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Re: [Xen-devel] [PATCH v2 11/32] mips: reuse asm-generic/barrier.h
- To: "Michael S. Tsirkin" <mst@xxxxxxxxxx>
- From: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
- Date: Mon, 4 Jan 2016 14:26:10 +0100
- Cc: linux-mips@xxxxxxxxxxxxxx, linux-ia64@xxxxxxxxxxxxxxx, linux-sh@xxxxxxxxxxxxxxx, virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx, "H. Peter Anvin" <hpa@xxxxxxxxx>, sparclinux@xxxxxxxxxxxxxxx, Ingo Molnar <mingo@xxxxxxxxxx>, linux-arch@xxxxxxxxxxxxxxx, linux-s390@xxxxxxxxxxxxxxx, Arnd Bergmann <arnd@xxxxxxxx>, Michael Ellerman <mpe@xxxxxxxxxxxxxx>, x86@xxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx, Ingo Molnar <mingo@xxxxxxx>, linux-xtensa@xxxxxxxxxxxxxxxx, user-mode-linux-devel@xxxxxxxxxxxxxxxxxxxxx, Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>, Andrey Konovalov <andreyknvl@xxxxxxxxxx>, adi-buildroot-devel@xxxxxxxxxxxxxxxxxxxxx, David Daney <ddaney.cavm@xxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, linux-metag@xxxxxxxxxxxxxxx, linux-arm-kernel@xxxxxxxxxxxxxxxxxxx, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, Ralf Baechle <ralf@xxxxxxxxxxxxxx>, linuxppc-dev@xxxxxxxxxxxxxxxx, David Miller <davem@xxxxxxxxxxxxx>
- Delivery-date: Mon, 04 Jan 2016 13:26:39 +0000
- List-id: Xen developer discussion <xen-devel.lists.xen.org>
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.
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