From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756345Ab0BQLm5 (ORCPT ); Wed, 17 Feb 2010 06:42:57 -0500 Received: from fg-out-1718.google.com ([72.14.220.152]:39794 "EHLO fg-out-1718.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754593Ab0BQLm4 (ORCPT ); Wed, 17 Feb 2010 06:42:56 -0500 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=sender:from:to:cc:subject:date:message-id:x-mailer; b=et7oTP65VS2qxgaRpeHl6SEnU6KPho0h47LFUxvUABTGDsAT+fkWTlAnPqPmcMEwcM 23UkOm7NMLrg7ntDighVxknp9+vuvugkyPW78YtOUpdGn5a+UnKKStBWUj7dfFFo8zYs iKv6KaEmiOV3q+HB+5YiBpKJ/KT6GqcvQ16mE= From: Luca Barbieri To: mingo@elte.hu Cc: hpa@zytor.com, a.p.zijlstra@chello.nl, akpm@linux-foundation.org, linux-kernel@vger.kernel.org, Luca Barbieri Subject: [PATCH 0/10] x86-32: improve atomic64_t functions Date: Wed, 17 Feb 2010 12:42:32 +0100 Message-Id: <1266406962-17463-1-git-send-email-luca@luca-barbieri.com> X-Mailer: git-send-email 1.6.6.1.476.g01ddb Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This patchset improves the atomic64_t functions on x86-32. It also includes a testsuite that has been used to test this functionality and can test any atomic64_t implementation. It offers the following improvements: 1. Better code due to hand-written assembly (e.g. use of the ZF flag) 2. All atomic64 functions implemented, efficiently 3. Support for 386/486 due to the ability to alternatively use either the cmpxchg8b based implementation or the generic implementation 4. Use of SSE, if available, for atomic64_read and atomic64_set The first patches add functionality to the alternatives system to support the new atomic64_t code. A patch that improves cmpxchg64() using that functionality is also included. To test this code, enable CONFIG_ATOMIC64_SELFTEST, compile for 386 and boot normally, with "clearcpuid=25" and with "clearcpuid=8 clearcpuid=25". You should receive a message stating that the atomic64 test passed, along with the selected configuration. Signed-off-by: Luca Barbieri