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Subject: Re: [PATCH bpf-next] kallsyms: move module-related functions under
 correct configs
To:     Luis Chamberlain <mcgrof@kernel.org>,
        Viktor Malik <vmalik@redhat.com>
Cc:     bpf@vger.kernel.org, linux-modules@vger.kernel.org,
        linux-kernel@vger.kernel.org, Alexei Starovoitov <ast@kernel.org>,
        John Fastabend <john.fastabend@gmail.com>,
        Andrii Nakryiko <andrii@kernel.org>,
        Martin KaFai Lau <martin.lau@linux.dev>,
        Song Liu <song@kernel.org>, Yonghong Song <yhs@fb.com>,
        KP Singh <kpsingh@kernel.org>,
        Stanislav Fomichev <sdf@google.com>,
        Hao Luo <haoluo@google.com>, Jiri Olsa <jolsa@kernel.org>,
        "David S. Miller" <davem@davemloft.net>,
        Jakub Kicinski <kuba@kernel.org>,
        Jesper Dangaard Brouer <hawk@kernel.org>,
        Nathan Chancellor <nathan@kernel.org>,
        Nick Desaulniers <ndesaulniers@google.com>,
        Tom Rix <trix@redhat.com>, kernel test robot <lkp@intel.com>
References: <20230327161251.1129511-1-vmalik@redhat.com>
 <ZCHWtptOwPPtUe+u@bombadil.infradead.org>
 <c076e249-705a-e1bb-c657-f80cd4f2145b@redhat.com>
 <ZCHuU4Wui7Dwmdm2@bombadil.infradead.org>
From:   Daniel Borkmann <daniel@iogearbox.net>
Message-ID: <bfaefad6-692f-e687-ad55-05a43aa54883@iogearbox.net>
Date:   Tue, 28 Mar 2023 10:23:10 +0200
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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@redhat.com>
>>>> Reported-by: kernel test robot <lkp@intel.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