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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 76CD5C678D4 for ; Tue, 17 Jan 2023 11:55:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236935AbjAQLzF (ORCPT ); Tue, 17 Jan 2023 06:55:05 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34268 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236541AbjAQLyv (ORCPT ); Tue, 17 Jan 2023 06:54:51 -0500 Received: from mail-ej1-x62b.google.com (mail-ej1-x62b.google.com [IPv6:2a00:1450:4864:20::62b]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 31D5B3346C for ; Tue, 17 Jan 2023 03:54:50 -0800 (PST) Received: by mail-ej1-x62b.google.com with SMTP id mg12so2423210ejc.5 for ; Tue, 17 Jan 2023 03:54:50 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:sender:from:to:cc:subject:date:message-id :reply-to; bh=mOTlX+2xkK1p+GnUE+ayQ0fDfjp/RAyyCQOOAvZYkGM=; b=q4QnDoUEQYCba0P9MfjTlEKkl7lCSelI40pAA4jAdOmMC1oAM3FllECRDClUfPVFbP PnW5gLo4kMoOdLLDtLwPYLR6Aao8uDm+YFN867efw9lzEzRJg6MshN/+ScEheHYnByNv jUsVlnfuU91TqZtqHCMVJt3m8awpCzNoqH//WBqgrkluuqGEjoYpa9IlclTbK6SOqhFM i+dkG7TqXcFUu/DGmTGUkp85E0UsFOPCrz6GvqdaY00GIUxHz8PmT2izI5NJeXRwqrf9 AyLILS4Z6lmVMhAOIbMROAtG1MoLbx2g1tS+6E0ieu8FgLy6VRbawgpCNpc/ZPD3UygR k3hA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:sender:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=mOTlX+2xkK1p+GnUE+ayQ0fDfjp/RAyyCQOOAvZYkGM=; b=sSgRuENzigoDb7idrbtI2cpvXpToudlGMeV1JtNMzdL71kv/N2on+nl3pTeIB+7try qzUWo6D4N183W2/smlPHAETCSMKFDOTlvdQ0wIkxSbX8MPTfpcZJ+Ph2HW1NfnGHeqy1 /3jV1kGlGMHvwZPngH2ie910KfIaLJo2ej/wQ1CummuCp+FjtePVOkEeKj32gv+1Hi70 rWiJlhCq47tnL0CdQFMSL8s6kCGSerq37DDx0EnhwlIDP6OFgIqCSiAx/7j83OqDTmGZ TNi7O2bpXzSD9JIm5HFQjAaYeB4gUk9IK1hTgyIFHV2MAn4teXud5elpfzZpUFhQDMz0 NQ+g== X-Gm-Message-State: AFqh2kqf8/UJg30kFFeXyeV+I5P+/lhYkcK399ViyLytgQCUDyNwWqCD UAdcSzu4etFUB52k28EIInY= X-Google-Smtp-Source: AMrXdXte64K/uel2SaxiSjwgohbfF0SMbp29SRu/54hYnBRnxBmiku+YJvwFUpzRlNSfAzolYRJIGA== X-Received: by 2002:a17:906:80cd:b0:86d:b50f:6b00 with SMTP id a13-20020a17090680cd00b0086db50f6b00mr2326176ejx.43.1673956488708; Tue, 17 Jan 2023 03:54:48 -0800 (PST) Received: from gmail.com (1F2EF20B.nat.pool.telekom.hu. [31.46.242.11]) by smtp.gmail.com with ESMTPSA id ed6-20020a056402294600b00499e5659988sm7369870edb.68.2023.01.17.03.54.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 17 Jan 2023 03:54:48 -0800 (PST) Sender: Ingo Molnar Date: Tue, 17 Jan 2023 12:54:46 +0100 From: Ingo Molnar To: Peter Zijlstra Cc: x86@kernel.org, Joan Bruguera , linux-kernel@vger.kernel.org, Juergen Gross , "Rafael J. Wysocki" , xen-devel , Jan Beulich , Roger Pau Monne , Kees Cook , mark.rutland@arm.com, Andrew Cooper , =?iso-8859-1?Q?J=F6rg_R=F6del?= , "H. Peter Anvin" Subject: Re: [PATCH v2 6/7] x86/power: Sprinkle some noinstr Message-ID: References: <20230116142533.905102512@infradead.org> <20230116143645.888786209@infradead.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org * Peter Zijlstra wrote: > Nope, they do as they say on the tin. > > noinstr void foo(void) > { > } > > declares the whole function as non-instrumented. > > Within such functions, we demark regions where instrumentation is > allowed by: > > noinstr void foo(void) > { > instrumentation_begin(); > /* code that calls non-noinstr functions goes here */ > instrumentation_end(); Indeed, you are right - I should have gotten more of my morning tea ... :-/ Thanks, Ingo