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Date:	Sat, 12 Jul 2014 20:37:48 +0200
From:	Andi Kleen <>
To:	Andy Lutomirski <>
Cc:	Linus Torvalds <>,
	"" <>,
	Andi Kleen <>,
	"H. Peter Anvin" <>,
	Al Viro <>,
	the arch/x86 maintainers <>
Subject: Re: [PATCH 2/2] x86_64,signal: Remove 'fs' and 'gs' from sigcontext

> This seems like it's asking for trouble.  I think wxe'd have to
> separately save the selectors and the base registers to avoid breaking
> something, especially once wrgsbase, etc are enabled.

I agree, it would likely break existing code.

> Linus, for context, the other patch in this series saves and restores
> SS. 

> Without that, 64-bit sigreturn to a nondefault stack segment is
> basically impossible.  

Why would you ever want to do that?

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