linux-kernel - Re: [PATCH] selftests/bpf: remove ARRAY

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Date:   Thu, 16 Dec 2021 07:42:33 -0700
From:   Shuah Khan <skhan@...uxfoundation.org>
To:     Andrii Nakryiko <andrii.nakryiko@...il.com>
Cc:     Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Shuah Khan <shuah@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>,
        Network Development <netdev@...r.kernel.org>,
        bpf <bpf@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>,
        Shuah Khan <skhan@...uxfoundation.org>
Subject: Re: [PATCH] selftests/bpf: remove ARRAY_SIZE defines from tests

On 12/15/21 9:04 PM, Andrii Nakryiko wrote:
> On Tue, Dec 14, 2021 at 12:27 PM Shuah Khan <skhan@...uxfoundation.org> wrote:
>>
>> On 12/11/21 6:53 PM, Alexei Starovoitov wrote:
>>> On Fri, Dec 10, 2021 at 9:34 AM Shuah Khan <skhan@...uxfoundation.org> wrote:
>>>>
>>>> ARRAY_SIZE is defined in multiple test files. Remove the definitions
>>>> and include header file for the define instead.
>>>>
>>>> Remove ARRAY_SIZE define and add include bpf_util.h to bring in the
>>>> define.
>>>>
>>>> Signed-off-by: Shuah Khan <skhan@...uxfoundation.org>
>>>> ---
>>>>    tools/testing/selftests/bpf/progs/netif_receive_skb.c | 5 +----
>>>>    tools/testing/selftests/bpf/progs/profiler.inc.h      | 5 +----
>>>>    tools/testing/selftests/bpf/progs/test_sysctl_loop1.c | 5 +----
>>>>    tools/testing/selftests/bpf/progs/test_sysctl_loop2.c | 4 +---
>>>>    tools/testing/selftests/bpf/progs/test_sysctl_prog.c  | 5 +----
>>>>    5 files changed, 5 insertions(+), 19 deletions(-)
>>>>
>>>> diff --git a/tools/testing/selftests/bpf/progs/netif_receive_skb.c b/tools/testing/selftests/bpf/progs/netif_receive_skb.c
>>>> index 1d8918dfbd3f..7a5ebd330689 100644
>>>> --- a/tools/testing/selftests/bpf/progs/netif_receive_skb.c
>>>> +++ b/tools/testing/selftests/bpf/progs/netif_receive_skb.c
>>>> @@ -5,6 +5,7 @@
>>>>    #include <bpf/bpf_helpers.h>
>>>>    #include <bpf/bpf_tracing.h>
>>>>    #include <bpf/bpf_core_read.h>
>>>> +#include <bpf/bpf_util.h>
>>>
>>> It doesn't look like you've built it.
>>>
>>> progs/test_sysctl_prog.c:11:10: fatal error: 'bpf/bpf_util.h' file not found
>>> #include <bpf/bpf_util.h>
>>>            ^~~~~~~~~~~~~~~~
>>>     CLNG-BPF [test_maps] socket_cookie_prog.o
>>> progs/test_sysctl_loop2.c:11:10: fatal error: 'bpf/bpf_util.h' file not found
>>> #include <bpf/bpf_util.h>
>>>            ^~~~~~~~~~~~~~~~
>>> 1 error generated.
>>> In file included from progs/profiler2.c:6:
>>> progs/profiler.inc.h:7:10: fatal error: 'bpf/bpf_util.h' file not found
>>> #include <bpf/bpf_util.h>
>>>            ^~~~~~~~~~~~~~~~
>>>
>>
>> Sorry about that. I built it - I think something is wrong in my env. Build
>> fails complaining about not finding vmlinux - I overlooked that the failure
>> happened before it got to progs.
>>
>> Error: failed to load BTF from .../vmlinux: No such file or directory
> 
> Please make sure that you build vmlinux before you build selftests,
> BPF selftests use vmlinux to generate vmlinux.h with all kernel types
> (among other things). So please also make sure that all the setting in
> selftests/bpf/config were used in your Kconfig.
> 
>>

The problem in my env. is that I don't have CONFIG_DEBUG_INFO_BTF in
my config and then don't have the dwarves and llvm-strip on my system.
Pains of upgrading.

I am all set now. On the other hand the vmlinux.h is a mess. It has
no guards for defines and including stdio.h and this generated
vmlinux.h causes all sorts of problems.

thanks,
-- Shuah