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Date:   Mon, 4 Jan 2016 14:26:10 +0100
From:   Peter Zijlstra <peterz@infradead.org>
To:     "Michael S. Tsirkin" <mst@redhat.com>
Cc:     linux-kernel@vger.kernel.org, Arnd Bergmann <arnd@arndb.de>,
        linux-arch@vger.kernel.org,
        Andrew Cooper <andrew.cooper3@citrix.com>,
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        xen-devel@lists.xenproject.org, Ralf Baechle <ralf@linux-mips.org>,
        Ingo Molnar <mingo@kernel.org>,
        Michael Ellerman <mpe@ellerman.id.au>,
        Andrey Konovalov <andreyknvl@google.com>,
        David Daney <ddaney.cavm@gmail.com>
Subject: Re: [PATCH v2 11/32] mips: reuse asm-generic/barrier.h
Message-ID: <20160104132610.GX6344@twins.programming.kicks-ass.net>
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On Thu, Dec 31, 2015 at 09:07:10PM +0200, Michael S. Tsirkin wrote:
> -#define smp_store_release(p, v)						\
> -do {									\
> -	compiletime_assert_atomic_type(*p);				\
> -	smp_mb();							\
> -	WRITE_ONCE(*p, v);						\
> -} while (0)
> -
> -#define smp_load_acquire(p)						\
> -({									\
> -	typeof(*p) ___p1 = READ_ONCE(*p);				\
> -	compiletime_assert_atomic_type(*p);				\
> -	smp_mb();							\
> -	___p1;								\
> -})

David Daney wanted to use fancy new MIPS barriers to provide better
implementations of this.

This patch isn't in the way of that, just a FYI.