From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qk1-f196.google.com ([209.85.222.196]:37139 "EHLO mail-qk1-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726352AbeKKDlz (ORCPT ); Sat, 10 Nov 2018 22:41:55 -0500 Received: by mail-qk1-f196.google.com with SMTP id 131so7117285qkd.4 for ; Sat, 10 Nov 2018 09:56:05 -0800 (PST) Message-Id: <1541872563.3175498.1572453416.153B57C9@webmail.messagingengine.com> From: Rafael David Tinoco To: Alexey Dobriyan Cc: gorcunov@gmail.com, akpm@linux-foundation.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, shuah@kernel.org MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="utf-8" References: <20181108111105.GC13195@uranus.lan> <20181109113036.21512-1-rafael.tinoco@linaro.org> <20181110174727.GA26417@avx2> Date: Sat, 10 Nov 2018 15:56:03 -0200 In-Reply-To: <20181110174727.GA26417@avx2> Subject: Re: [PATCH] proc: fix and merge proc-self-map-file tests Sender: linux-fsdevel-owner@vger.kernel.org List-ID: On Sat, Nov 10, 2018, at 3:47 PM, Alexey Dobriyan wrote: > On Fri, Nov 09, 2018 at 09:30:36AM -0200, Rafael David Tinoco wrote: > > Merge proc-self-map-files tests into one since this test should focus in > > testing readlink in /proc/self/map_files/* only, and not trying to test > > mapping virtual address 0. > > > > Lowest virtual address for user space mapping in other architectures, > > like arm, is *at least* *(PAGE_SIZE * 2) and NULL hint does not > > guarantee that when MAP_FIXED flag, important to this test, is given. > > This patch also fixes this issue in remaining test. > > > - p = mmap(NULL, PAGE_SIZE, PROT_NONE, MAP_PRIVATE|MAP_FILE, fd, 0); > > + p = mmap((void *) (2 * PAGE_SIZE), PAGE_SIZE, PROT_NONE, > > I don't know ARM. Is this 2 page limitation a limitation of hardware or > kernel's? Kernel: https://bugs.linaro.org/show_bug.cgi?id=3782#c7