Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1762017AbYFDUen (ORCPT ); Wed, 4 Jun 2008 16:34:43 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754613AbYFDUec (ORCPT ); Wed, 4 Jun 2008 16:34:32 -0400 Received: from relay1.sgi.com ([192.48.171.29]:42063 "EHLO relay.sgi.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752201AbYFDUeb (ORCPT ); Wed, 4 Jun 2008 16:34:31 -0400 To: linux-kernel@vger.kernel.org Subject: [PATCH 1/1] x86 atomic operations: atomic_or_long atomic_inc_short Cc: jeremy@goop.org, mingo@elte.hu Message-Id: From: Cliff Wickman Date: Wed, 04 Jun 2008 15:33:17 -0500 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1733 Lines: 61 From: Cliff Wickman Provide atomic operations for increment of a 16-bit integer and logical OR into a 64-bit integer. [ This patch was split off of patch: SGI UV: TLB shootdown using broadcast assist unit and improved with advice from Jeremy Fitzhardinge ] Diffed against 2.6.26-rc4 Signed-off-by: Cliff Wickman --- include/asm-x86/atomic_64.h | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) Index: linux/include/asm-x86/atomic_64.h =================================================================== --- linux.orig/include/asm-x86/atomic_64.h +++ linux/include/asm-x86/atomic_64.h @@ -431,6 +431,32 @@ static inline int atomic64_add_unless(at return c != (u); } +/** + * atomic_inc_short - increment of a short integer + * @v: pointer to type int + * + * Atomically adds 1 to @v + * Returns the new value of @u + */ +static inline short int atomic_inc_short(short int *v) +{ + asm(LOCK_PREFIX "addw $1, %0" : "+m" (*v)); + return *v; +} + +/** + * atomic_or_long - OR of two long integers + * @v1: pointer to type unsigned long + * @v2: pointer to type unsigned long + * + * Atomically ORs @v1 and @v2 + * Returns the result of the OR + */ +static inline void atomic_or_long(unsigned long *v1, unsigned long v2) +{ + asm(LOCK_PREFIX "orq %1, %0" : "+m" (*v1) : "r" (v2)); +} + #define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0) /* These are x86-specific, used by some header files */ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/