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Date:	Fri, 9 Oct 2015 12:24:11 +0200
From:	Paolo Bonzini <>
To:	Peter Zijlstra <>
Cc:	Kosuke Tatsukawa <>,
	Gleb Natapov <>,
	"" <>,
	"" <>
Subject: Re: [PATCH] kvm: fix waitqueue_active without memory barrier in

On 09/10/2015 10:50, Peter Zijlstra wrote:
> Not having actually read or thought about the issue at hand, its
> perfectly valid to pair an smp_mb() with either spin_lock() or
> spin_unlock().
> IOW. MB <-> {ACQUIRE, RELEASE} is a valid pairing.

In this case it's an smp_mb() (store-load barrier) being paired with
another smp_mb(), so spin_unlock()'s release is not enough.

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