Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755671Ab3JNPUP (ORCPT ); Mon, 14 Oct 2013 11:20:15 -0400 Received: from cam-admin0.cambridge.arm.com ([217.140.96.50]:47775 "EHLO cam-admin0.cambridge.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750814Ab3JNPUN (ORCPT ); Mon, 14 Oct 2013 11:20:13 -0400 Date: Mon, 14 Oct 2013 16:19:38 +0100 From: Will Deacon To: Jiang Liu Cc: Steven Rostedt , Catalin Marinas , Sandeepa Prabhu , Jiang Liu , "linux-arm-kernel@lists.infradead.org" , "linux-kernel@vger.kernel.org" Subject: Re: [PATCH v2 0/7] Optimize jump label implementation on ARM64 Message-ID: <20131014151938.GJ10491@mudshark.cambridge.arm.com> References: <1381675827-1610-1-git-send-email-liuj97@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1381675827-1610-1-git-send-email-liuj97@gmail.com> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 970 Lines: 21 On Sun, Oct 13, 2013 at 03:50:20PM +0100, Jiang Liu wrote: > From: Jiang Liu > > This patchset tries to optimize arch specfic jump label implementation > for ARM64 by dynamic kernel text patching. > > To enable this feature, your toolchain must support "asm goto" extension > and "%c" constraint extesion. Current GCC for AARCH64 doesn't support > "%c", so you need a GCC patch similiar to this: > http://gcc.gnu.org/viewcvs/gcc/trunk/gcc/config/arm/arm.c?view=patch&r1=175293&r2=175565&pathrev=175565 > http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48637 Right, but this is just for the ARM (AArch32) backend afaict. Are there any plans for upstream GCC to support this constraint for AArch64? Will -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/