linux-kernel - Re: [PATCH] context_tracking: Restore previous state in schedule

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Date:	Wed, 3 Dec 2014 19:30:24 -0500
From:	Dave Jones <davej@...hat.com>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Richard Guy Briggs <rgb@...hat.com>,
	Eric Paris <eparis@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Paul McKenney <paulmck@...ux.vnet.ibm.com>
Subject: Re: [PATCH] context_tracking: Restore previous state in schedule_user

On Wed, Dec 03, 2014 at 04:04:31PM -0800, Andy Lutomirski wrote:
 > On Wed, Dec 3, 2014 at 3:58 PM, Frederic Weisbecker <fweisbec@...il.com> wrote:
 > > On Wed, Dec 03, 2014 at 03:18:41PM -0800, Andy Lutomirski wrote:
 > >> It appears that some SCHEDULE_USER (asm for schedule_user) callers
 > >> in arch/x86/kernel/entry_64.S are called from RCU kernel context,
 > >> and schedule_user will return in RCU user context.  This causes RCU
 > >> warnings and possible failures.
 > >>
 > >> This is intended to be a minimal fix suitable for 3.18.
 > >>
 > >> Reported-by: Dave Jones <davej@...hat.com>
 > >> Cc: Oleg Nesterov <oleg@...hat.com>
 > >> Cc: Frédéric Weisbecker <fweisbec@...il.com>
 > >> Cc: Paul McKenney <paulmck@...ux.vnet.ibm.com>
 > >> Signed-off-by: Andy Lutomirski <luto@...capital.net>
 > >
 > > Ah, we sent it about at the same time :-)
 > >
 > > Might be too late for 3.18 though because it's not a regression.

Wait, so how come that trace didn't start showing up until recently ?

	Dave

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