From patchwork Tue Jan 8 23:47:36 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Anton Blanchard X-Patchwork-Id: 210573 X-Patchwork-Delegate: benh@kernel.crashing.org Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from ozlabs.org (localhost [IPv6:::1]) by ozlabs.org (Postfix) with ESMTP id 469652C0320 for ; Wed, 9 Jan 2013 10:48:04 +1100 (EST) Received: from kryten (ppp121-44-242-128.lns20.syd7.internode.on.net [121.44.242.128]) (using SSLv3 with cipher DHE-RSA-AES128-SHA (128/128 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTPSA id 3D2CB2C00BA; Wed, 9 Jan 2013 10:47:36 +1100 (EST) Date: Wed, 9 Jan 2013 10:47:36 +1100 From: Anton Blanchard To: eparis@redhat.com, viro@zeniv.linux.org.uk, benh@kernel.crashing.org, paulus@samba.org Subject: [PATCH 2/4] powerpc: Remove static branch prediction in 64bit traced syscall path Message-ID: <20130109104736.063d143b@kryten> In-Reply-To: <20130109104617.74e995a5@kryten> References: <20130109104617.74e995a5@kryten> X-Mailer: Claws Mail 3.8.1 (GTK+ 2.24.13; x86_64-pc-linux-gnu) Mime-Version: 1.0 Cc: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" Some distros enable auditing by default which forces us through the syscall trace path. Remove the static branch prediction in our 64bit syscall handler and let the hardware do the prediction. Signed-off-by: Anton Blanchard Index: b/arch/powerpc/kernel/entry_64.S =================================================================== --- a/arch/powerpc/kernel/entry_64.S +++ b/arch/powerpc/kernel/entry_64.S @@ -149,7 +149,7 @@ END_FW_FTR_SECTION_IFSET(FW_FEATURE_SPLP CURRENT_THREAD_INFO(r11, r1) ld r10,TI_FLAGS(r11) andi. r11,r10,_TIF_SYSCALL_T_OR_A - bne- syscall_dotrace + bne syscall_dotrace .Lsyscall_dotrace_cont: cmpldi 0,r0,NR_syscalls bge- syscall_enosys