From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751828AbdI0TZr (ORCPT ); Wed, 27 Sep 2017 15:25:47 -0400 Received: from aserp1040.oracle.com ([141.146.126.69]:36072 "EHLO aserp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750846AbdI0TZm (ORCPT ); Wed, 27 Sep 2017 15:25:42 -0400 From: Vijay Kumar To: davem@davemloft.net Cc: linux-kernel@vger.kernel.org, sparclinux@vger.kernel.org, babu.moger@oracle.com, rob.gardner@oracle.com Subject: [PATCH v2 0/2] sparc64: Optimize fls, fls64 and __fls Date: Wed, 27 Sep 2017 13:25:24 -0600 Message-Id: <1506540326-9604-1-git-send-email-vijay.ac.kumar@oracle.com> X-Mailer: git-send-email 1.7.1 X-Source-IP: aserv0022.oracle.com [141.146.126.234] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org SPARC provides lzcnt instruction (with VIS3) which can be used to optimize fls, fls64 and __fls functions. For the systems that supports lzcnt instruction, we now do boot time patching to use sparc optimized fls, fls64 and __fls functions. v1->v2: - Fixed delay slot issue pointed by Rob Gardner in patch 2/2. Vijay Kumar (2): sparc64: Define SPARC default fls and __fls sparc64: Use lzcnt instruction for fls and __fls arch/sparc/Makefile | 1 + arch/sparc/include/asm/bitops_64.h | 7 +- arch/sparc/kernel/head_64.S | 2 + arch/sparc/lib/Makefile | 4 + arch/sparc/lib/NG4fls.S | 31 +++++++++ arch/sparc/lib/NG4patch.S | 9 +++ arch/sparc/lib/fls.S | 126 ++++++++++++++++++++++++++++++++++++ 7 files changed, 177 insertions(+), 3 deletions(-) create mode 100644 arch/sparc/lib/NG4fls.S create mode 100644 arch/sparc/lib/fls.S