linux-kernel - Re: kernel/trace/rv/monitors/wip/wip.c:20:1: sparse: sparse: symbol 'da_mon_wip' was not declared. Should it be static?

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Date:   Mon, 22 Aug 2022 10:43:54 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     kernel test robot <lkp@...el.com>
Cc:     Daniel Bristot de Oliveira <bristot@...nel.org>,
        kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org
Subject: Re: kernel/trace/rv/monitors/wip/wip.c:20:1: sparse: sparse: symbol
 'da_mon_wip' was not declared. Should it be static?

On Sun, 21 Aug 2022 03:57:25 +0800
kernel test robot <lkp@...el.com> wrote:

> Hi Stephen,
> 

I don't know who this "Stephen" is. There's no-one on the Cc list named
that.

> First bad commit (maybe != root cause):
> 
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   50cd95ac46548429e5bba7ca75cc97d11a697947
> commit: 10bde81c74863472047f31304064018c40f488ee rv/monitor: Add the wip monitor
> date:   3 weeks ago
> config: arm64-randconfig-s032-20220820 (https://download.01.org/0day-ci/archive/20220821/202208210332.gtHXje45-lkp@intel.com/config)
> compiler: aarch64-linux-gcc (GCC) 12.1.0
> reproduce:
>         wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>         chmod +x ~/bin/make.cross
>         # apt-get install sparse
>         # sparse version: v0.6.4-39-gce1a6720-dirty
>         # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=10bde81c74863472047f31304064018c40f488ee
>         git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
>         git fetch --no-tags linus master
>         git checkout 10bde81c74863472047f31304064018c40f488ee
>         # save the config file
>         mkdir build_dir && cp config build_dir/.config
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=arm64 SHELL=/bin/bash kernel/trace/rv/
> 
> If you fix the issue, kindly add following tag where applicable
> Reported-by: kernel test robot <lkp@...el.com>
> 
> sparse warnings: (new ones prefixed by >>)
>    kernel/trace/rv/monitors/wip/wip.c: note: in included file:
>    kernel/trace/rv/monitors/wip/wip.h:30:22: sparse: sparse: symbol 'automaton_wip' was not declared. Should it be static?

So we have:


   struct automaton_wip automaton_wip = {

Which is used only in the one file that includes it. I'm guessing it should
be static. Daniel?

-- Steve


> 
> vim +/da_mon_wip +20 kernel/trace/rv/monitors/wip/wip.c
> 
> 8812d21219b9c6 Daniel Bristot de Oliveira 2022-07-29  18  
> 8812d21219b9c6 Daniel Bristot de Oliveira 2022-07-29  19  struct rv_monitor rv_wip;
> 8812d21219b9c6 Daniel Bristot de Oliveira 2022-07-29 @20  DECLARE_DA_MON_PER_CPU(wip, unsigned char);
> 8812d21219b9c6 Daniel Bristot de Oliveira 2022-07-29  21  
> 
> :::::: The code at line 20 was first introduced by commit
> :::::: 8812d21219b9c649dd25eb93915e00939944aeb7 rv/monitor: Add the wip monitor skeleton created by dot2k
> 
> :::::: TO: Daniel Bristot de Oliveira <bristot@...nel.org>
> :::::: CC: Steven Rostedt (Google) <rostedt@...dmis.org>
>