From patchwork Tue Jul 24 08:45:05 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Huaisheng Ye X-Patchwork-Id: 10541667 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 1C19A14BC for ; Tue, 24 Jul 2018 08:46:00 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 0B460286D6 for ; Tue, 24 Jul 2018 08:46:00 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id F304E28787; Tue, 24 Jul 2018 08:45:59 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.8 required=2.0 tests=BAYES_00,DKIM_SIGNED, FREEMAIL_FROM,MAILING_LIST_MULTI,RCVD_IN_DNSWL_NONE autolearn=ham version=3.3.1 Received: from ml01.01.org (ml01.01.org [198.145.21.10]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 76060286D6 for ; Tue, 24 Jul 2018 08:45:59 +0000 (UTC) Received: from [127.0.0.1] (localhost [IPv6:::1]) by ml01.01.org (Postfix) with ESMTP id D5F46210C1232; Tue, 24 Jul 2018 01:45:58 -0700 (PDT) X-Original-To: linux-nvdimm@lists.01.org Delivered-To: linux-nvdimm@lists.01.org Received-SPF: Pass (sender SPF authorized) identity=mailfrom; client-ip=135.84.80.237; helo=sender-pp-092.zoho.com; envelope-from=yehs2007@zoho.com; receiver=linux-nvdimm@lists.01.org Received: from sender-pp-092.zoho.com (sender-pp-092.zoho.com [135.84.80.237]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by ml01.01.org (Postfix) with ESMTPS id 624EB210C0F60 for ; Tue, 24 Jul 2018 01:45:57 -0700 (PDT) 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 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 X-BeenThere: linux-nvdimm@lists.01.org X-Mailman-Version: 2.1.27 Precedence: list List-Id: "Linux-nvdimm developer list." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: axboe@kernel.dk, linux-s390@vger.kernel.org, chengnt@lenovo.com, linux-fsdevel@vger.kernel.org, heiko.carstens@de.ibm.com, linux-kernel@vger.kernel.org, willy@infradead.org, bart.vanassche@wdc.com, viro@zeniv.linux.org.uk, gregkh@linuxfoundation.org, schwidefsky@de.ibm.com, jack@suse.cz MIME-Version: 1.0 Errors-To: linux-nvdimm-bounces@lists.01.org Sender: "Linux-nvdimm" X-Virus-Scanned: ClamAV using ClamSMTP 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(-)