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

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Message-ID: <20181109193936.GP13195@uranus.lan>
Date:   Fri, 9 Nov 2018 22:39:36 +0300
From:   Cyrill Gorcunov <gorcunov@...il.com>
To:     Rafael David Tinoco <rafael.tinoco@...aro.org>
Cc:     adobriyan@...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 04:48:49PM -0200, Rafael David Tinoco wrote:
> 
> let me see if I got this right.. the premise for this test is to have *at least*
> 2 vmas, so we can check if the symlink for the mem range, describing the mapped
> area, is correct in procfs files, correct ? if yes, then why to have a totally
> duplicated test... just to check if mmap(0, ... MAP_FIXED ...) would work ?
> 
> Wouldn't exist a better place to have such test ? like in
> tools/testing/selftests/vm/mmap-null.c or something like it ?  genuine
> curiosity.. thinking i'm missing something about this test...

Ah, I happen to miss that they are identical except nil address. Then
true, vm/ looks like more suitable place for that. Do you happen to
know which exactly archs reserve first page (together with x86)?