linux-kernel - Re: [PATCH 0/2] selftests/nolibc: small simplification of test development phase

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Date:   Mon, 23 Jan 2023 09:40:03 -0800
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     Ammar Faizi <ammarfaizi2@...weeb.org>
Cc:     Willy Tarreau <w@....eu>, linux-kernel@...r.kernel.org,
        Shuah Khan <shuah@...nel.org>, linux-kselftest@...r.kernel.org
Subject: Re: [PATCH 0/2] selftests/nolibc: small simplification of test
 development phase

On Tue, Jan 24, 2023 at 12:31:01AM +0700, Ammar Faizi wrote:
> On Mon, Jan 23, 2023 at 06:20:16PM +0100, Willy Tarreau wrote:
> > Ah now I think I understand Paul's question. I didn't know that the
> > userland version was not always provided. I've always had both side
> > by side.
> > 
> > > It would be great if we can avoid building qemu from the source. But if
> > > not, let's go with that.
> > 
> > As Paul indicated, it's really trouble-free and I think I've only done
> > that since the very first day I started to use QEMU, reason why I probably
> > never noticed that not everything was packaged.
> > 
> > Then at least to respond to Paul, it could make sense to add a note that
> > on some distros the userland version might not always be provided and
> > might require a pretty simple rebuild of QEMU.
> 
> Ah well...
> 
> I figured it out. It turned qemu-user is a different package.
> So I have "qemu-system" installed, but not "qemu-user".
> 
> Without building from source, just do this on Ubuntu:
> 
>   $ sudo apt-get install qemu-user -y
>   ...
>   Preparing to unpack .../qemu-user_1%3a6.2+dfsg-2ubuntu6.6_amd64.deb ...
>   Unpacking qemu-user (1:6.2+dfsg-2ubuntu6.6) ...
>   Selecting previously unselected package qemu-user-binfmt.
>   Preparing to unpack .../qemu-user-binfmt_1%3a6.2+dfsg-2ubuntu6.6_amd64.deb ...
>   Unpacking qemu-user-binfmt (1:6.2+dfsg-2ubuntu6.6) ...
>   Setting up qemu-user (1:6.2+dfsg-2ubuntu6.6) ...
>   Setting up qemu-user-binfmt (1:6.2+dfsg-2ubuntu6.6) ...
>   Processing triggers for man-db (2.10.2-1) ...
> 
>   $ which qemu-x86_64
>   /usr/bin/qemu-x86_64
> 
>   $ sudo make run-user
>   MKDIR   sysroot/x86/include
>   make[1]: Entering directory '/home/ammarfaizi2/work/linux.work.cc/tools/include/nolibc'
>   make[2]: Entering directory '/home/ammarfaizi2/work/linux.work.cc'
>   make[2]: Leaving directory '/home/ammarfaizi2/work/linux.work.cc'
>   make[2]: Entering directory '/home/ammarfaizi2/work/linux.work.cc'
>     INSTALL /home/ammarfaizi2/work/linux.work.cc/tools/testing/selftests/nolibc/sysroot/sysroot/include
>   make[2]: Leaving directory '/home/ammarfaizi2/work/linux.work.cc'
>   make[1]: Leaving directory '/home/ammarfaizi2/work/linux.work.cc/tools/include/nolibc'
>     CC      nolibc-test
>   83 test(s) passed.
> 
> Sorry for that. I didn't know that they come from different packages.
> It works fine for me now.

I looked for that, but didn't find it, so thank you!

(Yes, I should have used dpkg, but I was lazy.)

Except that when I install Ubuntu 20.04's version, I get this:

------------------------------------------------------------------------

$ sudo make run-user
  MKDIR   sysroot/x86/include
make[1]: Entering directory '/home/git/linux-rcu/tools/include/nolibc'
make[2]: Entering directory '/home/git/linux-rcu'
make[2]: Leaving directory '/home/git/linux-rcu'
make[2]: Entering directory '/home/git/linux-rcu'
  INSTALL /home/git/linux-rcu/tools/testing/selftests/nolibc/sysroot/sysroot/include
make[2]: Leaving directory '/home/git/linux-rcu'
make[1]: Leaving directory '/home/git/linux-rcu/tools/include/nolibc'
  CC      nolibc-test
32 gettimeofday_null = -1 EFAULT        [FAIL]
See all results in /home/git/linux-rcu/tools/testing/selftests/nolibc/run.out

------------------------------------------------------------------------

I have attached run.out.

In contrast, with my hand-built qemu-x86_64, all tests passed.

This might be just a version-related bug, but figured I should let you
guys know.

							Thanx, Paul

View attachment "run.out" of type "text/plain" (3969 bytes)