Date:	Thu, 16 Jun 2016 19:42:15 +0800
From:	kbuild test robot <lkp@...el.com>
To:	Jan Kara <jack@...e.cz>
Cc:	kbuild-all@...org, Ted Tso <tytso@....edu>,
	linux-ext4@...r.kernel.org, Eryu Guan <eguan@...hat.com>,
	Jan Kara <jack@...e.cz>
Subject: Re: [PATCH 3/4] jbd2: Move lockdep tracking to journal_s

Hi,

[auto build test WARNING on ext4/dev]
[also build test WARNING on v4.7-rc3 next-20160616]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Jan-Kara/ext4-Fix-deadlock-during-page-writeback/20160616-184851
base:   https://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git dev
reproduce: make htmldocs

All warnings (new ones prefixed by >>):

   include/linux/jbd2.h:442: warning: No description found for parameter 'i_transaction'
   include/linux/jbd2.h:442: warning: No description found for parameter 'i_next_transaction'
   include/linux/jbd2.h:442: warning: No description found for parameter 'i_list'
   include/linux/jbd2.h:442: warning: No description found for parameter 'i_vfs_inode'
   include/linux/jbd2.h:442: warning: No description found for parameter 'i_flags'
   include/linux/jbd2.h:494: warning: No description found for parameter 'h_rsv_handle'
   include/linux/jbd2.h:494: warning: No description found for parameter 'h_reserved'
   include/linux/jbd2.h:494: warning: No description found for parameter 'h_type'
   include/linux/jbd2.h:494: warning: No description found for parameter 'h_line_no'
   include/linux/jbd2.h:494: warning: No description found for parameter 'h_start_jiffies'
   include/linux/jbd2.h:494: warning: No description found for parameter 'h_requested_credits'
   include/linux/jbd2.h:1046: warning: No description found for parameter 'j_chkpt_bhs[JBD2_NR_BATCH]'
   include/linux/jbd2.h:1046: warning: No description found for parameter 'j_devname[BDEVNAME_SIZE+24]'
   include/linux/jbd2.h:1046: warning: No description found for parameter 'j_average_commit_time'
   include/linux/jbd2.h:1046: warning: No description found for parameter 'j_min_batch_time'
   include/linux/jbd2.h:1046: warning: No description found for parameter 'j_max_batch_time'
   include/linux/jbd2.h:1046: warning: No description found for parameter 'j_commit_callback'
   include/linux/jbd2.h:1046: warning: No description found for parameter 'j_failed_commit'
   include/linux/jbd2.h:1046: warning: No description found for parameter 'j_chksum_driver'
   include/linux/jbd2.h:1046: warning: No description found for parameter 'j_csum_seed'
>> include/linux/jbd2.h:1046: warning: No description found for parameter 'j_trans_commit_map'
   fs/jbd2/transaction.c:424: warning: No description found for parameter 'rsv_blocks'
   fs/jbd2/transaction.c:424: warning: No description found for parameter 'gfp_mask'
   fs/jbd2/transaction.c:424: warning: No description found for parameter 'type'
   fs/jbd2/transaction.c:424: warning: No description found for parameter 'line_no'
   fs/jbd2/transaction.c:500: warning: No description found for parameter 'type'
   fs/jbd2/transaction.c:500: warning: No description found for parameter 'line_no'
   fs/jbd2/transaction.c:630: warning: No description found for parameter 'gfp_mask'

vim +/j_trans_commit_map +1046 include/linux/jbd2.h

01b5adce Darrick J. Wong 2012-05-27  1030  	struct crypto_shash *j_chksum_driver;
4fd5ea43 Darrick J. Wong 2012-05-27  1031  
4fd5ea43 Darrick J. Wong 2012-05-27  1032  	/* Precomputed journal UUID checksum for seeding other checksums */
4fd5ea43 Darrick J. Wong 2012-05-27  1033  	__u32 j_csum_seed;
ef50ddbd Jan Kara        2016-06-16  1034  
ef50ddbd Jan Kara        2016-06-16  1035  #ifdef CONFIG_DEBUG_LOCK_ALLOC
ef50ddbd Jan Kara        2016-06-16  1036  	/*
ef50ddbd Jan Kara        2016-06-16  1037  	 * Lockdep entity to track transaction commit dependencies. Handles
ef50ddbd Jan Kara        2016-06-16  1038  	 * hold this "lock" for read, when we wait for commit, we acquire the
ef50ddbd Jan Kara        2016-06-16  1039  	 * "lock" for writing. This matches the properties of jbd2 journalling
ef50ddbd Jan Kara        2016-06-16  1040  	 * where the running transaction has to wait for all handles to be
ef50ddbd Jan Kara        2016-06-16  1041  	 * dropped to commit that transaction and also acquiring a handle may
ef50ddbd Jan Kara        2016-06-16  1042  	 * require transaction commit to finish.
ef50ddbd Jan Kara        2016-06-16  1043  	 */
ef50ddbd Jan Kara        2016-06-16  1044  	struct lockdep_map	j_trans_commit_map;
ef50ddbd Jan Kara        2016-06-16  1045  #endif
470decc6 Dave Kleikamp   2006-10-11 @1046  };
470decc6 Dave Kleikamp   2006-10-11  1047  
56316a0d Darrick J. Wong 2015-10-17  1048  /* journal feature predicate functions */
56316a0d Darrick J. Wong 2015-10-17  1049  #define JBD2_FEATURE_COMPAT_FUNCS(name, flagname) \
56316a0d Darrick J. Wong 2015-10-17  1050  static inline bool jbd2_has_feature_##name(journal_t *j) \
56316a0d Darrick J. Wong 2015-10-17  1051  { \
56316a0d Darrick J. Wong 2015-10-17  1052  	return ((j)->j_format_version >= 2 && \
56316a0d Darrick J. Wong 2015-10-17  1053  		((j)->j_superblock->s_feature_compat & \
56316a0d Darrick J. Wong 2015-10-17  1054  		 cpu_to_be32(JBD2_FEATURE_COMPAT_##flagname)) != 0); \

:::::: The code at line 1046 was first introduced by commit
:::::: 470decc613ab2048b619a01028072d932d9086ee [PATCH] jbd2: initial copy of files from jbd

:::::: TO: Dave Kleikamp <shaggy@...tin.ibm.com>
:::::: CC: Linus Torvalds <torvalds@...osdl.org>

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