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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id EEFBEC433F5 for ; Wed, 13 Oct 2021 01:46:58 +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 9CA176101D for ; Wed, 13 Oct 2021 01:46:58 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 9CA176101D Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.alibaba.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:Date: Message-ID:From:References:Cc:To:Subject:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Owner; bh=OU9Mxn7auciFW5MOddpnjPoOPhbLg6DOLqUFetYoB+I=; b=nYvGsSX11EqsC5q39rCRIDmKYA LJKW9KqFZQ71CAbX9LXhxjMUFsLDTnTjcK7kCrG4zjtO2ikAMFsVZwvushWUJeqKtOBqBMskxqwe2 7KRP8/gTaMTh87hwWz+FOaulRWJ8OQa/vXXOh988CCl0Hd/MyEg+GBrxY50AC08BZ4B+Kj50j7+9i sRH62cJqyqU/8CUrvifdTmwkeKO5Riw//rxatxcxbLdsA/A/nwyvoyhUyjNvFkV+7zEmG/xbuz54D 5D0elPr3MxZn7y+P4SO8fjGA3Zs3uc1+6iY/i0DA5hNSMIUvH0JgXqYiLzRavx/xHgKWi51jg/rZp 7HEo3atA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1maTLt-00EaiA-Tw; Wed, 13 Oct 2021 01:46:41 +0000 Received: from out30-54.freemail.mail.aliyun.com ([115.124.30.54]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1maTLp-00EagY-7Z for linux-riscv@lists.infradead.org; Wed, 13 Oct 2021 01:46:40 +0000 X-Alimail-AntiSpam: AC=PASS; BC=-1|-1; BR=01201311R861e4; CH=green; DM=||false|; DS=||; FP=0|-1|-1|-1|0|-1|-1|-1; HT=e01e04357; MF=yun.wang@linux.alibaba.com; NM=1; PH=DS; RN=31; SR=0; TI=SMTPD_---0UrdGZLQ_1634089590; Received: from testdeMacBook-Pro.local(mailfrom:yun.wang@linux.alibaba.com fp:SMTPD_---0UrdGZLQ_1634089590) by smtp.aliyun-inc.com(127.0.0.1); Wed, 13 Oct 2021 09:46:32 +0800 Subject: Re: [PATCH 2/2] ftrace: prevent preemption in perf_ftrace_function_call() To: Peter Zijlstra Cc: Guo Ren , Steven Rostedt , Ingo Molnar , "James E.J. Bottomley" , Helge Deller , Michael Ellerman , Benjamin Herrenschmidt , Paul Mackerras , Paul Walmsley , Palmer Dabbelt , Albert Ou , Thomas Gleixner , Borislav Petkov , x86@kernel.org, "H. Peter Anvin" , Josh Poimboeuf , Jiri Kosina , Miroslav Benes , Petr Mladek , Joe Lawrence , Colin Ian King , Masami Hiramatsu , Nicholas Piggin , Jisheng Zhang , linux-csky@vger.kernel.org, linux-kernel@vger.kernel.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, live-patching@vger.kernel.org References: <8c7de46d-9869-aa5e-2bb9-5dbc2eda395e@linux.alibaba.com> <7ec34e08-a357-58d6-2ce4-c7472d8b0381@linux.alibaba.com> From: =?UTF-8?B?546L6LSH?