Re: [PATCH v2 20/32] metag: define __smp_xxx
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- To: "Michael S. Tsirkin" <mst@xxxxxxxxxx>
- Subject: Re: [PATCH v2 20/32] metag: define __smp_xxx
- From: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
- Date: Mon, 4 Jan 2016 14:41:28 +0100
- Cc: linux-kernel@xxxxxxxxxxxxxxx, Arnd Bergmann <arnd@xxxxxxxx>, linux-arch@xxxxxxxxxxxxxxx, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx, Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, David Miller <davem@xxxxxxxxxxxxx>, linux-ia64@xxxxxxxxxxxxxxx, linuxppc-dev@xxxxxxxxxxxxxxxx, linux-s390@xxxxxxxxxxxxxxx, sparclinux@xxxxxxxxxxxxxxx, linux-arm-kernel@xxxxxxxxxxxxxxxxxxx, linux-metag@xxxxxxxxxxxxxxx, linux-mips@xxxxxxxxxxxxxx, x86@xxxxxxxxxx, user-mode-linux-devel@xxxxxxxxxxxxxxxxxxxxx, adi-buildroot-devel@xxxxxxxxxxxxxxxxxxxxx, linux-sh@xxxxxxxxxxxxxxx, linux-xtensa@xxxxxxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx, James Hogan <james.hogan@xxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Davidlohr Bueso <dbueso@xxxxxxx>, Andrey Konovalov <andreyknvl@xxxxxxxxxx>
- In-reply-to: <1451572003-2440-21-git-send-email-mst@redhat.com>
- List-id: <linux-ia64.vger.kernel.org>
- References: <1451572003-2440-1-git-send-email-mst@redhat.com> <1451572003-2440-21-git-send-email-mst@redhat.com>
- User-agent: Mutt/1.5.21 (2012-12-30)
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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