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Date: Thu, 23 Jun 2016 12:09:53 -0700
From: Andy Lutomirski <>
To: Peter Zijlstra <>
Cc: Linus Torvalds <>, Oleg Nesterov <>, 
	Andy Lutomirski <>, "the arch/x86 maintainers" <>, 
	Linux Kernel Mailing List <>, 
	"" <>, Borislav Petkov <>, 
	Nadav Amit <>, Kees Cook <>, 
	Brian Gerst <>, 
	"" <>, Josh Poimboeuf <>, 
	Jann Horn <>, Heiko Carstens <>
Subject: Re: [PATCH v3 00/13] Virtually mapped stacks with guard pages (x86, core)

On Thu, Jun 23, 2016 at 11:53 AM, Peter Zijlstra <> wrote:
> On Thu, Jun 23, 2016 at 10:52:58AM -0700, Linus Torvalds wrote:
>> Ugh. Looking around at this, it turns out that a great example of this
>> kind of legacy issue is the debug_mutex stuff.
>> It uses "struct thread_info *" as the owner pointer, and there is _no_
>> existing reason for it. In fact, in every single place it actually
>> wants the task_struct, and it does task_thread_info(task) just to
>> convert it to the thread-info, and then converts it back with
>> "ti->task".
>> So the attached patch seems to be the right thing to do regardless of
>> this whole discussion.
> Yeah, that looks fine. Want me to take it or will you just commit?

PeterZ, mind if I split it into a couple of patches, test it, and add
it to my series?


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