linux-kernel - Re: kernel/user_namespace.c:239: warning: Function parameter or member 'map_up' not described in 'idmap

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Date:   Mon, 28 Aug 2023 22:13:06 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     kernel test robot <lkp@...el.com>,
        Christian Brauner <brauner@...nel.org>
Cc:     oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux Memory Management List <linux-mm@...ck.org>
Subject: Re: kernel/user_namespace.c:239: warning: Function parameter or
 member 'map_up' not described in 'idmap_key'

Hi Christian,

On 8/17/23 05:56, kernel test robot wrote:
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   4853c74bd7ab7fdb83f319bd9ace8a08c031e9b6
> commit: e227db4d4f125efb1cae2f1337da85bc10b3185e userns: fix a struct's kernel-doc notation
> date:   7 months ago
> config: parisc64-defconfig (https://download.01.org/0day-ci/archive/20230817/202308172003.O1QB7TgB-lkp@intel.com/config)
> compiler: hppa64-linux-gcc (GCC) 12.3.0
> reproduce: (https://download.01.org/0day-ci/archive/20230817/202308172003.O1QB7TgB-lkp@intel.com/reproduce)
> 
> If you fix the issue in a separate patch/commit (i.e. not just a new version of
> the same patch/commit), kindly add following tags
> | Reported-by: kernel test robot <lkp@...el.com>
> | Closes: https://lore.kernel.org/oe-kbuild-all/202308172003.O1QB7TgB-lkp@intel.com/
> 
> All warnings (new ones prefixed by >>):
> 
>>> kernel/user_namespace.c:239: warning: Function parameter or member 'map_up' not described in 'idmap_key'
>>> kernel/user_namespace.c:239: warning: Function parameter or member 'id' not described in 'idmap_key'
>>> kernel/user_namespace.c:239: warning: Function parameter or member 'count' not described in 'idmap_key'
>    kernel/user_namespace.c:246: warning: Function parameter or member 'k' not described in 'cmp_map_id'
>    kernel/user_namespace.c:246: warning: Function parameter or member 'e' not described in 'cmp_map_id'
>    kernel/user_namespace.c:277: warning: Function parameter or member 'extents' not described in 'map_id_range_down_max'
>    kernel/user_namespace.c:277: warning: Function parameter or member 'map' not described in 'map_id_range_down_max'
>    kernel/user_namespace.c:277: warning: Function parameter or member 'id' not described in 'map_id_range_down_max'
>    kernel/user_namespace.c:277: warning: Function parameter or member 'count' not described in 'map_id_range_down_max'
>    kernel/user_namespace.c:295: warning: Function parameter or member 'extents' not described in 'map_id_range_down_base'
>    kernel/user_namespace.c:295: warning: Function parameter or member 'map' not described in 'map_id_range_down_base'
>    kernel/user_namespace.c:295: warning: Function parameter or member 'id' not described in 'map_id_range_down_base'
>    kernel/user_namespace.c:295: warning: Function parameter or member 'count' not described in 'map_id_range_down_base'
>    kernel/user_namespace.c:344: warning: Function parameter or member 'extents' not described in 'map_id_up_base'
>    kernel/user_namespace.c:344: warning: Function parameter or member 'map' not described in 'map_id_up_base'
>    kernel/user_namespace.c:344: warning: Function parameter or member 'id' not described in 'map_id_up_base'
>    kernel/user_namespace.c:364: warning: Function parameter or member 'extents' not described in 'map_id_up_max'
>    kernel/user_namespace.c:364: warning: Function parameter or member 'map' not described in 'map_id_up_max'
>    kernel/user_namespace.c:364: warning: Function parameter or member 'id' not described in 'map_id_up_max'
>    kernel/user_namespace.c:776: warning: Function parameter or member 'map' not described in 'insert_extent'
>    kernel/user_namespace.c:776: warning: Function parameter or member 'extent' not described in 'insert_extent'
>    kernel/user_namespace.c:844: warning: Function parameter or member 'map' not described in 'sort_idmaps'
> 

According to 'git blame', all of these come from additions that you made.

What do you think about a patch that converts all of these into non-kernel-doc comments?
I.e., change "/**" to "/*" for the functions and struct?

> 
> vim +239 kernel/user_namespace.c
> 
> 5c1469de7545a3 Eric W. Biederman 2010-06-13  230  
> 6397fac4915ab3 Christian Brauner 2017-10-25  231  /**
> e227db4d4f125e Randy Dunlap      2023-01-07  232   * struct idmap_key - holds the information necessary to find an idmapping in a
> 6397fac4915ab3 Christian Brauner 2017-10-25  233   * sorted idmap array. It is passed to cmp_map_id() as first argument.
> 6397fac4915ab3 Christian Brauner 2017-10-25  234   */
> 6397fac4915ab3 Christian Brauner 2017-10-25  235  struct idmap_key {
> 6397fac4915ab3 Christian Brauner 2017-10-25  236  	bool map_up; /* true  -> id from kid; false -> kid from id */
> 6397fac4915ab3 Christian Brauner 2017-10-25  237  	u32 id; /* id to find */
> 6397fac4915ab3 Christian Brauner 2017-10-25  238  	u32 count; /* == 0 unless used with map_id_range_down() */
> 6397fac4915ab3 Christian Brauner 2017-10-25 @239  };
> 6397fac4915ab3 Christian Brauner 2017-10-25  240  
> 
> :::::: The code at line 239 was first introduced by commit
> :::::: 6397fac4915ab3002dc15aae751455da1a852f25 userns: bump idmap limits to 340
> 
> :::::: TO: Christian Brauner <christian.brauner@...ntu.com>
> :::::: CC: Eric W. Biederman <ebiederm@...ssion.com>
> 

thanks.
-- 
~Randy