From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932315AbdESAhZ (ORCPT ); Thu, 18 May 2017 20:37:25 -0400 Received: from aserp1040.oracle.com ([141.146.126.69]:32277 "EHLO aserp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755026AbdESAhR (ORCPT ); Thu, 18 May 2017 20:37:17 -0400 From: Babu Moger To: davem@davemloft.net, peterz@infradead.org, mingo@redhat.com, arnd@arndb.de Cc: babu.moger@oracle.com, shannon.nelson@oracle.com, haakon.bugge@oracle.com, steven.sistare@oracle.com, vijay.ac.kumar@oracle.com, jane.chu@oracle.com, sparclinux@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org Subject: [PATCH 2/6] arch/sparc: Define config parameter CPU_BIG_ENDIAN Date: Thu, 18 May 2017 18:36:06 -0600 Message-Id: <1495154170-854693-3-git-send-email-babu.moger@oracle.com> X-Mailer: git-send-email 1.7.1 In-Reply-To: <1495154170-854693-1-git-send-email-babu.moger@oracle.com> References: <1495154170-854693-1-git-send-email-babu.moger@oracle.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Source-IP: userv0021.oracle.com [156.151.31.71] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Found this problem while enabling queued rwlock on SPARC. The parameter CONFIG_CPU_BIG_ENDIAN is used to clear the specific byte in qrwlock structure. Without this parameter, we clear the wrong byte. Here is the code. static inline u8 *__qrwlock_write_byte(struct qrwlock *lock) { return (u8 *)lock + 3 * IS_BUILTIN(CONFIG_CPU_BIG_ENDIAN); } Define CPU_BIG_ENDIAN for SPARC to fix it. Signed-off-by: Babu Moger Reviewed-by: Håkon Bugge Reviewed-by: Jane Chu Reviewed-by: Shannon Nelson Reviewed-by: Vijay Kumar --- arch/sparc/Kconfig | 4 ++++ 1 files changed, 4 insertions(+), 0 deletions(-) diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig index a2ad946..8787fc4 100644 --- a/arch/sparc/Kconfig +++ b/arch/sparc/Kconfig @@ -91,6 +91,10 @@ config ARCH_DEFCONFIG config ARCH_PROC_KCORE_TEXT def_bool y +config CPU_BIG_ENDIAN + bool + default y if SPARC64 + config ARCH_ATU bool default y if SPARC64 -- 1.7.1