From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757968AbdJKSva (ORCPT ); Wed, 11 Oct 2017 14:51:30 -0400 Received: from aserp1040.oracle.com ([141.146.126.69]:49033 "EHLO aserp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753334AbdJKSuZ (ORCPT ); Wed, 11 Oct 2017 14:50:25 -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, sam@ravnborg.org, anthony.yznaga@oracle.com Subject: [PATCH v4 0/5] sparc64: Optimize fls and __fls Date: Wed, 11 Oct 2017 12:50:01 -0600 Message-Id: <1507747806-10251-1-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, __fls and fls64 functions. For the systems that supports lzcnt instruction, we now do boot time patching to use sparc optimized fls, __fls and fls64 functions. v3->v4: - Fixed a typo. v2->v3: - Using ENTRY(), ENDPROC() for assembler functions. - Removed BITS_PER_LONG from __fls. - Using generic fls64(). - Replaced lzcnt instruction with .word directive. v1->v2: - Fixed delay slot issue. Vijay Kumar (5): sparc64: Define SPARC default fls function sparc64: Define SPARC default __fls function sparc64: SPARC optimized fls function sparc64: SPARC optimized __fls function sparc64: Use sparc optimized fls and __fls for T4 and above arch/sparc/include/asm/bitops_64.h | 5 ++- arch/sparc/kernel/head_64.S | 2 + arch/sparc/lib/Makefile | 3 ++ arch/sparc/lib/NG4fls.S | 30 ++++++++++++++++ arch/sparc/lib/NG4patch.S | 9 +++++ arch/sparc/lib/fls.S | 67 ++++++++++++++++++++++++++++++++++++ arch/sparc/lib/fls64.S | 61 ++++++++++++++++++++++++++++++++ 7 files changed, 175 insertions(+), 2 deletions(-) create mode 100644 arch/sparc/lib/NG4fls.S create mode 100644 arch/sparc/lib/fls.S create mode 100644 arch/sparc/lib/fls64.S