From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.3 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 37B13C433FF for ; Wed, 7 Aug 2019 10:29:46 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 0E28D21E6B for ; Wed, 7 Aug 2019 10:29:45 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="qGYunOFs" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 0E28D21E6B Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=51fbrFyNfmk/YdQWVNpkLaS4NH+CBvimOX8qdfvOlaA=; b=qGYunOFsUXHXHs Z2R6GsKUw/c0SFc0EXIvxKDpGLvEgTSW+loL8uIlglqRHMtFKO5b9yAOuNs4JkT4K/GSBRqa0Ps2m md3A36bLkVVkO37xCo1/6ozcfYoj5UOUhdBqbZWVN2Xs4kbi6pDVhh5UsqZqutqECcTz3JCiEggZK pfWSGAvh8Gtm5+ifP3fj+JW6HARKa8A3obkJFw6ENoKbOmiMa4NFsfvqzJGHg8V5BVYmKMNzVSvx0 BheujdNyuiGFpuWlm/b5O3dK/chAEJ9dzIVkpllO1cmOI6SSH4MZXuA5zPzkU6OmVwxnTtJReo9Uh tFXnM/JTeqNRrQjs5LzA==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92 #3 (Red Hat Linux)) id 1hvJCT-00013S-Gl; Wed, 07 Aug 2019 10:29:45 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.92 #3 (Red Hat Linux)) id 1hvJCR-00012h-1f for linux-arm-kernel@lists.infradead.org; Wed, 07 Aug 2019 10:29:44 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id D7F0828; Wed, 7 Aug 2019 03:29:40 -0700 (PDT) Received: from arm.com (usa-sjc-imap-foss1.foss.arm.com [10.121.207.14]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id D439A3F575; Wed, 7 Aug 2019 03:29:39 -0700 (PDT) Date: Wed, 7 Aug 2019 11:29:37 +0100 From: Dave Martin To: Nathan Huckleberry Subject: Re: [RFC PATCH] ARM: UNWINDER_FRAME_POINTER implementation for Clang Message-ID: <20190807102935.GE10425@arm.com> References: <20190801231046.105022-1-nhuck@google.com> <01222982-4206-9925-0482-639a79384451@arm.com> <20190805133940.GA10425@arm.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.23 (2014-03-12) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190807_032943_129889_B3159C95 X-CRM114-Status: GOOD ( 10.91 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Tri Vo , linux@armlinux.org.uk, linux-kernel@vger.kernel.org, clang-built-linux , Robin Murphy , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Tue, Aug 06, 2019 at 02:29:16PM -0700, Nathan Huckleberry wrote: > I'm not sure that we should disable a broken feature instead of > attempting a fix. > > CONFIG_FUNCTION_GRAPH_TRACER is dependent on CONFIG_FRAME_POINTER and > there have been reports by MediaTek that the frame pointer unwinder is > faster in some cases. Fair enough, just wanted to be sure we weren't doing something pointless. [...] Cheers ---Dave _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.3 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 24127C433FF for ; Wed, 7 Aug 2019 10:29:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id F3DC121E6B for ; Wed, 7 Aug 2019 10:29:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2387430AbfHGK3l (ORCPT ); Wed, 7 Aug 2019 06:29:41 -0400 Received: from foss.arm.com ([217.140.110.172]:46058 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727464AbfHGK3l (ORCPT ); Wed, 7 Aug 2019 06:29:41 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id D7F0828; Wed, 7 Aug 2019 03:29:40 -0700 (PDT) Received: from arm.com (usa-sjc-imap-foss1.foss.arm.com [10.121.207.14]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id D439A3F575; Wed, 7 Aug 2019 03:29:39 -0700 (PDT) Date: Wed, 7 Aug 2019 11:29:37 +0100 From: Dave Martin To: Nathan Huckleberry Cc: Tri Vo , linux@armlinux.org.uk, linux-kernel@vger.kernel.org, clang-built-linux , Robin Murphy , linux-arm-kernel@lists.infradead.org Subject: Re: [RFC PATCH] ARM: UNWINDER_FRAME_POINTER implementation for Clang Message-ID: <20190807102935.GE10425@arm.com> References: <20190801231046.105022-1-nhuck@google.com> <01222982-4206-9925-0482-639a79384451@arm.com> <20190805133940.GA10425@arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Aug 06, 2019 at 02:29:16PM -0700, Nathan Huckleberry wrote: > I'm not sure that we should disable a broken feature instead of > attempting a fix. > > CONFIG_FUNCTION_GRAPH_TRACER is dependent on CONFIG_FRAME_POINTER and > there have been reports by MediaTek that the frame pointer unwinder is > faster in some cases. Fair enough, just wanted to be sure we weren't doing something pointless. [...] Cheers ---Dave