From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wr1-f68.google.com ([209.85.221.68]:41705 "EHLO mail-wr1-f68.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726244AbeKKDdU (ORCPT ); Sat, 10 Nov 2018 22:33:20 -0500 Date: Sat, 10 Nov 2018 20:47:27 +0300 From: Alexey Dobriyan To: Rafael David Tinoco 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 Subject: Re: [PATCH] proc: fix and merge proc-self-map-file tests Message-ID: <20181110174727.GA26417@avx2> References: <20181108111105.GC13195@uranus.lan> <20181109113036.21512-1-rafael.tinoco@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20181109113036.21512-1-rafael.tinoco@linaro.org> Sender: linux-fsdevel-owner@vger.kernel.org List-ID: 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?