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:   Tue, 20 Jul 2021 13:02:33 +0100
From:   Chris Down <chris@...isdown.name>
To:     kernel test robot <lkp@...el.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Petr Mladek <pmladek@...e.com>
Subject: Re: [printk:for-5.15-printk-index 4/5] kernel/printk/index.c:140:6:
 warning: no previous prototype for 'pi_create_file'

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));
  }