From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1761922AbXJaWre (ORCPT ); Wed, 31 Oct 2007 18:47:34 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1760304AbXJaWmi (ORCPT ); Wed, 31 Oct 2007 18:42:38 -0400 Received: from smtp.polymtl.ca ([132.207.4.11]:51411 "EHLO smtp.polymtl.ca" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1759733AbXJaWm1 (ORCPT ); Wed, 31 Oct 2007 18:42:27 -0400 Message-Id: <20071031224218.856492079@polymtl.ca> References: <20071031223710.099558229@polymtl.ca> User-Agent: quilt/0.46-1 Date: Wed, 31 Oct 2007 18:37:36 -0400 From: Mathieu Desnoyers To: akpm@linux-foundation.org, linux-kernel@vger.kernel.org Cc: Mathieu Desnoyers , clameter@sgi.com, sparclinux@vger.kernel.org, wli@holomorphy.com Subject: [patch 26/28] Add cmpxchg_local to sparc64 Content-Disposition: inline; filename=add-cmpxchg-local-to-sparc64.patch X-Poly-FromMTA: (dijkstra.casi.polymtl.ca [132.207.72.10]) at Wed, 31 Oct 2007 22:42:19 +0000 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Use cmpxchg_u32 and cmpxchg_u64 for cmpxchg_local and cmpxchg64_local. For other type sizes, use the new generic cmpxchg_local (disables interrupt). Change: Since the header depends on local_irqsave/local_irqrestore, it must be included after their declaration. Actually, being below the #include should be enough, and on sparc64 it is included at the beginning of system.h. So it makes sense to move it up for sparc64. Signed-off-by: Mathieu Desnoyers CC: clameter@sgi.com CC: sparclinux@vger.kernel.org CC: wli@holomorphy.com --- include/asm-sparc64/system.h | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) Index: linux-2.6-lttng/include/asm-sparc64/system.h =================================================================== --- linux-2.6-lttng.orig/include/asm-sparc64/system.h 2007-10-31 17:32:43.000000000 -0400 +++ linux-2.6-lttng/include/asm-sparc64/system.h 2007-10-31 18:31:51.000000000 -0400 @@ -9,6 +9,7 @@ #ifndef __ASSEMBLY__ #include +#include /* * Sparc (general) CPU types @@ -314,6 +315,34 @@ __cmpxchg(volatile void *ptr, unsigned l (unsigned long)_n_, sizeof(*(ptr))); \ }) +/* + * cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make + * them available. + */ + +static inline unsigned long __cmpxchg_local(volatile void *ptr, + unsigned long old, + unsigned long new, int size) +{ + switch (size) { + case 4: + case 8: return __cmpxchg(ptr, old, new, size); + default: + return __cmpxchg_local_generic(ptr, old, new, size); + } + + return old; +} + +#define cmpxchg_local(ptr, o, n) \ + ((__typeof__(*(ptr)))__cmpxchg_local((ptr), (unsigned long)(o), \ + (unsigned long)(n), sizeof(*(ptr)))) +#define cmpxchg64_local(ptr, o, n) \ + ({ \ + BUILD_BUG_ON(sizeof(*(ptr)) != 8); \ + cmpxchg_local((ptr), (o), (n)); \ + }) + #endif /* !(__ASSEMBLY__) */ #define arch_align_stack(x) (x) -- Mathieu Desnoyers Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F BA06 3F25 A8FE 3BAE 9A68