linux-kernel - Re: [kbuild-all] Re: [dborkman:pr/bpf-cgrp 2/4] include/linux/cgroup-defs.h:771:70: warning: unused parameter 'skcd'

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Date:   Tue, 14 Sep 2021 12:05:06 +0800
From:   Rong Chen <rong.a.chen@...el.com>
To:     Nathan Chancellor <nathan@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>
Cc:     kernel test robot <lkp@...el.com>, llvm@...ts.linux.dev,
        kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        alexei.starovoitov@...il.com, andrii@...nel.org
Subject: Re: [kbuild-all] Re: [dborkman:pr/bpf-cgrp 2/4]
 include/linux/cgroup-defs.h:771:70: warning: unused parameter 'skcd'



On 9/14/21 2:00 AM, Nathan Chancellor wrote:
> Hi Daniel,
>
> On Mon, Sep 13, 2021 at 05:19:26PM +0200, Daniel Borkmann wrote:
>> [ +Philip ]
>>
>> On 9/11/21 2:38 AM, kernel test robot wrote:
>>> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/dborkman/bpf.git pr/bpf-cgrp
>>> head:   5a6e78baee7515884b93a90c5d03db601bc9063a
>>> commit: f36377d0c40cce0cdeaff50031c268bc640d94f0 [2/4] bpf, cgroups: Fix cgroup v2 fallback on v1/v2 mixed mode
>>> config: i386-randconfig-r032-20210910 (attached as .config)
>>> compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 261cbe98c38f8c1ee1a482fe76511110e790f58a)
>>> reproduce (this is a W=1 build):
>>>           wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>>>           chmod +x ~/bin/make.cross
>>>           # https://git.kernel.org/pub/scm/linux/kernel/git/dborkman/bpf.git/commit/?id=f36377d0c40cce0cdeaff50031c268bc640d94f0
>>>           git remote add dborkman https://git.kernel.org/pub/scm/linux/kernel/git/dborkman/bpf.git
>>>           git fetch --no-tags dborkman pr/bpf-cgrp
>>>           git checkout f36377d0c40cce0cdeaff50031c268bc640d94f0
>>>           # save the attached .config to linux build tree
>>>           COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=i386
>>>
>>> If you fix the issue, kindly add following tag as appropriate
>>> Reported-by: kernel test robot <lkp@...el.com>
>>>
>>> All warnings (new ones prefixed by >>):
>> Not sure how useful these warnings below are given it is quite conventional in the kernel
>> to have some static inline helper which e.g. look:
>>
>> static inline int bla(struct foo *bar)
>> {
>> #ifdef CONFIG_<XYZ>
>>          return ... /// do something with bar
>> #else
>>          return 0;
>> #endif
>> }
>>
>> I presume consensus here is to ignore these given also the gazillion other cases in the
>> kernel tree. In other words, goal on -Wunused-parameter for kernel would be to really
>> only catch cases where a parameter is indeed in all cases unused and should be removed
>> from the signature.
> Unfortunately, it looks like you are getting bit by a tangential issue
> here:
>
> https://lore.kernel.org/r/YSQE2f5teuvKLkON@Ryzen-9-3900X.localdomain/
>
> The full include log:
>
> In file included from drivers/gpu/drm/i915/display/intel_dpll.c:7:
> In file included from drivers/gpu/drm/i915/display/intel_de.h:9:
> In file included from ./drivers/gpu/drm/i915/i915_drv.h:39:
> In file included from ./include/linux/i2c.h:18:
> In file included from ./include/linux/regulator/consumer.h:35:
> In file included from ./include/linux/suspend.h:5:
> In file included from ./include/linux/swap.h:9:
> In file included from ./include/linux/memcontrol.h:13:
> In file included from ./include/linux/cgroup.h:28:
> In file included from ./include/linux/cgroup-defs.h:22:
> In file included from ./include/linux/bpf-cgroup.h:5:
> ./include/linux/bpf.h:770:61: warning: unused parameter 'prog' [-Wunused-parameter]
> static inline int bpf_trampoline_link_prog(struct bpf_prog *prog,
>                                                              ^
> ./include/linux/bpf.h:771:32: warning: unused parameter 'tr' [-Wunused-parameter]
>                                             struct bpf_trampoline *tr)
>                                                                    ^
> ...
>
> The fixes are here:
>
> https://lore.kernel.org/r/20210824022640.2170859-1-nathan@kernel.org/
> https://lore.kernel.org/r/20210824232237.2085342-1-nathan@kernel.org/
>
> I will push to get these fixes accepted as quickly as possible.
>
> Philip, would it be possible for you guys to avoid sending reports for
> i386 configurations that contain any of the following three
> configurations for the time being?
>
> CONFIG_MCRUSOE=y
> CONFIG_MEFFICEON=y
> CONFIG_MCYRIXIII=y
>
> They are resulting in a lot of false positives, as I have linked above.

Hi Nathan,

Thanks for the advice, we have disabled these config.

Best Regards,
Rong Chen

>
> Cheers,
> Nathan
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