linux-kernel - Re: [RFC v2 3/6] irq: bypass: Extend skeleton for ARM forwarding control

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Date:	Tue, 07 Jul 2015 09:10:36 +0200
From:	Eric Auger <eric.auger@...aro.org>
To:	Paolo Bonzini <pbonzini@...hat.com>, eric.auger@...com,
	linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
	kvm@...r.kernel.org, christoffer.dall@...aro.org,
	marc.zyngier@....com, alex.williamson@...hat.com,
	avi.kivity@...il.com, mtosatti@...hat.com, feng.wu@...el.com,
	joro@...tes.org, b.reynal@...tualopensystems.com
CC:	linux-kernel@...r.kernel.org, patches@...aro.org
Subject: Re: [RFC v2 3/6] irq: bypass: Extend skeleton for ARM forwarding
 control

On 07/06/2015 07:41 PM, Paolo Bonzini wrote:
> 
> 
> On 06/07/2015 19:09, Eric Auger wrote:
>>>> The good thing is that this helps a bit forming a lock hierarchy across
>>>> the subsystems, for example irq bypass mutex outside vfio_platform_irq
>>>> spinlock, because you cannot have a spinlock inside the mutex.  I think
>>>> that all of your six callbacks are fine.
>> arghh, no that's wrong then. I have plenty of them in the KVM/arm vgic
>> part :-(
> 
> I checked and it's right...
> 
> /me rereads
> 
> AAAARGH.  You cannot have a mutex inside a spinlock.  What you're doing
> is fine.
Sweated up (+ heat wave in France). Was about to read again the
"concurrency and race conditions" chapter of the linux driver bible.
Might be worth anyway ;-)

Many thanks for the review

Eric
> 
> Paolo
> 

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