From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AIpwx4+EWeBu641sA9NKqGaFgRCKcmDjlj6AOr+oyGXnybi6ExcHkR1nCSL1RacP76KvMLN/6v/M ARC-Seal: i=1; a=rsa-sha256; t=1524253488; cv=none; d=google.com; s=arc-20160816; b=XAUPH0WtTsQ09KEBN3ilbL+Rfjnz5hqAD9eRBJdheMyhJ9j1furxDJupzK6hIwGX8b uXoG+wstU81NVP9Ep+9iMPvArHowc0VHhAHnteoQkhPxn+TkdZshHewc57Y02Q8w08MD Qdh4dvuiMUm2EWdz6LgUGF6QyX2eWjpOEF0g0feP4dKR2JPwWKeEAN/p3e7RTdN5adJS ph9TwxTxTotvnHxkCVtevCZMlbi4/YrolYIl4r2tvrtz4/OeOKwYCAfQE0JFXY7/BkMh TheBNBr5zZO4sJyjc2wS6ziS6+hb0fLyzyMfWOS5BhME6hLqdM8engwQL6fEnRfkLtPK 11/Q== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=content-transfer-encoding:content-language:in-reply-to:mime-version :user-agent:date:message-id:from:cc:references:to:subject :arc-authentication-results; bh=VuA08VKk7bMIfmsaqdyJNTYkYVKHaKOeeIqFJeUOCqA=; b=mj/Cz0gdM4EasCfQMdzTDioai5G7RAy3iUD8qlh3j5LvmXPgPr0wL7UQIxtoWgSeY0 QdQyNM0GnVxx66u8qM/reGSPiLTdVu6DjSme2F27jan87x8/NemtFi10NS6tZKUvwsqi /J460eJr4XA3Drvd+mGBsSf5hZGEZYr0hZesqMWAoLu9xSLvJO/1ldW31zrevXdwswdB 8MYPgISrJ/nYOHj5ACuqE2Wn2WBgHCUICETBXA1NTokfoE6uvfF4uRNHuFKG8UlGA2Ge VOmsfjE+Efdo+qkTWMUCg8wJCpsZVll0HYeq4nUEzmAwrAgAl/N9vwNkxkeWt+Y5GqF3 3ZVQ== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: best guess record for domain of dave.hansen@linux.intel.com designates 192.55.52.136 as permitted sender) smtp.mailfrom=dave.hansen@linux.intel.com Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of dave.hansen@linux.intel.com designates 192.55.52.136 as permitted sender) smtp.mailfrom=dave.hansen@linux.intel.com X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.49,302,1520924400"; d="scan'208";a="193134236" Subject: Re: [PATCH 2/2] x86, pti: fix boot warning from Global-bit setting To: Thomas Gleixner References: <20180417211302.421F6442@viggo.jf.intel.com> <20180417211304.7B3F1FDB@viggo.jf.intel.com> Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, mceier@gmail.com, aaro.koskinen@nokia.com, aarcange@redhat.com, luto@kernel.org, arjan@linux.intel.com, bp@alien8.de, dan.j.williams@intel.com, dwmw2@infradead.org, gregkh@linuxfoundation.org, hughd@google.com, jpoimboe@redhat.com, jgross@suse.com, keescook@google.com, torvalds@linux-foundation.org, namit@vmware.com, peterz@infradead.org From: Dave Hansen Message-ID: Date: Fri, 20 Apr 2018 12:44:47 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.7.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: =?utf-8?q?1598029619129049046?= X-GMAIL-MSGID: =?utf-8?q?1598295625596706589?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: On 04/20/2018 03:16 AM, Thomas Gleixner wrote: >> pageattr.c is not friendly when it encounters empty (zero) PTEs. The >> kernel linear map is exempt from these checks, but kernel text is not. >> This patch adds the code to also exempt kernel text from these checks. > Bah. Changelogs should tell the WHY and not the WHAT > >> The proximate cause of these warnings was most likely an __init area >> that spanned a 2MB page boundary that resulted in a "zero" PMD. > This doesn't make any sense at all. I've rewritten these changelogs and added some more fixes for this set. I'll be sending it shortly.