linux-kernel - Re: [PATCH v8 10/10] pvqspinlock, x86: Enable qspinlock PV support for XEN

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Message-ID: <20140402143932.GA13097@phenom.dumpdata.com>
Date:	Wed, 2 Apr 2014 10:39:32 -0400
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Waiman Long <Waiman.Long@...com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Peter Zijlstra <peterz@...radead.org>,
	linux-arch@...r.kernel.org, x86@...nel.org,
	linux-kernel@...r.kernel.org,
	virtualization@...ts.linux-foundation.org,
	xen-devel@...ts.xenproject.org, kvm@...r.kernel.org,
	Paolo Bonzini <paolo.bonzini@...il.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Rik van Riel <riel@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>,
	David Vrabel <david.vrabel@...rix.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Gleb Natapov <gleb@...hat.com>,
	Aswin Chandramouleeswaran <aswin@...com>,
	Scott J Norton <scott.norton@...com>,
	Chegu Vinod <chegu_vinod@...com>
Subject: Re: [PATCH v8 10/10] pvqspinlock, x86: Enable qspinlock PV support
 for XEN

> diff --git a/kernel/Kconfig.locks b/kernel/Kconfig.locks
> index a70fdeb..451e392 100644
> --- a/kernel/Kconfig.locks
> +++ b/kernel/Kconfig.locks
> @@ -229,4 +229,4 @@ config ARCH_USE_QUEUE_SPINLOCK
>  
>  config QUEUE_SPINLOCK
>  	def_bool y if ARCH_USE_QUEUE_SPINLOCK
> -	depends on SMP && (!PARAVIRT_SPINLOCKS || !XEN)
> +	depends on SMP

If I read this correctly that means you cannot select any more the old
ticketlocks? As in, if you select CONFIG_PARAVIRT on X86 it will automatically
select ARCH_USE_QUEUE_SPINLOCK which will then enable this by default?

Should the 'def_bool' be selectable?

> -- 
> 1.7.1
> 
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