Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752796AbdCTFKg (ORCPT ); Mon, 20 Mar 2017 01:10:36 -0400 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:52065 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751027AbdCTFKd (ORCPT ); Mon, 20 Mar 2017 01:10:33 -0400 From: "Aneesh Kumar K.V" To: "Kirill A. Shutemov" , Linus Torvalds , Andrew Morton , x86@kernel.org, Thomas Gleixner , Ingo Molnar , Arnd Bergmann , "H. Peter Anvin" Cc: Andi Kleen , Dave Hansen , Andy Lutomirski , Michal Hocko , linux-arch@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, "Kirill A. Shutemov" Subject: Re: [PATCH 26/26] x86/mm: allow to have userspace mappings above 47-bits In-Reply-To: <20170313055020.69655-27-kirill.shutemov@linux.intel.com> References: <20170313055020.69655-1-kirill.shutemov@linux.intel.com> <20170313055020.69655-27-kirill.shutemov@linux.intel.com> Date: Mon, 20 Mar 2017 10:40:20 +0530 MIME-Version: 1.0 Content-Type: text/plain X-TM-AS-MML: disable x-cbid: 17032005-7323-0000-0000-000000DC4A55 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 17032005-7324-0000-0000-0000028157F6 Message-Id: <8760j4sfcz.fsf@skywalker.in.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:,, definitions=2017-03-20_04:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=1 malwarescore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1702020001 definitions=main-1703200046 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 997 Lines: 34 "Kirill A. Shutemov" writes: @@ -168,6 +182,10 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0, > unsigned long addr = addr0; > struct vm_unmapped_area_info info; > > + addr = mpx_unmapped_area_check(addr, len, flags); > + if (IS_ERR_VALUE(addr)) > + return addr; > + > /* requested length too big for entire address space */ > if (len > TASK_SIZE) > return -ENOMEM; > @@ -192,6 +210,14 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0, > info.length = len; > info.low_limit = PAGE_SIZE; > info.high_limit = mm->mmap_base; > + > + /* > + * If hint address is above DEFAULT_MAP_WINDOW, look for unmapped area > + * in the full address space. > + */ > + if (addr > DEFAULT_MAP_WINDOW) > + info.high_limit += TASK_SIZE - DEFAULT_MAP_WINDOW; > + Is this ok for 32 bit application ? > info.align_mask = 0; > info.align_offset = pgoff << PAGE_SHIFT; > if (filp) { -aneesh