Hi Yang,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on kdave/for-next]
[also build test ERROR on v5.12-rc2 next-20210309]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    
https://github.com/0day-ci/linux/commits/Yang-Li/btrfs-turn-btrfs_destroy_delayed_refs-into-void-function/20210309-173510
base:   https://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux.git for-next
config: riscv-allyesconfig (attached as .config)
compiler: riscv64-linux-gcc (GCC) 9.3.0
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://github.com/0day-ci/linux/commit/bad3b2a4dc5b9bc5b6584b104c9b13210e6b739a
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review 
Yang-Li/btrfs-turn-btrfs_destroy_delayed_refs-into-void-function/20210309-173510
        git checkout bad3b2a4dc5b9bc5b6584b104c9b13210e6b739a
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross 
ARCH=riscv 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <l...@intel.com>

All errors (new ones prefixed by >>):

   fs/btrfs/disk-io.c: In function 'btrfs_destroy_delayed_refs':
>> fs/btrfs/disk-io.c:4612:10: error: 'ret' undeclared (first use in this 
>> function); did you mean 'ref'?
    4612 |   return ret;
         |          ^~~
         |          ref
   fs/btrfs/disk-io.c:4612:10: note: each undeclared identifier is reported 
only once for each function it appears in
   fs/btrfs/disk-io.c:4612:10: error: 'return' with a value, in function 
returning void [-Werror=return-type]
   fs/btrfs/disk-io.c:4599:13: note: declared here
    4599 | static void btrfs_destroy_delayed_refs(struct btrfs_transaction 
*trans,
         |             ^~~~~~~~~~~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors


