linux-kernel - Re: [PATCH tip/core/rcu 7/9] arm64: Use common outgoing-CPU-notification code

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Message-ID: <20150521132557.GK29424@e104818-lin.cambridge.arm.com>
Date:	Thu, 21 May 2015 14:25:57 +0100
From:	Catalin Marinas <catalin.marinas@....com>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	Will Deacon <will.deacon@....com>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"laijs@...fujitsu.com" <laijs@...fujitsu.com>,
	"bobby.prani@...il.com" <bobby.prani@...il.com>,
	"peterz@...radead.org" <peterz@...radead.org>,
	"fweisbec@...il.com" <fweisbec@...il.com>,
	"dvhart@...ux.intel.com" <dvhart@...ux.intel.com>,
	"oleg@...hat.com" <oleg@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"rostedt@...dmis.org" <rostedt@...dmis.org>,
	"josh@...htriplett.org" <josh@...htriplett.org>,
	"dhowells@...hat.com" <dhowells@...hat.com>,
	"edumazet@...gle.com" <edumazet@...gle.com>,
	"mathieu.desnoyers@...icios.com" <mathieu.desnoyers@...icios.com>,
	"dipankar@...ibm.com" <dipankar@...ibm.com>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"mingo@...nel.org" <mingo@...nel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH tip/core/rcu 7/9] arm64: Use common
 outgoing-CPU-notification code

On Thu, May 21, 2015 at 05:48:33AM -0700, Paul E. McKenney wrote:
> On Thu, May 21, 2015 at 09:58:06AM +0100, Will Deacon wrote:
> > On Tue, May 12, 2015 at 10:50:05PM +0100, Paul E. McKenney wrote:
> > > From: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
> > > 
> > > This commit removes the open-coded CPU-offline notification with new
> > > common code.  In particular, this change avoids calling scheduler code
> > > using RCU from an offline CPU that RCU is ignoring.  This is a minimal
> > > change.  A more intrusive change might invoke the cpu_check_up_prepare()
> > > and cpu_set_state_online() functions at CPU-online time, which would
> > > allow onlining throw an error if the CPU did not go offline properly.
> > > 
> > > Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
> > > Cc: linux-arm-kernel@...ts.infradead.org
> > > Cc: Catalin Marinas <catalin.marinas@....com>
> > > Cc: Will Deacon <will.deacon@....com>
> > > ---
> > >  arch/arm64/kernel/smp.c | 6 ++----
> > >  1 file changed, 2 insertions(+), 4 deletions(-)
> > 
> > I don't have a better idea, so:
> > 
> >   Acked-by: Will Deacon <will.deacon@....com>
> > 
> > Is this queued via -tip already, or can we pick it into the arm64 tree
> > for 4.2?
> 
> Feel free to take it into the arm64 tree.  Just let me know, and I
> will drop it from my tree.

Queued for 4.2. Thanks.

-- 
Catalin
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