Re: [PATCH v2 20/32] metag: define __smp_xxx

From	Peter Zijlstra <peterz@infradead.org>
Newsgroups	linux.kernel
Subject	Re: [PATCH v2 20/32] metag: define __smp_xxx
Date	2016-01-04 14:50 +0100
Message-ID	<qNdGi-48u-15@gated-at.bofh.it> (permalink)
References	<qLQLL-8pu-3@gated-at.bofh.it> <qLQLL-8pu-13@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On Thu, Dec 31, 2015 at 09:08:22PM +0200, Michael S. Tsirkin wrote:
> +#ifdef CONFIG_SMP
> +#define fence() metag_fence()
> +#else
> +#define fence()		do { } while (0)
>  #endif

James, it strikes me as odd that fence() is a no-op instead of a
barrier() for UP, can you verify/explain?
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Re: [PATCH v2 20/32] metag: define __smp_xxx Peter Zijlstra <peterz@infradead.org> - 2016-01-04 14:50 +0100
  Re: [PATCH v2 20/32] metag: define __smp_xxx James Hogan <james.hogan@imgtec.com> - 2016-01-04 16:30 +0100
    Re: [PATCH v2 20/32] metag: define __smp_xxx Peter Zijlstra <peterz@infradead.org> - 2016-01-04 16:40 +0100
      Re: [PATCH v2 20/32] metag: define __smp_xxx James Hogan <james.hogan@imgtec.com> - 2016-01-04 17:10 +0100

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