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Date:	Sat, 12 Jul 2014 11:40:03 -0700
From:	"H. Peter Anvin" <>
To:	Andi Kleen <>,
	Andy Lutomirski <>
CC:	Linus Torvalds <>,
	"" <>,
	Al Viro <>,
	the arch/x86 maintainers <>
Subject: Re: [PATCH 2/2] x86_64,signal: Remove 'fs' and 'gs' from sigcontext

Because you are doing something weird (like Pin, for example) and take an asynchronous fault?

On July 12, 2014 11:37:48 AM PDT, Andi Kleen <> wrote:
>> This seems like it's asking for trouble.  I think wxe'd have to
>> separately save the selectors and the base registers to avoid
>> 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?

Sent from my mobile phone.  Please pardon brevity and lack of formatting.
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