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Date: Thu, 23 Jun 2016 20:55:56 +0200
From: Peter Zijlstra <>
To: Oleg Nesterov <>
Cc: Linus Torvalds <>,
	Andy Lutomirski <>,
	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,

On Thu, Jun 23, 2016 at 08:12:16PM +0200, Oleg Nesterov wrote:
> And probably kill task_struct->blocked_on? I do not see the point of
> this task->blocked_on != waiter check.

I think that came about because of PI and or deadlock detection. Of
course, the current mutex code doesn't have anything like that these
days, and rt_mutex has task_struct::pi_blocked_on.

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