like sparc...

No, but I just talked to Will Deacon about register clearing on entry,
and so I suspect that arm64 might want something similar too.

So I think some opt-in for letting architectures add their own
function would be good. Because it wouldn't be all architectures, but
it probably _would_ be more than just x86.

You need to add architecture-specific "load argX from ptregs" macros anyway.


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