netdev - Re: [PATCH 0/3] virtio/vringh: kill off ACCESS

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Message-ID: <20161125124404.GI3174@twins.programming.kicks-ass.net>
Date:   Fri, 25 Nov 2016 13:44:04 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Mark Rutland <mark.rutland@....com>
Cc:     Christian Borntraeger <borntraeger@...ibm.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        linux-kernel@...r.kernel.org, dave@...olabs.net, dbueso@...e.de,
        dvyukov@...gle.com, jasowang@...hat.com, kvm@...r.kernel.org,
        netdev@...r.kernel.org, paulmck@...ux.vnet.ibm.com,
        virtualization@...ts.linux-foundation.org,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH 0/3] virtio/vringh: kill off ACCESS_ONCE()

On Fri, Nov 25, 2016 at 01:40:44PM +0100, Peter Zijlstra wrote:
> #define SINGLE_LOAD(x)						\
> {(								\
> 	compiletime_assert_atomic_type(typeof(x));		\

Should be:

	compiletime_assert_atomic_type(x);

> 	WARN_SINGLE_COPY_ALIGNMENT(&(x));			\
> 	READ_ONCE(x);						\
> })
> 
> #define SINGLE_STORE(x, v)					\
> ({								\
> 	compiletime_assert_atomic_type(typeof(x));		\

idem

> 	WARN_SINGLE_COPY_ALIGNMENT(&(x));			\
> 	WRITE_ONCE(x, v);					\
> })