From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Date: Mon, 4 Jan 2016 14:26:10 +0100 From: Peter Zijlstra Subject: Re: [PATCH v2 11/32] mips: reuse asm-generic/barrier.h Message-ID: <20160104132610.GX6344@twins.programming.kicks-ass.net> References: <1451572003-2440-1-git-send-email-mst@redhat.com> <1451572003-2440-12-git-send-email-mst@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1451572003-2440-12-git-send-email-mst@redhat.com> Sender: linux-arch-owner@vger.kernel.org Message-ID: <20160104132610.8NPSVkSbkJPyaOXGjV1YY7_qYdB2EYx_pNipcnLToo4@z> List-Archive: List-Post: To: "Michael S. Tsirkin" Cc: linux-kernel@vger.kernel.org, Arnd Bergmann , linux-arch@vger.kernel.org, Andrew Cooper , virtualization@lists.linux-foundation.org, Stefano Stabellini , Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" , David Miller , linux-ia64@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, sparclinux@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-metag@vger.kernel.org, linux-mips@linux-mips.org, x86@kernel.org, user-mode-linux-devel@lists.sourceforge.net, adi-buildroot-devel@lists.sourceforge.net, linux-sh@vger.kernel.org, linux-xtensa@linux-xtensa.org, xen-devel@lists.xenproject.org, Ralf Baechle , Ingo Molnar , Michael Ellerman , Andrey Konovalov , David Daney List-ID: 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.