vim +4612 fs/btrfs/disk-io.c

acce952b026382 liubo           2011-01-06  4598  
bad3b2a4dc5b9b Yang Li         2021-03-09  4599  static void 
btrfs_destroy_delayed_refs(struct btrfs_transaction *trans,
2ff7e61e0d30ff Jeff Mahoney    2016-06-22  4600                                 
      struct btrfs_fs_info *fs_info)
acce952b026382 liubo           2011-01-06  4601  {
acce952b026382 liubo           2011-01-06  4602         struct rb_node *node;
acce952b026382 liubo           2011-01-06  4603         struct 
btrfs_delayed_ref_root *delayed_refs;
acce952b026382 liubo           2011-01-06  4604         struct 
btrfs_delayed_ref_node *ref;
acce952b026382 liubo           2011-01-06  4605  
acce952b026382 liubo           2011-01-06  4606         delayed_refs = 
&trans->delayed_refs;
acce952b026382 liubo           2011-01-06  4607  
acce952b026382 liubo           2011-01-06  4608         
spin_lock(&delayed_refs->lock);
d7df2c796d7eed Josef Bacik     2014-01-23  4609         if 
(atomic_read(&delayed_refs->num_entries) == 0) {
cfece4db110dac David Sterba    2011-04-25  4610                 
spin_unlock(&delayed_refs->lock);
b79ce3dddd3f1b David Sterba    2019-11-28  4611                 
btrfs_debug(fs_info, "delayed_refs has NO entry");
acce952b026382 liubo           2011-01-06 @4612                 return ret;
acce952b026382 liubo           2011-01-06  4613         }
acce952b026382 liubo           2011-01-06  4614  
5c9d028b3b174e Liu Bo          2018-08-23  4615         while ((node = 
rb_first_cached(&delayed_refs->href_root)) != NULL) {
d7df2c796d7eed Josef Bacik     2014-01-23  4616                 struct 
btrfs_delayed_ref_head *head;
0e0adbcfdc9086 Josef Bacik     2017-10-19  4617                 struct rb_node 
*n;
e78417d1921c53 Josef Bacik     2013-06-03  4618                 bool pin_bytes 
= false;
acce952b026382 liubo           2011-01-06  4619  
d7df2c796d7eed Josef Bacik     2014-01-23  4620                 head = 
rb_entry(node, struct btrfs_delayed_ref_head,
d7df2c796d7eed Josef Bacik     2014-01-23  4621                                 
href_node);
3069bd26690a01 Josef Bacik     2018-11-21  4622                 if 
(btrfs_delayed_ref_lock(delayed_refs, head))
b939d1ab76b4aa Josef Bacik     2012-05-31  4623                         
continue;
3069bd26690a01 Josef Bacik     2018-11-21  4624  
d7df2c796d7eed Josef Bacik     2014-01-23  4625                 
spin_lock(&head->lock);
e3d03965638428 Liu Bo          2018-08-23  4626                 while ((n = 
rb_first_cached(&head->ref_tree)) != NULL) {
0e0adbcfdc9086 Josef Bacik     2017-10-19  4627                         ref = 
rb_entry(n, struct btrfs_delayed_ref_node,
0e0adbcfdc9086 Josef Bacik     2017-10-19  4628                                 
       ref_node);
d7df2c796d7eed Josef Bacik     2014-01-23  4629                         
ref->in_tree = 0;
e3d03965638428 Liu Bo          2018-08-23  4630                         
rb_erase_cached(&ref->ref_node, &head->ref_tree);
0e0adbcfdc9086 Josef Bacik     2017-10-19  4631                         
RB_CLEAR_NODE(&ref->ref_node);
1d57ee941692d0 Wang Xiaoguang  2016-10-26  4632                         if 
(!list_empty(&ref->add_list))
1d57ee941692d0 Wang Xiaoguang  2016-10-26  4633                                 
list_del(&ref->add_list);
d7df2c796d7eed Josef Bacik     2014-01-23  4634                         
atomic_dec(&delayed_refs->num_entries);
d7df2c796d7eed Josef Bacik     2014-01-23  4635                         
btrfs_put_delayed_ref(ref);
d7df2c796d7eed Josef Bacik     2014-01-23  4636                 }
54067ae95e1547 Josef Bacik     2013-04-25  4637                 if 
(head->must_insert_reserved)
e78417d1921c53 Josef Bacik     2013-06-03  4638                         
pin_bytes = true;
78a6184a3ff904 Miao Xie        2012-11-21  4639                 
btrfs_free_delayed_extent_op(head->extent_op);
fa781cea3d6a2b Josef Bacik     2018-11-21  4640                 
btrfs_delete_ref_head(delayed_refs, head);
d7df2c796d7eed Josef Bacik     2014-01-23  4641                 
spin_unlock(&head->lock);
acce952b026382 liubo           2011-01-06  4642                 
spin_unlock(&delayed_refs->lock);
e78417d1921c53 Josef Bacik     2013-06-03  4643                 
mutex_unlock(&head->mutex);
acce952b026382 liubo           2011-01-06  4644  
f603bb94abbed5 Nikolay Borisov 2020-01-20  4645                 if (pin_bytes) {
f603bb94abbed5 Nikolay Borisov 2020-01-20  4646                         struct 
btrfs_block_group *cache;
f603bb94abbed5 Nikolay Borisov 2020-01-20  4647  
f603bb94abbed5 Nikolay Borisov 2020-01-20  4648                         cache = 
btrfs_lookup_block_group(fs_info, head->bytenr);
f603bb94abbed5 Nikolay Borisov 2020-01-20  4649                         
BUG_ON(!cache);
f603bb94abbed5 Nikolay Borisov 2020-01-20  4650  
f603bb94abbed5 Nikolay Borisov 2020-01-20  4651                         
spin_lock(&cache->space_info->lock);
f603bb94abbed5 Nikolay Borisov 2020-01-20  4652                         
spin_lock(&cache->lock);
f603bb94abbed5 Nikolay Borisov 2020-01-20  4653                         
cache->pinned += head->num_bytes;
f603bb94abbed5 Nikolay Borisov 2020-01-20  4654                         
btrfs_space_info_update_bytes_pinned(fs_info,
f603bb94abbed5 Nikolay Borisov 2020-01-20  4655                                 
cache->space_info, head->num_bytes);
f603bb94abbed5 Nikolay Borisov 2020-01-20  4656                         
cache->reserved -= head->num_bytes;
f603bb94abbed5 Nikolay Borisov 2020-01-20  4657                         
cache->space_info->bytes_reserved -= head->num_bytes;
f603bb94abbed5 Nikolay Borisov 2020-01-20  4658                         
spin_unlock(&cache->lock);
f603bb94abbed5 Nikolay Borisov 2020-01-20  4659                         
spin_unlock(&cache->space_info->lock);
f603bb94abbed5 Nikolay Borisov 2020-01-20  4660                         
percpu_counter_add_batch(
f603bb94abbed5 Nikolay Borisov 2020-01-20  4661                                 
&cache->space_info->total_bytes_pinned,
f603bb94abbed5 Nikolay Borisov 2020-01-20  4662                                 
head->num_bytes, BTRFS_TOTAL_BYTES_PINNED_BATCH);
f603bb94abbed5 Nikolay Borisov 2020-01-20  4663  
f603bb94abbed5 Nikolay Borisov 2020-01-20  4664                         
btrfs_put_block_group(cache);
f603bb94abbed5 Nikolay Borisov 2020-01-20  4665  
f603bb94abbed5 Nikolay Borisov 2020-01-20  4666                         
btrfs_error_unpin_extent_range(fs_info, head->bytenr,
f603bb94abbed5 Nikolay Borisov 2020-01-20  4667                                 
head->bytenr + head->num_bytes - 1);
f603bb94abbed5 Nikolay Borisov 2020-01-20  4668                 }
31890da0bfdd24 Josef Bacik     2018-11-21  4669                 
btrfs_cleanup_ref_head_accounting(fs_info, delayed_refs, head);
d278850eff3053 Josef Bacik     2017-09-29  4670                 
btrfs_put_delayed_ref_head(head);
acce952b026382 liubo           2011-01-06  4671                 cond_resched();
acce952b026382 liubo           2011-01-06  4672                 
spin_lock(&delayed_refs->lock);
acce952b026382 liubo           2011-01-06  4673         }
81f7eb00ff5bb8 Jeff Mahoney    2020-02-11  4674         
btrfs_qgroup_destroy_extent_records(trans);
acce952b026382 liubo           2011-01-06  4675  
acce952b026382 liubo           2011-01-06  4676         
spin_unlock(&delayed_refs->lock);
acce952b026382 liubo           2011-01-06  4677  }
acce952b026382 liubo           2011-01-06  4678  

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-...@lists.01.org

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