linux-kernel - Re: [PATCH] proc: fix and merge proc-self-map-file tests

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Message-ID: <20181110174727.GA26417@avx2>
Date:   Sat, 10 Nov 2018 20:47:27 +0300
From:   Alexey Dobriyan <adobriyan@...il.com>
To:     Rafael David Tinoco <rafael.tinoco@...aro.org>
Cc:     gorcunov@...il.com, akpm@...ux-foundation.org,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-kselftest@...r.kernel.org, shuah@...nel.org
Subject: Re: [PATCH] proc: fix and merge proc-self-map-file tests

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?