linux-kernel - [sbates130272-p2pmem:md-bug-v2 13/17] drivers/md/raid5-cache.c:409:35: sparse: sparse: incorrect type in initializer (different address spaces)

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Date:   Thu, 26 May 2022 20:49:26 +0800
From:   kernel test robot <lkp@...el.com>
To:     Logan Gunthorpe <logang@...tatee.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org
Subject: [sbates130272-p2pmem:md-bug-v2 13/17]
 drivers/md/raid5-cache.c:409:35: sparse: sparse: incorrect type in
 initializer (different address spaces)

tree:   https://github.com/sbates130272/linux-p2pmem.git md-bug-v2
head:   1816687fa5c6ba0cecc43d38a583d2ff56da9597
commit: c6c798f230d28e6ac1e28faa7d255ed7cf5ba3ff [13/17] md/raid5-cache: Add RCU protection to conf->log accesses
config: i386-randconfig-s002 (https://download.01.org/0day-ci/archive/20220526/202205262005.fOq3Ctsn-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.3.0-1) 11.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.4-14-g5a0004b5-dirty
        # https://github.com/sbates130272/linux-p2pmem/commit/c6c798f230d28e6ac1e28faa7d255ed7cf5ba3ff
        git remote add sbates130272-p2pmem https://github.com/sbates130272/linux-p2pmem.git
        git fetch --no-tags sbates130272-p2pmem md-bug-v2
        git checkout c6c798f230d28e6ac1e28faa7d255ed7cf5ba3ff
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=i386 SHELL=/bin/bash drivers/md/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@...el.com>


sparse warnings: (new ones prefixed by >>)
   drivers/md/raid5-cache.c: note: in included file:
   drivers/md/raid5.h:271:14: sparse: sparse: array of flexible structures
>> drivers/md/raid5-cache.c:409:35: sparse: sparse: incorrect type in initializer (different address spaces) @@     expected struct r5l_log *log @@     got struct r5l_log [noderef] __rcu *log @@
   drivers/md/raid5-cache.c:409:35: sparse:     expected struct r5l_log *log
   drivers/md/raid5-cache.c:409:35: sparse:     got struct r5l_log [noderef] __rcu *log
   drivers/md/raid5-cache.c:2668:23: sparse: sparse: incorrect type in assignment (different address spaces) @@     expected void **pslot @@     got void [noderef] __rcu ** @@
   drivers/md/raid5-cache.c:2668:23: sparse:     expected void **pslot
   drivers/md/raid5-cache.c:2668:23: sparse:     got void [noderef] __rcu **
   drivers/md/raid5-cache.c:2672:33: sparse: sparse: incorrect type in argument 1 (different address spaces) @@     expected void [noderef] __rcu **slot @@     got void **pslot @@
   drivers/md/raid5-cache.c:2672:33: sparse:     expected void [noderef] __rcu **slot
   drivers/md/raid5-cache.c:2672:33: sparse:     got void **pslot
   drivers/md/raid5-cache.c:2675:56: sparse: sparse: incorrect type in argument 2 (different address spaces) @@     expected void [noderef] __rcu **slot @@     got void **pslot @@
   drivers/md/raid5-cache.c:2675:56: sparse:     expected void [noderef] __rcu **slot
   drivers/md/raid5-cache.c:2675:56: sparse:     got void **pslot
   drivers/md/raid5-cache.c:2823:23: sparse: sparse: incorrect type in assignment (different address spaces) @@     expected void **pslot @@     got void [noderef] __rcu ** @@
   drivers/md/raid5-cache.c:2823:23: sparse:     expected void **pslot
   drivers/md/raid5-cache.c:2823:23: sparse:     got void [noderef] __rcu **
   drivers/md/raid5-cache.c:2827:25: sparse: sparse: incorrect type in argument 1 (different address spaces) @@     expected void [noderef] __rcu **slot @@     got void **pslot @@
   drivers/md/raid5-cache.c:2827:25: sparse:     expected void [noderef] __rcu **slot
   drivers/md/raid5-cache.c:2827:25: sparse:     got void **pslot
   drivers/md/raid5-cache.c:2833:56: sparse: sparse: incorrect type in argument 2 (different address spaces) @@     expected void [noderef] __rcu **slot @@     got void **pslot @@
   drivers/md/raid5-cache.c:2833:56: sparse:     expected void [noderef] __rcu **slot
   drivers/md/raid5-cache.c:2833:56: sparse:     got void **pslot

vim +409 drivers/md/raid5-cache.c

a39f7afde358ca Song Liu 2016-11-17  401  
2ded370373a400 Song Liu 2016-11-17  402  /*
2ded370373a400 Song Liu 2016-11-17  403   * Put the stripe into writing-out phase by clearing STRIPE_R5C_CACHING.
2ded370373a400 Song Liu 2016-11-17  404   * This function should only be called in write-back mode.
2ded370373a400 Song Liu 2016-11-17  405   */
a39f7afde358ca Song Liu 2016-11-17  406  void r5c_make_stripe_write_out(struct stripe_head *sh)
2ded370373a400 Song Liu 2016-11-17  407  {
2ded370373a400 Song Liu 2016-11-17  408  	struct r5conf *conf = sh->raid_conf;
2ded370373a400 Song Liu 2016-11-17 @409  	struct r5l_log *log = conf->log;
2ded370373a400 Song Liu 2016-11-17  410  
2ded370373a400 Song Liu 2016-11-17  411  	BUG_ON(!r5c_is_writeback(log));
2ded370373a400 Song Liu 2016-11-17  412  
2ded370373a400 Song Liu 2016-11-17  413  	WARN_ON(!test_bit(STRIPE_R5C_CACHING, &sh->state));
2ded370373a400 Song Liu 2016-11-17  414  	clear_bit(STRIPE_R5C_CACHING, &sh->state);
1e6d690b9334b7 Song Liu 2016-11-17  415  
1e6d690b9334b7 Song Liu 2016-11-17  416  	if (!test_and_set_bit(STRIPE_PREREAD_ACTIVE, &sh->state))
1e6d690b9334b7 Song Liu 2016-11-17  417  		atomic_inc(&conf->preread_active_stripes);
1e6d690b9334b7 Song Liu 2016-11-17  418  }
1e6d690b9334b7 Song Liu 2016-11-17  419  

:::::: The code at line 409 was first introduced by commit
:::::: 2ded370373a400c20cf0c6e941e724e61582a867 md/r5cache: State machine for raid5-cache write back mode

:::::: TO: Song Liu <songliubraving@...com>
:::::: CC: Shaohua Li <shli@...com>

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