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=-2.6 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,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 F01D8C55182 for ; Mon, 20 Apr 2020 21:04:03 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id B43B62084D for ; Mon, 20 Apr 2020 21:04:03 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="KLGeSVsa" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B43B62084D Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 4D22B8E0005; Mon, 20 Apr 2020 17:04:03 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 482388E0003; Mon, 20 Apr 2020 17:04:03 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 3705E8E0005; Mon, 20 Apr 2020 17:04:03 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0229.hostedemail.com [216.40.44.229]) by kanga.kvack.org (Postfix) with ESMTP id 1C9588E0003 for ; Mon, 20 Apr 2020 17:04:03 -0400 (EDT) Received: from smtpin01.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id CC2B9181AEF31 for ; Mon, 20 Apr 2020 21:04:02 +0000 (UTC) X-FDA: 76729460724.01.screw76_5d7cc6ef03a1c X-HE-Tag: screw76_5d7cc6ef03a1c X-Filterd-Recvd-Size: 3296 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by imf21.hostedemail.com (Postfix) with ESMTP for ; Mon, 20 Apr 2020 21:04:02 +0000 (UTC) Received: from willie-the-truck (236.31.169.217.in-addr.arpa [217.169.31.236]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 5C73920724; Mon, 20 Apr 2020 21:03:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1587416641; bh=B6tu4PQYxSMIHwT8IIW2BqLBbquTlTHzD+k7VKRWKiY=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=KLGeSVsaKscXEomFaxLVk4/08pxBFxLmWwvvp/xVS1rq81o2K8P2Bnl1v4kjl/sb2 XFU86f/Aa7FwnQNCuJpc1uYdan2zLkqza8h9twbemUXWVnnZf6ZvW2IinHp4Lp24AC ML8bBjhsBDp85WIi7Pe/U+i6OaK7Z5IAiZJu87jg= Date: Mon, 20 Apr 2020 22:03:55 +0100 From: Will Deacon To: Anshuman Khandual Cc: linux-mm@kvack.org, Vineet Gupta , Russell King , Catalin Marinas , Thomas Bogendoerfer , Thomas Gleixner , Ingo Molnar , Borislav Petkov , "H. Peter Anvin" , Steven Rostedt , Dave Hansen , Andy Lutomirski , Peter Zijlstra , Andrew Morton , nouveau@lists.freedesktop.org, linux-snps-arc@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-mips@vger.kernel.org, x86@kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 2/2] mm/thp: Rename pmd_mknotpresent() as pmd_mknotvalid() Message-ID: <20200420210354.GD29998@willie-the-truck> References: <1584680057-13753-1-git-send-email-anshuman.khandual@arm.com> <1584680057-13753-3-git-send-email-anshuman.khandual@arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1584680057-13753-3-git-send-email-anshuman.khandual@arm.com> User-Agent: Mutt/1.10.1 (2018-07-13) X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Fri, Mar 20, 2020 at 10:24:17AM +0530, Anshuman Khandual wrote: > pmd_present() is expected to test positive after pmdp_mknotpresent() as the > PMD entry still points to a valid huge page in memory. pmdp_mknotpresent() > implies that given PMD entry is just invalidated from MMU perspective while > still holding on to pmd_page() referred valid huge page thus also clearing > pmd_present() test. This creates the following situation which is counter > intuitive. > > [pmd_present(pmd_mknotpresent(pmd)) = true] > > This renames pmd_mknotpresent() as pmd_mknotvalid() reflecting the helper's > functionality more accurately while changing the above mentioned situation > as follows. This does not create any functional change. > > [pmd_present(pmd_mknotvalid(pmd)) = true] > > This is not applicable for platforms that define own pmdp_invalidate() via > __HAVE_ARCH_PMDP_INVALIDATE. Suggestion for renaming came during a previous > discussion here. Bikeshed alert: maybe pmd_mkinvalid() would be better, given that this is a one-trick pony for pmdp_invalidate()? Will