linux-kernel - Re: [printk:for-5.15-printk-index 4/5] kernel/printk/index.c:140:6: warning: no previous prototype for 'pi_create

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Date:   Fri, 23 Jul 2021 13:19:47 +0200
From:   Petr Mladek <pmladek@...e.com>
To:     Chris Down <chris@...isdown.name>
Cc:     kernel test robot <lkp@...el.com>, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org
Subject: Re: [printk:for-5.15-printk-index 4/5] kernel/printk/index.c:140:6:
 warning: no previous prototype for 'pi_create_file'

On Tue 2021-07-20 13:02:33, Chris Down wrote:
> kernel test robot writes:
> > tree:   https://git.kernel.org/pub/scm/linux/kernel/git/printk/linux.git for-5.15-printk-index
> > head:   ad7d61f159db73974f1b0352f21afe04b0bbd920
> > commit: 337015573718b161891a3473d25f59273f2e626b [4/5] printk: Userspace format indexing support
> > config: arc-allyesconfig (attached as .config)
> > compiler: arceb-elf-gcc (GCC) 10.3.0
> > 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/printk/linux.git/commit/?id=337015573718b161891a3473d25f59273f2e626b
> >        git remote add printk https://git.kernel.org/pub/scm/linux/kernel/git/printk/linux.git
> >        git fetch --no-tags printk for-5.15-printk-index
> >        git checkout 337015573718b161891a3473d25f59273f2e626b
> >        # save the attached .config to linux build tree
> >        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-10.3.0 make.cross ARCH=arc
> > 
> > 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 >>):
> > 
> > > > kernel/printk/index.c:140:6: warning: no previous prototype for 'pi_create_file' [-Wmissing-prototypes]
> >     140 | void pi_create_file(struct module *mod)
> >         |      ^~~~~~~~~~~~~~
> > > > kernel/printk/index.c:146:6: warning: no previous prototype for 'pi_remove_file' [-Wmissing-prototypes]
> >     146 | void pi_remove_file(struct module *mod)
> >         |      ^~~~~~~~~~~~~~
> 
> Ah, I missed `static inline', which causes the compiler to think we want to
> export it even though we don't.
> 
> diff --git kernel/printk/index.c kernel/printk/index.c
> index ca062f5e1779..e340e0a8b847 100644
> --- kernel/printk/index.c
> +++ kernel/printk/index.c
> @@ -137,13 +137,13 @@ static const char *pi_get_module_name(struct module *mod)
>  }
>  #endif
> -void pi_create_file(struct module *mod)
> +static inline void pi_create_file(struct module *mod)
>  {
>  	debugfs_create_file(pi_get_module_name(mod), 0444, dfs_index,
>  				       mod, &dfs_index_fops);
>  }
> -void pi_remove_file(struct module *mod)
> +static inline void pi_remove_file(struct module *mod)
>  {
>  	debugfs_remove(debugfs_lookup(pi_get_module_name(mod), dfs_index));
>  }

I have just pushed this fix into printk/linux.git,
branch for-5.15-printk-index.

Well, I just added the "static" keyword. Let the compiler decide
about inlining. There is no need to enforce it.

Best Regards,
Petr