linux-kernel - Re: [PATCH bpf-next] kallsyms: move module-related functions under correct configs

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Date:   Tue, 28 Mar 2023 10:23:10 +0200
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Luis Chamberlain <mcgrof@...nel.org>,
        Viktor Malik <vmalik@...hat.com>
Cc:     bpf@...r.kernel.org, linux-modules@...r.kernel.org,
        linux-kernel@...r.kernel.org, Alexei Starovoitov <ast@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <martin.lau@...ux.dev>,
        Song Liu <song@...nel.org>, Yonghong Song <yhs@...com>,
        KP Singh <kpsingh@...nel.org>,
        Stanislav Fomichev <sdf@...gle.com>,
        Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>, kernel test robot <lkp@...el.com>
Subject: Re: [PATCH bpf-next] kallsyms: move module-related functions under
 correct configs

On 3/27/23 9:28 PM, Luis Chamberlain wrote:
> On Mon, Mar 27, 2023 at 08:20:56PM +0200, Viktor Malik wrote:
>> On 3/27/23 19:47, Luis Chamberlain wrote:
>>> On Mon, Mar 27, 2023 at 06:12:51PM +0200, Viktor Malik wrote:
>>>> Functions for searching module kallsyms should have non-empty
>>>> definitions only if CONFIG_MODULES=y and CONFIG_KALLSYMS=y. Until now,
>>>> only CONFIG_MODULES check was used for many of these, which may have
>>>> caused complilation errors on some configs.
>>>>
>>>> This patch moves all relevant functions under the correct configs.
>>>>
>>>> Signed-off-by: Viktor Malik <vmalik@...hat.com>
>>>> Reported-by: kernel test robot <lkp@...el.com>
>>>> Link: https://lore.kernel.org/oe-kbuild-all/202303181535.RFDCnz3E-lkp@intel.com/
>>>
>>> Thanks Viktor!  Does this fix something from an existing commit? If so
>>> which one?  The commit log should mention it.
>>
>> Ah, right, I forgot about that. The commit log is missing:
>>
>> Fixes: bd5314f8dd2d ("kallsyms, bpf: Move find_kallsyms_symbol_value out of internal header")
>>
>> I can post v2 but I'm also fine with maintainers applying the tag.
> 
> That patch went through the bpf tree so its fix can go throug that tree.
> So up to Daniel if he wants a new patch.

Fixing up is fine with me. Viktor, which config combinations did you test for this
patch and under which architectures?

I suspect kbuild bot might still complain. For example, your patch moves
dereference_module_function_descriptor() stub definition under !CONFIG_MODULES ||
!CONFIG_KALLSYMS. Looking at ppc's dereference_module_function_descriptor()
implementation (!CONFIG_PPC64_ELF_ABI_V2 case), it's build under CONFIG_MODULES,
so you'll have two different implementations of the functions, the generic one
then w/o __weak attribute.

Also small nit, please fix the patch up wrt indentation to align with kernel coding
style.

Thanks,
Daniel