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

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Date:	Tue, 10 Feb 2015 01:15:40 +0000
From:	Will Deacon <will.deacon@....com>
To:	"riel@...hat.com" <riel@...hat.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

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.

Will
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