netdev - Re: selftests: connector: proc_filter.c:48:20: error: invalid application of 'sizeof' to an incomplete type 'struct proc

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Date: Fri, 28 Jul 2023 01:38:40 +0000
From: Anjali Kulkarni <anjali.k.kulkarni@...cle.com>
To: Shuah Khan <skhan@...uxfoundation.org>
CC: Naresh Kamboju <naresh.kamboju@...aro.org>,
        "open list:KERNEL SELFTEST
 FRAMEWORK" <linux-kselftest@...r.kernel.org>,
        open list
	<linux-kernel@...r.kernel.org>,
        "lkft-triage@...ts.linaro.org"
	<lkft-triage@...ts.linaro.org>,
        Netdev <netdev@...r.kernel.org>,
        clang-built-linux <llvm@...ts.linux.dev>,
        Shuah Khan <shuah@...nel.org>,
        Anders Roxell <anders.roxell@...aro.org>,
        "David S. Miller"
	<davem@...emloft.net>,
        Liam Howlett <liam.howlett@...cle.com>,
        Jakub Kicinski
	<kuba@...nel.org>
Subject: Re: selftests: connector: proc_filter.c:48:20: error: invalid
 application of 'sizeof' to an incomplete type 'struct proc_input'



> On Jul 27, 2023, at 5:43 PM, Shuah Khan <skhan@...uxfoundation.org> wrote:
> 
> On 7/27/23 11:34, Anjali Kulkarni wrote:
>>> On Jul 25, 2023, at 9:48 AM, Anjali Kulkarni <Anjali.K.Kulkarni@...cle.com> wrote:
>>> 
>>> 
>>> 
>>>> On Jul 25, 2023, at 6:05 AM, Naresh Kamboju <naresh.kamboju@...aro.org> wrote:
>>>> 
>>>> selftests: connector: proc_filter build failed with clang-16 due to below
>>>> warnings / errors on Linux next-20230725.
>>>> 
>>>> Reported-by: Linux Kernel Functional Testing <lkft@...aro.org>
>>>> 
>>>> clang --target=aarch64-linux-gnu -fintegrated-as
>>>> -Werror=unknown-warning-option -Werror=ignored-optimization-argument
>>>> -Werror=option-ignored -Werror=unused-command-line-argument
>>>> --target=aarch64-linux-gnu -fintegrated-as -Wall proc_filter.c -o
>>>> /home/tuxbuild/.cache/tuxmake/builds/1/build/kselftest/connector/proc_filter
>>>> proc_filter.c:42:12: error: invalid application of 'sizeof' to an
>>>> incomplete type 'struct proc_input'
>>>> char buff[NL_MESSAGE_SIZE];
>>>> ^~~~~~~~~~~~~~~
>>>> proc_filter.c:22:5: note: expanded from macro 'NL_MESSAGE_SIZE'
>>>> sizeof(struct proc_input))
>>>> ^ ~~~~~~~~~~~~~~~~~~~
>>>> proc_filter.c:42:12: note: forward declaration of 'struct proc_input'
>>>> proc_filter.c:22:19: note: expanded from macro 'NL_MESSAGE_SIZE'
>>>> sizeof(struct proc_input))
>>>> ^
>>>> proc_filter.c:48:20: error: invalid application of 'sizeof' to an
>>>> incomplete type 'struct proc_input'
>>>> hdr->nlmsg_len = NL_MESSAGE_SIZE;
>>>> ^~~~~~~~~~~~~~~
>>>> proc_filter.c:22:5: note: expanded from macro 'NL_MESSAGE_SIZE'
>>>> sizeof(struct proc_input))
>>>> ^ ~~~~~~~~~~~~~~~~~~~
>>>> proc_filter.c:42:12: note: forward declaration of 'struct proc_input'
>>>> char buff[NL_MESSAGE_SIZE];
>>>> ^
>>>> proc_filter.c:22:19: note: expanded from macro 'NL_MESSAGE_SIZE'
>>>> sizeof(struct proc_input))
>>>> ^
>>>> proc_filter.c:64:14: error: invalid application of 'sizeof' to an
>>>> incomplete type 'struct proc_input'
>>>> msg->len = sizeof(struct proc_input);
>>>> ^ ~~~~~~~~~~~~~~~~~~~
>>>> proc_filter.c:42:12: note: forward declaration of 'struct proc_input'
>>>> char buff[NL_MESSAGE_SIZE];
>>>> ^
>>>> proc_filter.c:22:19: note: expanded from macro 'NL_MESSAGE_SIZE'
>>>> sizeof(struct proc_input))
>>>> ^
>>>> proc_filter.c:65:35: error: incomplete definition of type 'struct proc_input'
