From patchwork Wed May 16 05:43:44 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 10402691 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id AFEFD601F9 for ; Wed, 16 May 2018 05:45:55 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 9F8EA28733 for ; Wed, 16 May 2018 05:45:55 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 9419C28761; Wed, 16 May 2018 05:45:55 +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=-3.6 required=2.0 tests=BAYES_00, MAILING_LIST_MULTI, RCVD_IN_DNSWL_LOW autolearn=unavailable version=3.3.1 Received: from userp2130.oracle.com (userp2130.oracle.com [156.151.31.86]) (using TLSv1.2 with cipher AES256-SHA256 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 4229A28733 for ; Wed, 16 May 2018 05:45:54 +0000 (UTC) Received: from pps.filterd (userp2130.oracle.com [127.0.0.1]) by userp2130.oracle.com (8.16.0.22/8.16.0.22) with SMTP id w4G5fXJ3016920; Wed, 16 May 2018 05:45:18 GMT Received: from aserv0022.oracle.com (aserv0022.oracle.com [141.146.126.234]) by userp2130.oracle.com with ESMTP id 2hx29wb5n1-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 16 May 2018 05:45:18 +0000 Received: from oss.oracle.com (oss-old-reserved.oracle.com [137.254.22.2]) by aserv0022.oracle.com (8.14.4/8.14.4) with ESMTP id w4G5jHWj011284 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Wed, 16 May 2018 05:45:17 GMT Received: from localhost ([127.0.0.1] helo=lb-oss.oracle.com) by oss.oracle.com with esmtp (Exim 4.63) (envelope-from ) id 1fIpFV-0005eO-Bl; Tue, 15 May 2018 22:45:17 -0700 Received: from aserv0022.oracle.com ([141.146.126.234]) by oss.oracle.com with esmtp (Exim 4.63) (envelope-from ) id 1fIpFB-0005a5-J1 for ocfs2-devel@oss.oracle.com; Tue, 15 May 2018 22:44:57 -0700 Received: from userp2040.oracle.com (userp2040.oracle.com [156.151.31.90]) by aserv0022.oracle.com (8.14.4/8.14.4) with ESMTP id w4G5ivHD009847 (version=TLSv1/SSLv3 cipher=AES256-SHA256 bits=256 verify=FAIL) for ; Wed, 16 May 2018 05:44:57 GMT Received: from pps.filterd (userp2040.oracle.com [127.0.0.1]) by userp2040.oracle.com (8.16.0.22/8.16.0.22) with SMTP id w4G5gHkN006865 for ; Wed, 16 May 2018 05:44:57 GMT Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) by userp2040.oracle.com with ESMTP id 2j0b2fkan3-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO) for ; Wed, 16 May 2018 05:44:56 +0000 Received: from [93.83.86.253] (helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.90_1 #2 (Red Hat Linux)) id 1fIpEf-0008Bu-UZ; Wed, 16 May 2018 05:44:26 +0000 From: Christoph Hellwig To: Souptick Joarder , Matthew Wilcox Date: Wed, 16 May 2018 07:43:44 +0200 Message-Id: <20180516054348.15950-11-hch@lst.de> X-Mailer: git-send-email 2.17.0 In-Reply-To: <20180516054348.15950-1-hch@lst.de> References: <20180516054348.15950-1-hch@lst.de> X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html X-CLX-Shades: MLX X-CLX-Response: 1TFkXGRwdEQpMehcZGx0RCllNF2dmchEKWUkXGnEaEBp3BhkeHXEYEx0fEBp 3BhgaBhoRClleF2NjeREKSUYXRVhLSUZPdVpYRU5fSV5DRUQZdU9LEQpDThdlXGlOSUYaaBhNZh lpYmV9ZgdZGh5ubVhAb0dIH0t9cBEKWFwXHwQaBBsZHgdIHkseSRJLTgUbGgQbGhoEHhIEGxAbH hofGhEKXlkXeWd9RFARCk1cFxkTGhEKTFoXaG1NTV0RCkxGF2xraxEKQ1oXGxMSBBsZHQQYGhgE GxkZEQpCXhcbEQpEXhcYEQpESRcbGREKQkYXbV0BGh9jZ2EeGlMRCkJcFxoRCkJFF296T1xvZ3o cbBIeEQpCThdvHGxvQ1JPEm8THxEKQkwXbmVne0JyRlJrGhkRCkJsF2BnHWB6Yh5PRBNwEQpCQB dpbFtLZxJjHhx5AREKQlgXYn1veQFPGBlwcHsRCnBoF2UfbGFYXWBBQFhOEBoRCnBoF21OG28eT l9sZG54EBoRCnBoF2USY1NOfXBAbkVyEBoRCnBoF25FTmAeEwVBYE4aEBoRCnBoF3plH0RDU0Bc