linux-kernel - Re: [PATCH -v3 0/6] rcu,nohz,kvm: use RCU extended quiescent state when running KVM guest

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Message-ID: <54D95D73.3040805@redhat.com>
Date:	Mon, 09 Feb 2015 20:22:59 -0500
From:	Rik van Riel <riel@...hat.com>
To:	Will Deacon <will.deacon@....com>
CC:	"paulmck@...ux.vnet.ibm.com" <paulmck@...ux.vnet.ibm.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Catalin Marinas <Catalin.Marinas@....com>,
	"fweisbec@...il.com" <fweisbec@...il.com>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	"mtosatti@...hat.com" <mtosatti@...hat.com>,
	"borntraeger@...ibm.com" <borntraeger@...ibm.com>,
	"mingo@...nel.org" <mingo@...nel.org>,
	"oleg@...hat.com" <oleg@...hat.com>,
	"lcapitulino@...hat.com" <lcapitulino@...hat.com>,
	"pbonzini@...hat.com" <pbonzini@...hat.com>
Subject: Re: [PATCH -v3 0/6] rcu,nohz,kvm: use RCU extended quiescent state
 when running KVM guest

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On 02/09/2015 08:15 PM, Will Deacon wrote:
> Hi Rik,
> 
> On Mon, Feb 09, 2015 at 04:04:38PM +0000, riel@...hat.com wrote:
>> Apologies to Catalin and Will for not fixing up ARM. I am not 
>> familiar with ARM assembly, and not sure how to pass a constant 
>> argument to a function from assembly code on ARM :)
> 
> It's a bit of a faff getting enum values into asm -- we actually
> have to duplicate the definitions using #defines to get at the
> constants. Perhaps it would be cleaner to leave
> context_tracking_user_{enter,exit} intact as C wrappers around
> context_tracking_{enter,exit} passing the appropriate constant?
> That way we don't actually need to change the arch code at all.

If Paul and Frederic have no objections, I would be happy to do that.

Paul, Frederic?

- -- 
All rights reversed
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