linux-kernel - drivers/md/dm-vdo/int-map.c:87: error: Cannot parse struct or union!

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Message-ID: <202407141607.M3E2XQ0Z-lkp@intel.com>
Date: Sun, 14 Jul 2024 17:00:08 +0800
From: kernel test robot <lkp@...el.com>
To: Mike Snitzer <snitzer@...nel.org>
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
	linux-kernel@...r.kernel.org, Matthew Sakai <msakai@...hat.com>
Subject: drivers/md/dm-vdo/int-map.c:87: error: Cannot parse struct or union!

Hi Mike,

First bad commit (maybe != root cause):

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   4d145e3f830ba2c2745b42bfba5c2f8fcb8d078a
commit: f36b1d3ba533d21b5b793623f05761b0297d114e dm vdo: use a proper Makefile for dm-vdo
date:   5 months ago
config: s390-allmodconfig (https://download.01.org/0day-ci/archive/20240714/202407141607.M3E2XQ0Z-lkp@intel.com/config)
compiler: clang version 19.0.0git (https://github.com/llvm/llvm-project a0c6b8aef853eedaa0980f07c0a502a5a8a9740e)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240714/202407141607.M3E2XQ0Z-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/202407141607.M3E2XQ0Z-lkp@intel.com/

All errors (new ones prefixed by >>):

>> drivers/md/dm-vdo/int-map.c:87: error: Cannot parse struct or union!
   drivers/md/dm-vdo/int-map.c:105: warning: Function parameter or struct member 'bucket_count' not described in 'int_map'
   drivers/md/dm-vdo/int-map.c:330: warning: Function parameter or struct member '__always_unused' not described in 'search_hop_list'
   drivers/md/dm-vdo/int-map.c:330: warning: Excess function parameter 'map' description in 'search_hop_list'
   drivers/md/dm-vdo/int-map.c:461: warning: Function parameter or struct member '__always_unused' not described in 'move_empty_bucket'
   drivers/md/dm-vdo/int-map.c:461: warning: Excess function parameter 'map' description in 'move_empty_bucket'


vim +87 drivers/md/dm-vdo/int-map.c

cc46b9554b3f6d Matthew Sakai 2023-11-16  66  
cc46b9554b3f6d Matthew Sakai 2023-11-16  67  /**
cc46b9554b3f6d Matthew Sakai 2023-11-16  68   * struct bucket - hash bucket
cc46b9554b3f6d Matthew Sakai 2023-11-16  69   *
cc46b9554b3f6d Matthew Sakai 2023-11-16  70   * Buckets are packed together to reduce memory usage and improve cache efficiency. It would be
cc46b9554b3f6d Matthew Sakai 2023-11-16  71   * tempting to encode the hop offsets separately and maintain alignment of key/value pairs, but
cc46b9554b3f6d Matthew Sakai 2023-11-16  72   * it's crucial to keep the hop fields near the buckets that they use them so they'll tend to share
cc46b9554b3f6d Matthew Sakai 2023-11-16  73   * cache lines.
cc46b9554b3f6d Matthew Sakai 2023-11-16  74   */
cc46b9554b3f6d Matthew Sakai 2023-11-16  75  struct __packed bucket {
cc46b9554b3f6d Matthew Sakai 2023-11-16  76  	/**
cc46b9554b3f6d Matthew Sakai 2023-11-16  77  	 * @first_hop: The biased offset of the first entry in the hop list of the neighborhood
cc46b9554b3f6d Matthew Sakai 2023-11-16  78  	 *             that hashes to this bucket.
cc46b9554b3f6d Matthew Sakai 2023-11-16  79  	 */
cc46b9554b3f6d Matthew Sakai 2023-11-16  80  	u8 first_hop;
cc46b9554b3f6d Matthew Sakai 2023-11-16  81  	/** @next_hop: The biased offset of the next bucket in the hop list. */
cc46b9554b3f6d Matthew Sakai 2023-11-16  82  	u8 next_hop;
cc46b9554b3f6d Matthew Sakai 2023-11-16  83  	/** @key: The key stored in this bucket. */
cc46b9554b3f6d Matthew Sakai 2023-11-16  84  	u64 key;
cc46b9554b3f6d Matthew Sakai 2023-11-16  85  	/** @value: The value stored in this bucket (NULL if empty). */
cc46b9554b3f6d Matthew Sakai 2023-11-16  86  	void *value;
cc46b9554b3f6d Matthew Sakai 2023-11-16 @87  };
cc46b9554b3f6d Matthew Sakai 2023-11-16  88  

:::::: The code at line 87 was first introduced by commit
:::::: cc46b9554b3f6d2f09b1111386b2706e5b4f56c8 dm vdo: add basic hash map data structures

:::::: TO: Matthew Sakai <msakai@...hat.com>
:::::: CC: Mike Snitzer <snitzer@...nel.org>

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