>>>> ((struct proc_input *)msg->data)->mcast_op =
>>>> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^
>>>> proc_filter.c:42:12: note: forward declaration of 'struct proc_input'
>>>> char buff[NL_MESSAGE_SIZE];
>>>> ^
>>>> proc_filter.c:22:19: note: expanded from macro 'NL_MESSAGE_SIZE'
>>>> sizeof(struct proc_input))
>>>> ^
>>>> proc_filter.c:66:31: error: incomplete definition of type 'struct proc_input'
>>>> ((struct proc_input *)pinp)->mcast_op;
>>>> ~~~~~~~~~~~~~~~~~~~~~~~~~~~^
>>>> proc_filter.c:42:12: note: forward declaration of 'struct proc_input'
>>>> char buff[NL_MESSAGE_SIZE];
>>>> ^
>>>> proc_filter.c:22:19: note: expanded from macro 'NL_MESSAGE_SIZE'
>>>> sizeof(struct proc_input))
>>>> ^
>>>> proc_filter.c:67:35: error: incomplete definition of type 'struct proc_input'
>>>> ((struct proc_input *)msg->data)->event_type =
>>>> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^
>>>> proc_filter.c:42:12: note: forward declaration of 'struct proc_input'
>>>> char buff[NL_MESSAGE_SIZE];
>>>> ^
>>>> proc_filter.c:22:19: note: expanded from macro 'NL_MESSAGE_SIZE'
>>>> sizeof(struct proc_input))
>>>> ^
>>>> proc_filter.c:68:31: error: incomplete definition of type 'struct proc_input'
>>>> ((struct proc_input *)pinp)->event_type;
>>>> ~~~~~~~~~~~~~~~~~~~~~~~~~~~^
>>>> proc_filter.c:42:12: note: forward declaration of 'struct proc_input'
>>>> char buff[NL_MESSAGE_SIZE];
>>>> ^
>>>> proc_filter.c:22:19: note: expanded from macro 'NL_MESSAGE_SIZE'
>>>> sizeof(struct proc_input))
>>>> ^
>>>> proc_filter.c:245:20: error: variable has incomplete type 'struct proc_input'
>>>> struct proc_input input;
>>>> ^
>>>> proc_filter.c:245:9: note: forward declaration of 'struct proc_input'
>>>> struct proc_input input;
>>>> ^
>>>> proc_filter.c:264:22: error: use of undeclared identifier
>>>> 'PROC_EVENT_NONZERO_EXIT'
>>>> input.event_type = PROC_EVENT_NONZERO_EXIT;
>>>> ^
>>>> 9 errors generated.
>>>> make[4]: Leaving directory '/builds/linux/tools/testing/selftests/connector’
>>>> 
>>>> 
>>> These are expected since you need to have the changes in kernel that were committed with this patch to be installed on the kernel on which this is being compiled/run on. That is what the test is for, and the check to make it run on previous kernels as well was made a runtime check. Do you expect this to compile on a kernel without the corresponding kernel changes that were committed with this patch?
>>> 
>>> Anjali
>> Gentle ping - could you answer above questions?
>>> 
> 
> I am seeing the same on linux-next next-20230727
> 
> PROC_EVENT_NONZERO_EXIT is defined and NL_MESSAGE_SIZE
> 
> Anjali,
> 
> What are the dependent commits and should they be in next?
> Shouldn't this test patch go with the kernel patches it depends
> on? Can you do some testing on next and let me know why this
> test is failing to build?

All the commits went in together - however, the kernel changes that went in this patch need to be *installed on kernel on which this is being built*. Did you do that and then try? 

Jakub,
Do I need to revert the -f runtime filter option back to compile time and commit with that disabled so the selftest compiles on a kernel on which the new options are not defined?

Anjali

> 
> It is failing for me for sure.
> 
> There could be problem in the test Makefile that it isn't including
> the right headers.
> 
> thanks,
> -- Shuah
> 
> thanks,
> -- Shuah