linux-kernel - Re: [PATCH v3] powerpc: spinlock: Fix spin_unlock

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Message-ID: <20160609175054.GY30154@twins.programming.kicks-ass.net>
Date:	Thu, 9 Jun 2016 19:50:54 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Michael Ellerman <mpe@...erman.id.au>
Cc:	Boqun Feng <boqun.feng@...il.com>, linuxppc-dev@...ts.ozlabs.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Will Deacon <will.deacon@....com>
Subject: Re: [PATCH v3] powerpc: spinlock: Fix spin_unlock_wait()

On Thu, Jun 09, 2016 at 10:23:28PM +1000, Michael Ellerman wrote:
> Unfortunately the patch isn't 100%.

So what I'll do; since my patch is trying to ensure all implementations
of spin_unlock_wait() provide ACQUIRE semantics, and this patch does
indeed do so, is skip touching PPC entirely and hope this patch lands
before 4.8.