linux-kernel - Re: [uml-devel] SYSCALL, ptrace and syscall restart breakages (Re: [RFC] weird crap with vdso on uml/i386)

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Message-ID: <4E53FEE0.30107@zytor.com>
Date:	Tue, 23 Aug 2011 12:26:24 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	Al Viro <viro@...iv.linux.org.uk>,
	Andrew Lutomirski <luto@....edu>,
	Borislav Petkov <bp@...64.org>, Ingo Molnar <mingo@...nel.org>,
	"user-mode-linux-devel@...ts.sourceforge.net" 
	<user-mode-linux-devel@...ts.sourceforge.net>,
	Richard Weinberger <richard@....at>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"mingo@...hat.com" <mingo@...hat.com>
Subject: Re: [uml-devel] SYSCALL, ptrace and syscall restart breakages (Re:
 [RFC] weird crap with vdso on uml/i386)

On 08/23/2011 12:24 PM, Linus Torvalds wrote:
> On Tue, Aug 23, 2011 at 12:18 PM, H. Peter Anvin <hpa@...or.com> wrote:
>>
>> We could drop that information in a metaregister.  It's not backward
>> compatible, but at least it will be obvious when that information is
>> available and not.
> 
> Well, seriously, UML already looks at the word at "ip-2" for other
> reasons. So it isn't like there is any point in adding more support to
> just give you that information in another form.
> 

Not for UML, but it might be useful for other things.  Certainly lowers
the priority, though.

	-hpa


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