S0xbEBoRCnBsF28BfkNbZ05vckhSEBIfEQpwQxd6G31/GxlLQH5HRxAZGhEKbX4XGhEKWE0XSxE g X-PDR: PASS X-Source-IP: 198.137.202.133 X-ServerName: bombadil.infradead.org X-Proofpoint-SPF-Result: None X-Proofpoint-Virus-Version: vendor=nai engine=5900 definitions=8894 signatures=668698 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 priorityscore=317 malwarescore=0 suspectscore=2 phishscore=0 bulkscore=0 spamscore=0 clxscore=367 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1711220000 definitions=main-1805160057 X-Spam: Clean Cc: linux-arm-kernel@lists.infradead.org, linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-mm@kvack.org, ocfs2-devel@oss.oracle.com, devel@lists.orangefs.org, linux-fsdevel@vger.kernel.org, linux-mtd@lists.infradead.org, ceph-devel@vger.kernel.org, linux-ext4@vger.kernel.org, linux-btrfs@vger.kernel.org, lustre-devel@lists.lustre.org Subject: [Ocfs2-devel] [PATCH 10/14] vgem: separate errno from VM_FAULT_* values X-BeenThere: ocfs2-devel@oss.oracle.com X-Mailman-Version: 2.1.9 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: ocfs2-devel-bounces@oss.oracle.com Errors-To: ocfs2-devel-bounces@oss.oracle.com X-Proofpoint-Virus-Version: vendor=nai engine=5900 definitions=8894 signatures=668698 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=1 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1711220000 definitions=main-1805160057 X-Virus-Scanned: ClamAV using ClamSMTP And streamline the code in vgem_fault with early returns so that it is a little bit more readable. Signed-off-by: Christoph Hellwig --- drivers/gpu/drm/vgem/vgem_drv.c | 51 +++++++++++++++------------------ 1 file changed, 23 insertions(+), 28 deletions(-) diff --git a/drivers/gpu/drm/vgem/vgem_drv.c b/drivers/gpu/drm/vgem/vgem_drv.c index 2524ff116f00..a261e0aab83a 100644 --- a/drivers/gpu/drm/vgem/vgem_drv.c +++ b/drivers/gpu/drm/vgem/vgem_drv.c @@ -61,12 +61,13 @@ static void vgem_gem_free_object(struct drm_gem_object *obj) kfree(vgem_obj); } -static int vgem_gem_fault(struct vm_fault *vmf) +static vm_fault_t vgem_gem_fault(struct vm_fault *vmf) { struct vm_area_struct *vma = vmf->vma; struct drm_vgem_gem_object *obj = vma->vm_private_data; /* We don't use vmf->pgoff since that has the fake offset */ unsigned long vaddr = vmf->address; + struct page *page; int ret; loff_t num_pages; pgoff_t page_offset; @@ -85,35 +86,29 @@ static int vgem_gem_fault(struct vm_fault *vmf) ret = 0; } mutex_unlock(&obj->pages_lock); - if (ret) { - struct page *page; - - page = shmem_read_mapping_page( - file_inode(obj->base.filp)->i_mapping, - page_offset); - if (!IS_ERR(page)) { - vmf->page = page; - ret = 0; - } else switch (PTR_ERR(page)) { - case -ENOSPC: - case -ENOMEM: - ret = VM_FAULT_OOM; - break; - case -EBUSY: - ret = VM_FAULT_RETRY; - break; - case -EFAULT: - case -EINVAL: - ret = VM_FAULT_SIGBUS; - break; - default: - WARN_ON(PTR_ERR(page)); - ret = VM_FAULT_SIGBUS; - break; - } + if (!ret) + return 0; + + page = shmem_read_mapping_page(file_inode(obj->base.filp)->i_mapping, + page_offset); + if (!IS_ERR(page)) { + vmf->page = page; + return 0; + } + switch (PTR_ERR(page)) { + case -ENOSPC: + case -ENOMEM: + return VM_FAULT_OOM; + case -EBUSY: + return VM_FAULT_RETRY; + case -EFAULT: + case -EINVAL: + return VM_FAULT_SIGBUS; + default: + WARN_ON(PTR_ERR(page)); + return VM_FAULT_SIGBUS; } - return ret; } static const struct vm_operations_struct vgem_gem_vm_ops = {