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=-6.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,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 8A1CAC433B4 for ; Thu, 6 May 2021 14:46:44 +0000 (UTC) Received: from desiato.infradead.org (desiato.infradead.org [90.155.92.199]) (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 EFA1560FD7 for ; Thu, 6 May 2021 14:46:43 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org EFA1560FD7 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+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=desiato.20200630; h=Sender:Content-Type: List-Subscribe:List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id: In-Reply-To:MIME-Version:References:Message-ID:Subject:Cc:To:From:Date: Reply-To:Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date :Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=ytYaiYgQRoHjngAhaUSnTjWH3/QQljLBKo9jY2IDMPE=; b=BRal7LuhDRCGCVFjeuBfk75gu VUTk7rxKYIcYT7pdgyjqKOPDYrvATThAJPZiMLnJ5Bz7Wl2SBktxV/7+4aqlk6xmMCUY8Z0gS6cPx 2XHtniL9Nntm0kwu1mr+eZfM0+wZK+RQzDqoRGGjP2i2kf1HiLVWLtl2xLgwgPPAcsumZmMCJIfCE 25pDZpd1M+rO0D8WnDqlBZ1soHkEhDhIWjZqIY7AQY9MkH1j5iRnW9LzffzS9IqEpTALYdrCVnEeD v02ST65d0PO0xgHCAxHc0rTQaP6TwiL+V8w9vNOZEBPkUjG2GCBTBtjiyHZTSUZYCyISYpMA5p7ZN smjTPDssg==; Received: from localhost ([::1] helo=desiato.infradead.org) by desiato.infradead.org with esmtp (Exim 4.94 #2 (Red Hat Linux)) id 1lefEw-004SyT-4X; Thu, 06 May 2021 14:44:34 +0000 Received: from bombadil.infradead.org ([2607:7c80:54:e::133]) by desiato.infradead.org with esmtps (Exim 4.94 #2 (Red Hat Linux)) id 1lefEu-004SyL-Hj for linux-arm-kernel@desiato.infradead.org; Thu, 06 May 2021 14:44:32 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=In-Reply-To:Content-Type:MIME-Version :References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=BOhOb6YgchE5ciMqLJmE7uRp8FW6NeGqAmUnITHfSVU=; b=Cc87UEDOrAPwqb+YGqH0VDxSCM fh7m/lYpNoHFg97xFgHFlEBsMjYbuHGG5ukto72E1/aSXnH6iqcZYeC/aSoZDjjmPfcU32Pb4o+zq G2WIJ/AxE7/R2ROcFUZHJ10MnR3fvFd6iScUEwnnr+W2m02+V0lcC+bAc2JIR4apQQitn7HcpeG51 6oVcQtf6VBeOc+yhPvZZh465IkiKscY214pskWSgABvF+9sQxGlpBTpT3CtZpqS0yIr7YfVFs8nUN gNvqprvDukrKe14VoYs5NZLh2WN92m9c/V36CCRjuC5ZS0UDKAt967Syf+CGhW9nFb6r6qiUihE5h TiOxC6fw==; Received: from mail.kernel.org ([198.145.29.99]) by bombadil.infradead.org with esmtps (Exim 4.94 #2 (Red Hat Linux)) id 1lefEr-0066dn-Tx for linux-arm-kernel@lists.infradead.org; Thu, 06 May 2021 14:44:31 +0000 Received: by mail.kernel.org (Postfix) with ESMTPSA id 3F86B6103E; Thu, 6 May 2021 14:44:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1620312268; bh=BOhOb6YgchE5ciMqLJmE7uRp8FW6NeGqAmUnITHfSVU=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=hvDyxTYYz+7gnw5cNYYNCDXxdLfrZECQ3xI/3yWIQ3URVZNyowehM36n2Juet/7AB WuY+G79hTYxn6YL45OCZuVoieyqD60yM46C4qcTJJR2r1l58pHhr++zBIPq5DhbudN zeLG3Uaeqhe3qtTcmfIuuITVrZFPG93O9TdvDjevkth3BBpUyX18VciivkyJXSyl/7 5aQ5GI+V+6A4WmJfdJzFRtFjqDPx32uZoCJlaNxkdgFnJd2PuicV8miLFmyl4tqbVm bd1p4T8uEMXTRa/EpHhTcz6wx4WYyC2mDLOQHRFBYifvpM027W7e7NYZAIg4aPt0Az aBHviYEG6l7qQ== Date: Thu, 6 May 2021 15:43:52 +0100 From: Mark Brown To: madvenka@linux.microsoft.com Cc: jpoimboe@redhat.com, mark.rutland@arm.com, jthierry@redhat.com, catalin.marinas@arm.com, will@kernel.org, jmorris@namei.org, pasha.tatashin@soleen.com, linux-arm-kernel@lists.infradead.org, live-patching@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [RFC PATCH v3 4/4] arm64: Handle funtion graph tracer better in the unwinder Message-ID: <20210506144352.GF4642@sirena.org.uk> References: <65cf4dfbc439b010b50a0c46ec500432acde86d6> <20210503173615.21576-1-madvenka@linux.microsoft.com> <20210503173615.21576-5-madvenka@linux.microsoft.com> MIME-Version: 1.0 In-Reply-To: <20210503173615.21576-5-madvenka@linux.microsoft.com> X-Cookie: If it ain't baroque, don't phiques it. User-Agent: Mutt/1.10.1 (2018-07-13) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210506_074430_013260_50F81751 X-CRM114-Status: UNSURE ( 9.78 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: multipart/mixed; boundary="===============1229434202619411632==" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org --===============1229434202619411632== Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="A9z/3b/E4MkkD+7G" Content-Disposition: inline --A9z/3b/E4MkkD+7G Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Mon, May 03, 2021 at 12:36:15PM -0500, madvenka@linux.microsoft.com wrot= e: > From: "Madhavan T. Venkataraman" >=20 > The Function Graph Tracer modifies the return address of a traced function > to a return trampoline (return_to_handler()) to gather tracing data on > function return. When the unwinder encounters return_to_handler(), it cal= ls > ftrace_graph_get_ret_stack() to lookup the original return address in the > return address stack. This makes sense to me, I'll need to re-review properly with the changes earlier on in the series but should be fine. --A9z/3b/E4MkkD+7G Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQEzBAABCgAdFiEEreZoqmdXGLWf4p/qJNaLcl1Uh9AFAmCUAKcACgkQJNaLcl1U h9AW0gf/UurypPhoAeS5tOMAkEizbXPWkIR/0u9nPaBTkZHxtXZw07LAQrvIQ/wC Q2UqJ3qIzHtM1KGaSWU+VOS2GYMY7WGmlhr6JNCmIk3LUuSoFxtlUYjwDoYWdKB+ UL7DhFiXJHHj6UfEquGtXpQ8WE9rl5s7c0MIxhbRmvXQVi12PLHobB0ksvZpGIkG tcceN55GrlF6fTByLeQQwstNiD35/5dByUW0Swg3zXeYalbqd3GIlCv63K69IvFG vCw4PoDBO6KCkped6KVPH9Mu7Ddf/8v8ZSOYVVTAVlRC+YNqpVDk942WbQsa7rBC p8/D0psgllhFHPKxnwfUli1sECzxVw== =zBTy -----END PGP SIGNATURE----- --A9z/3b/E4MkkD+7G-- --===============1229434202619411632== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel --===============1229434202619411632==--