= Message-ID: <1193d016-ec4d-2b29-4d33-5a04ca85c14d@linux.alibaba.com> Date: Wed, 13 Oct 2021 09:45:45 +0800 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.13; rv:78.0) Gecko/20100101 Thunderbird/78.14.0 MIME-Version: 1.0 In-Reply-To: Content-Language: en-US X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20211012_184637_456716_3C2971AE X-CRM114-Status: GOOD ( 13.05 ) X-BeenThere: linux-riscv@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: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org CgpPbiAyMDIxLzEwLzEyIOS4i+WNiDc6MjAsIFBldGVyIFppamxzdHJhIHdyb3RlOgo+IE9uIFR1 ZSwgT2N0IDEyLCAyMDIxIGF0IDAxOjQwOjMxUE0gKzA4MDAsIOeOi+i0hyB3cm90ZToKPiAKPj4g ZGlmZiAtLWdpdCBhL2tlcm5lbC90cmFjZS90cmFjZV9ldmVudF9wZXJmLmMgYi9rZXJuZWwvdHJh Y2UvdHJhY2VfZXZlbnRfcGVyZi5jCj4+IGluZGV4IDZhZWQxMGUuLjMzYzJmNzYgMTAwNjQ0Cj4+ IC0tLSBhL2tlcm5lbC90cmFjZS90cmFjZV9ldmVudF9wZXJmLmMKPj4gKysrIGIva2VybmVsL3Ry YWNlL3RyYWNlX2V2ZW50X3BlcmYuYwo+PiBAQCAtNDQxLDEyICs0NDEsMTkgQEAgdm9pZCBwZXJm X3RyYWNlX2J1Zl91cGRhdGUodm9pZCAqcmVjb3JkLCB1MTYgdHlwZSkKPj4gIAlpZiAoIXJjdV9p c193YXRjaGluZygpKQo+PiAgCQlyZXR1cm47Cj4+Cj4+ICsJLyoKPj4gKwkgKiBQcmV2ZW50IENQ VSBjaGFuZ2luZyBmcm9tIG5vdyBvbi4gcmN1IG11c3QKPj4gKwkgKiBiZSBpbiB3YXRjaGluZyBp ZiB0aGUgdGFzayB3YXMgbWlncmF0ZWQgYW5kCj4+ICsJICogc2NoZWR1bGVkLgo+PiArCSAqLwo+ PiArCXByZWVtcHRfZGlzYWJsZV9ub3RyYWNlKCk7Cj4+ICsKPj4gIAlpZiAoKHVuc2lnbmVkIGxv bmcpb3BzLT5wcml2YXRlICE9IHNtcF9wcm9jZXNzb3JfaWQoKSkKPj4gLQkJcmV0dXJuOwo+PiAr CQlnb3RvIG91dDsKPj4KPj4gIAliaXQgPSBmdHJhY2VfdGVzdF9yZWN1cnNpb25fdHJ5bG9jayhp cCwgcGFyZW50X2lwKTsKPj4gIAlpZiAoYml0IDwgMCkKPj4gLQkJcmV0dXJuOwo+PiArCQlnb3Rv IG91dDsKPj4KPj4gIAlldmVudCA9IGNvbnRhaW5lcl9vZihvcHMsIHN0cnVjdCBwZXJmX2V2ZW50 LCBmdHJhY2Vfb3BzKTsKPj4KPiAKPiBUaGlzIHNlZW1zIHJhdGhlciBkYWZ0LCB3b3VsZG4ndCBp dCBiZSBlYXNpZXIgdG8ganVzdCBwdXQgdGhhdCBjaGVjawo+IHVuZGVyIHRoZSByZWN1cnNpb24g dGhpbmc/CgpJbiBjYXNlIGlmIHRoZSBjb25kaXRpb24gbWF0Y2hlZCwgZXh0cmEgbG9jay91bmxv Y2sgd2lsbCBiZSBpbnRyb2R1Y2VkLApidXQgSSBndWVzcyB0aGF0J3MgYWNjZXB0YWJsZSBzaW5j ZSB0aGlzIHNlZW1zIHVubGlrZWx5IHRvIGhhcHBlbiA6LVAKCldpbGwgbW92ZSB0aGUgY2hlY2sg aW4gdjIuCgpSZWdhcmRzLApNaWNoYWVsIFdhbmcKCj4gCgpfX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fXwpsaW51eC1yaXNjdiBtYWlsaW5nIGxpc3QKbGludXgt cmlzY3ZAbGlzdHMuaW5mcmFkZWFkLm9yZwpodHRwOi8vbGlzdHMuaW5mcmFkZWFkLm9yZy9tYWls bWFuL2xpc3RpbmZvL2xpbnV4LXJpc2N2Cg==