linux-kernel - Re: [PATCH] xen/spinlock: Don't enable them unconditionally.

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Date:	Mon, 7 Apr 2014 18:14:27 +0100
From:	David Vrabel <david.vrabel@...rix.com>
To:	<konrad@...nel.org>
CC:	<xen-devel@...ts.xenproject.org>, <linux-kernel@...r.kernel.org>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Steven Rostedt <rostedt@...dmis.org>, <stable@...r.kernel.org>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>
Subject: Re: [PATCH] xen/spinlock: Don't enable them unconditionally.

On 04/04/14 19:48, konrad@...nel.org wrote:
> From: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
> 
> The git commit a945928ea2709bc0e8e8165d33aed855a0110279
> ('xen: Do not enable spinlocks before jump_label_init() has executed')
> was added to deal with the jump machinery. Earlier the code
> that turned on the jump label was only called by Xen specific
> functions. But now that it had been moved to the initcall machinery
> it gets called on Xen, KVM, and baremetal - ouch!. And the detection
> machinery to only call it on Xen wasn't remembered in the heat
> of merge window excitement.
> 
> This means that the slowpath is enabled on baremetal while it should
> not be.

Applied to devel/for-linus-3.15.

Thanks.

David
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