[linux-next:master 13597/13716] fs/bcachefs/btree_write_buffer.c:128:24: warning: unused variable 'c'

[linux-next:master 13597/13716] fs/bcachefs/btree_write_buffer.c:128:24: warning: unused variable 'c'

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   943b9f0ab2cfbaea148dd6ac279957eb08b96904
commit: 3e76edb0f4db19fca9ee02a6c163a670bc66fa2c [13597/13716] bcachefs: Prep work for variable size btree node buffers
config: x86_64-buildonly-randconfig-003-20240117 (https://download.01.org/0day-ci/archive/20240117/202401172139.XSfsNhrJ-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240117/202401172139.XSfsNhrJ-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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202401172139.XSfsNhrJ-lkp@intel.com/

All warnings (new ones prefixed by >>):

   fs/bcachefs/btree_write_buffer.c: In function 'wb_flush_one':
>> fs/bcachefs/btree_write_buffer.c:128:24: warning: unused variable 'c' [-Wunused-variable]
     128 |         struct bch_fs *c = trans->c;
         |                        ^


vim +/c +128 fs/bcachefs/btree_write_buffer.c

ab4fb4b678c378 Kent Overstreet 2023-11-26  123  
ab4fb4b678c378 Kent Overstreet 2023-11-26  124  static inline int wb_flush_one(struct btree_trans *trans, struct btree_iter *iter,
920e69bc3db88d Kent Overstreet 2023-01-04  125  			       struct btree_write_buffered_key *wb,
ab4fb4b678c378 Kent Overstreet 2023-11-26  126  			       bool *write_locked, size_t *fast)
920e69bc3db88d Kent Overstreet 2023-01-04  127  {
920e69bc3db88d Kent Overstreet 2023-01-04 @128  	struct bch_fs *c = trans->c;
920e69bc3db88d Kent Overstreet 2023-01-04  129  	struct btree_path *path;
920e69bc3db88d Kent Overstreet 2023-01-04  130  	int ret;
920e69bc3db88d Kent Overstreet 2023-01-04  131  
ab4fb4b678c378 Kent Overstreet 2023-11-26  132  	EBUG_ON(!wb->journal_seq);
09caeabe1a5daa Kent Overstreet 2023-11-02  133  	EBUG_ON(!c->btree_write_buffer.flushing.pin.seq);
09caeabe1a5daa Kent Overstreet 2023-11-02  134  	EBUG_ON(c->btree_write_buffer.flushing.pin.seq > wb->journal_seq);
09caeabe1a5daa Kent Overstreet 2023-11-02  135  
920e69bc3db88d Kent Overstreet 2023-01-04  136  	ret = bch2_btree_iter_traverse(iter);
920e69bc3db88d Kent Overstreet 2023-01-04  137  	if (ret)
920e69bc3db88d Kent Overstreet 2023-01-04  138  		return ret;
920e69bc3db88d Kent Overstreet 2023-01-04  139  
e17b93eb36729c Kent Overstreet 2023-11-07  140  	/*
e17b93eb36729c Kent Overstreet 2023-11-07  141  	 * We can't clone a path that has write locks: unshare it now, before
e17b93eb36729c Kent Overstreet 2023-11-07  142  	 * set_pos and traverse():
e17b93eb36729c Kent Overstreet 2023-11-07  143  	 */
07f383c71fadc9 Kent Overstreet 2023-12-04  144  	if (btree_iter_path(trans, iter)->ref > 1)
07f383c71fadc9 Kent Overstreet 2023-12-04  145  		iter->path = __bch2_btree_path_make_mut(trans, iter->path, true, _THIS_IP_);
e17b93eb36729c Kent Overstreet 2023-11-07  146  
07f383c71fadc9 Kent Overstreet 2023-12-04  147  	path = btree_iter_path(trans, iter);
920e69bc3db88d Kent Overstreet 2023-01-04  148  
920e69bc3db88d Kent Overstreet 2023-01-04  149  	if (!*write_locked) {
920e69bc3db88d Kent Overstreet 2023-01-04  150  		ret = bch2_btree_node_lock_write(trans, path, &path->l[0].b->c);
920e69bc3db88d Kent Overstreet 2023-01-04  151  		if (ret)
920e69bc3db88d Kent Overstreet 2023-01-04  152  			return ret;
920e69bc3db88d Kent Overstreet 2023-01-04  153  
920e69bc3db88d Kent Overstreet 2023-01-04  154  		bch2_btree_node_prep_for_write(trans, path, path->l[0].b);
920e69bc3db88d Kent Overstreet 2023-01-04  155  		*write_locked = true;
920e69bc3db88d Kent Overstreet 2023-01-04  156  	}
920e69bc3db88d Kent Overstreet 2023-01-04  157  
3e76edb0f4db19 Kent Overstreet 2024-01-16  158  	if (unlikely(!bch2_btree_node_insert_fits(path->l[0].b, wb->k.k.u64s))) {
920e69bc3db88d Kent Overstreet 2023-01-04  159  		*write_locked = false;
ab4fb4b678c378 Kent Overstreet 2023-11-26  160  		return wb_flush_one_slowpath(trans, iter, wb);
920e69bc3db88d Kent Overstreet 2023-01-04  161  	}
920e69bc3db88d Kent Overstreet 2023-01-04  162  
920e69bc3db88d Kent Overstreet 2023-01-04  163  	bch2_btree_insert_key_leaf(trans, path, &wb->k, wb->journal_seq);
920e69bc3db88d Kent Overstreet 2023-01-04  164  	(*fast)++;
920e69bc3db88d Kent Overstreet 2023-01-04  165  	return 0;
920e69bc3db88d Kent Overstreet 2023-01-04  166  }
920e69bc3db88d Kent Overstreet 2023-01-04  167  

:::::: The code at line 128 was first introduced by commit
:::::: 920e69bc3db88d3825c69190cafd43f0a1918d3b bcachefs: Btree write buffer

:::::: TO: Kent Overstreet <kent.overstreet@linux.dev>
:::::: CC: Kent Overstreet <kent.overstreet@linux.dev>

-- 
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https://github.com/intel/lkp-tests/wiki