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=-19.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,USER_AGENT_GIT autolearn=ham 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 3AA06C43616 for ; Thu, 22 Apr 2021 06:19:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0E3686113C for ; Thu, 22 Apr 2021 06:19:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234814AbhDVGTv (ORCPT ); Thu, 22 Apr 2021 02:19:51 -0400 Received: from mail.kernel.org ([198.145.29.99]:35680 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230154AbhDVGTt (ORCPT ); Thu, 22 Apr 2021 02:19:49 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 15B886113C; Thu, 22 Apr 2021 06:19:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1619072355; bh=E81akF1BinjHKMvNozvRyjwjqZ1X1qBHHvRxS2i48PI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=uhF/ObuaXIspDxBYAAvqiR9bZWwB6AgoMlH014SLQhtOLankdq4B/GD3Yo0udRpVN V4O7zfQeYj3d3MsrkeqVdql8uSygos1lTLK7EI4LL+45XgG1WXnQAKKoqc+MSynyv8 RPTss4obNwjyO+I1nhKkRsUpm+BVzxRIOv8H69n8pyGU9MgJmnC8MVR812ygWZw88d IMPinfocfipp01RqC8gTj6sHqEEC14mHm4WBMVnRmpjfqnBGjgfwVLky+NEAH/sLGz ymht+5Lg6VmPoy5sPouM6ey44RYSp1fUy1r+DOgpc2ZVwQZt/vzKXsMWS96M//CVtD HCIHPVRr+SEcQ== From: Mike Rapoport To: linux-arm-kernel@lists.infradead.org Cc: Andrew Morton , Anshuman Khandual , Ard Biesheuvel , Catalin Marinas , David Hildenbrand , Marc Zyngier , Mark Rutland , Mike Rapoport , Mike Rapoport , Will Deacon , kvmarm@lists.cs.columbia.edu, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH v3 1/4] include/linux/mmzone.h: add documentation for pfn_valid() Date: Thu, 22 Apr 2021 09:18:59 +0300 Message-Id: <20210422061902.21614-2-rppt@kernel.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20210422061902.21614-1-rppt@kernel.org> References: <20210422061902.21614-1-rppt@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Mike Rapoport Add comment describing the semantics of pfn_valid() that clarifies that pfn_valid() only checks for availability of a memory map entry (i.e. struct page) for a PFN rather than availability of usable memory backing that PFN. The most "generic" version of pfn_valid() used by the configurations with SPARSEMEM enabled resides in include/linux/mmzone.h so this is the most suitable place for documentation about semantics of pfn_valid(). Suggested-by: Anshuman Khandual Signed-off-by: Mike Rapoport Reviewed-by: Anshuman Khandual --- include/linux/mmzone.h | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h index 47946cec7584..961f0eeefb62 100644 --- a/include/linux/mmzone.h +++ b/include/linux/mmzone.h @@ -1410,6 +1410,17 @@ static inline int pfn_section_valid(struct mem_section *ms, unsigned long pfn) #endif #ifndef CONFIG_HAVE_ARCH_PFN_VALID +/** + * pfn_valid - check if there is a valid memory map entry for a PFN + * @pfn: the page frame number to check + * + * Check if there is a valid memory map entry aka struct page for the @pfn. + * Note, that availability of the memory map entry does not imply that + * there is actual usable memory at that @pfn. The struct page may + * represent a hole or an unusable page frame. + * + * Return: 1 for PFNs that have memory map entries and 0 otherwise + */ static inline int pfn_valid(unsigned long pfn) { struct mem_section *ms; -- 2.28.0