linux-kernel - Re: [PATCH 0/2] selftests/mlock2: Build warning fixes on Debian/m68k 4.0

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Date:	Mon, 9 Nov 2015 10:48:36 -0500
From:	Eric B Munson <emunson@...mai.com>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:	Thierry Reding <treding@...dia.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Shuah Khan <shuahkh@....samsung.com>,
	linux-api@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] selftests/mlock2: Build warning fixes on Debian/m68k
 4.0

On Mon, 09 Nov 2015, Geert Uytterhoeven wrote:

> 	Hi,
> 
> The following 2 patches are needed to fix build warnings on Debian/m68k
> 4.0.
> 
> However, after wiring up the mlock2 syscall, the test fails with:
> 
> # ./mlock2-tests
> fread kpageflags: Success
> # 
> 
> as the fread() call returns 0, not 1.

This would fail is the index into the kpageflags file is not being
calculated properly.  This tests works on x86_64 (I am in the process of
testing x86 incase this is a 32bit issue).  I am fairly sure that I
tested it on x86, but it has been a while.

> 
> The original commit description for the test said "Note that the limit
> test needs to be run a normal user.". But running it as a non-root user
> also fails:

The original commit says that the on-fault-limit test needs to be run as
a regular user becuase it relies on enforcing memory limits.
mlock2-tests has to be run as root to get access to the various files
under /proc it needs to verify things are working.

> 
> $ ./mlock2-tests 
> fopen kpageflags: Permission denied
> $ ls -l /proc/kpageflags 
> -r-------- 1 root root 0 Nov  9 11:05 /proc/kpageflags
> $
> 
> What am I missing?
> 
> Thanks!
> 
> Geert Uytterhoeven (2):
>   selftests/mlock2: Add missing #define _GNU_SOURCE
>   selftests/mlock2: Add ULL prefix to 64-bit constants
> 
>  tools/testing/selftests/vm/mlock2-tests.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> -- 
> 1.9.1
> 
> Gr{oetje,eeting}s,
> 
> 						Geert
> 
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org
> 
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
> 							    -- Linus Torvalds

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