[kdave-btrfs-devel:misc-next 105/114] fs/btrfs/zstd.c:98: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst

[kernel test robot <lkp@xxxxxxxxx>]

tree:   https://github.com/kdave/btrfs-devel.git misc-next
head:   550a34e972578538fd0826916ae4fc407b62bb68
commit: b672526e2ee9352854d286f400122f7690f70970 [105/114] btrfs: use non-bh spin_lock in zstd timer callback
config: parisc-buildonly-randconfig-r005-20220414 (https://download.01.org/0day-ci/archive/20220415/202204151928.EdPKEQ9z-lkp@xxxxxxxxx/config)
compiler: hppa64-linux-gcc (GCC) 11.2.0
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://github.com/kdave/btrfs-devel/commit/b672526e2ee9352854d286f400122f7690f70970
        git remote add kdave-btrfs-devel https://github.com/kdave/btrfs-devel.git
        git fetch --no-tags kdave-btrfs-devel misc-next
        git checkout b672526e2ee9352854d286f400122f7690f70970
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=parisc64 SHELL=/bin/bash fs/btrfs/

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All warnings (new ones prefixed by >>):

>> fs/btrfs/zstd.c:98: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst
    * Timer callback to free unused workspaces.


vim +98 fs/btrfs/zstd.c

    96	
    97	/**
  > 98	 * Timer callback to free unused workspaces.
    99	 *
   100	 * @t: timer
   101	 *
   102	 * This scans the lru_list and attempts to reclaim any workspace that hasn't
   103	 * been used for ZSTD_BTRFS_RECLAIM_JIFFIES.
   104	 *
   105	 * The context is softirq and does not need the _bh locking primitives.
   106	 */
   107	static void zstd_reclaim_timer_fn(struct timer_list *timer)
   108	{
   109		unsigned long reclaim_threshold = jiffies - ZSTD_BTRFS_RECLAIM_JIFFIES;
   110		struct list_head *pos, *next;
   111	
   112		spin_lock(&wsm.lock);
   113	
   114		if (list_empty(&wsm.lru_list)) {
   115			spin_unlock(&wsm.lock);
   116			return;
   117		}
   118	
   119		list_for_each_prev_safe(pos, next, &wsm.lru_list) {
   120			struct workspace *victim = container_of(pos, struct workspace,
   121								lru_list);
   122			unsigned int level;
   123	
   124			if (time_after(victim->last_used, reclaim_threshold))
   125				break;
   126	
   127			/* workspace is in use */
   128			if (victim->req_level)
   129				continue;
   130	
   131			level = victim->level;
   132			list_del(&victim->lru_list);
   133			list_del(&victim->list);
   134			zstd_free_workspace(&victim->list);
   135	
   136			if (list_empty(&wsm.idle_ws[level - 1]))
   137				clear_bit(level - 1, &wsm.active_map);
   138	
   139		}
   140	
   141		if (!list_empty(&wsm.lru_list))
   142			mod_timer(&wsm.timer, jiffies + ZSTD_BTRFS_RECLAIM_JIFFIES);
   143	
   144		spin_unlock(&wsm.lock);
   145	}
   146	

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