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=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS,URIBL_BLOCKED, 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 6D44AECDFB8 for ; Tue, 24 Jul 2018 08:46:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1BFF320856 for ; Tue, 24 Jul 2018 08:46:04 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 1BFF320856 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=zoho.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388225AbeGXJvZ (ORCPT ); Tue, 24 Jul 2018 05:51:25 -0400 Received: from sender-pp-092.zoho.com ([135.84.80.237]:25311 "EHLO sender-pp-092.zoho.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727070AbeGXJvZ (ORCPT ); Tue, 24 Jul 2018 05:51:25 -0400 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=zapps768; d=zoho.com; h=from:to:cc:subject:date:message-id; b=peO5eEQQNxo5DRgrdkgbDlqLwYR/rRvrUKA6uPJ1zc0anLOtMBZf3mbVZ7dI4PImb53xNENVW9Ox iKXTH6L19BwfYpcZhgPeZbun07OgeEewgqrNi9rjNJ+sgXtxD7rq Received: from YEHS1XR956R00D1.lenovo.com (123.120.61.139 [123.120.61.139]) by mx.zohomail.com with SMTPS id 1532421925666919.9876390822808; Tue, 24 Jul 2018 01:45:25 -0700 (PDT) From: Huaisheng Ye To: linux-nvdimm@lists.01.org, dan.j.williams@intel.com Cc: ross.zwisler@linux.intel.com, willy@infradead.org, vishal.l.verma@intel.com, dave.jiang@intel.com, schwidefsky@de.ibm.com, heiko.carstens@de.ibm.com, viro@zeniv.linux.org.uk, martin.petersen@oracle.com, axboe@kernel.dk, gregkh@linuxfoundation.org, bart.vanassche@wdc.com, jack@suse.cz, linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org, linux-fsdevel@vger.kernel.org, chengnt@lenovo.com, Huaisheng Ye Subject: [PATCH 0/5] Do not request a pointer kaddr when not required Date: Tue, 24 Jul 2018 16:45:05 +0800 Message-Id: <20180724084510.6104-1-yehs2007@zoho.com> X-Mailer: git-send-email 2.17.0.windows.1 X-ZohoMailClient: External Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Huaisheng Ye Some functions within fs/dax and dax/super don't need to get kaddr from direct_access. Assigning NULL to kaddr to ->direct_access() is more straightforward and simple than offering a useless local pointer. So all direct_access() need to check the validity of second rank pointer kaddr for NULL assignment. If kaddr equals to NULL, it doesn't need to calculate its value. * This series are supplement to [PATCH v2 00/14]mm: Asynchronous + multithreaded memmap init for ZONE_DEVICE. [1] [1]: https://lkml.org/lkml/2018/7/16/828 Huaisheng Ye (5): libnvdimm, pmem: Allow a NULL-kaddr to ->direct_access() tools/testing/nvdimm: Allow a NULL-kaddr to ->direct_access() s390, dcssblk: Allow a NULL-kaddr to ->direct_access() filesystem-dax: Do not request a pointer kaddr when not required dax/super: Do not request a pointer kaddr when not required drivers/dax/super.c | 3 +-- drivers/nvdimm/pmem.c | 4 +++- drivers/s390/block/dcssblk.c | 3 ++- fs/dax.c | 3 +-- tools/testing/nvdimm/pmem-dax.c | 6 ++++-- 5 files changed, 11 insertions(+), 8 deletions(-) -- 1.8.3.1