[alexshi:lru_lock 7/8] mm/swap.c:195:9: sparse: sparse: context imbalance in 'pagevec_lru_move_fn' - different lock contexts for basic block

[alexshi:lru_lock 7/8] mm/swap.c:195:9: sparse: sparse: context imbalance in 'pagevec_lru_move_fn' - different lock contexts for basic block

[kbuild test robot]

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tree:   https://github.com/alexshi/linux.git lru_lock
head:   d03a77d1e054236bd7c3f7457fd146e24402fbb4
commit: 4f788884a80ef855964db17f9d989d1c89c8df19 [7/8] mm/lru: likely enhancement
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.1-29-g781bc5d-dirty
        git checkout 4f788884a80ef855964db17f9d989d1c89c8df19
        make ARCH=x86_64 allmodconfig
        make C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__'

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@intel.com>


sparse warnings: (new ones prefixed by >>)

>> mm/swap.c:195:9: sparse: sparse: context imbalance in 'pagevec_lru_move_fn' - different lock contexts for basic block
--
>> mm/vmscan.c:4339:9: sparse: sparse: context imbalance in 'check_move_unevictable_pages' - different lock contexts for basic block
--
>> mm/mlock.c:301:9: sparse: sparse: context imbalance in '__munlock_pagevec' - different lock contexts for basic block
   include/linux/mm.h:1740:21: sparse: sparse: context imbalance in '__munlock_pagevec_fill' - different lock contexts for basic block

vim +/pagevec_lru_move_fn +195 mm/swap.c

18022c5d8627a7 Mel Gorman     2012-07-31  187  
3dd7ae8ec0ef39 Shaohua Li     2011-03-22  188  static void pagevec_lru_move_fn(struct pagevec *pvec,
fa9add641b1b1c Hugh Dickins   2012-05-29  189  	void (*move_fn)(struct page *page, struct lruvec *lruvec, void *arg),
3dd7ae8ec0ef39 Shaohua Li     2011-03-22  190  	void *arg)
902aaed0d983df Hisashi Hifumi 2007-10-16  191  {
902aaed0d983df Hisashi Hifumi 2007-10-16  192  	int i;
72d78985c61081 Alex Shi       2019-10-29  193  	struct lruvec *lruvec = NULL;
902aaed0d983df Hisashi Hifumi 2007-10-16  194  
902aaed0d983df Hisashi Hifumi 2007-10-16 @195  	for (i = 0; i < pagevec_count(pvec); i++) {
902aaed0d983df Hisashi Hifumi 2007-10-16  196  		struct page *page = pvec->pages[i];
902aaed0d983df Hisashi Hifumi 2007-10-16  197  
fef3748b0f0dbf Alex Shi       2019-11-11  198  		lruvec = relock_page_lruvec_irqsave(page, lruvec);
3dd7ae8ec0ef39 Shaohua Li     2011-03-22  199  
fa9add641b1b1c Hugh Dickins   2012-05-29  200  		(*move_fn)(page, lruvec, arg);
902aaed0d983df Hisashi Hifumi 2007-10-16  201  	}
fef3748b0f0dbf Alex Shi       2019-11-11  202  	if (lruvec)
fef3748b0f0dbf Alex Shi       2019-11-11  203  		spin_unlock_irqrestore(&lruvec->lru_lock, lruvec->flags);
72d78985c61081 Alex Shi       2019-10-29  204  
c6f92f9fbe7dbc Mel Gorman     2017-11-15  205  	release_pages(pvec->pages, pvec->nr);
3dd7ae8ec0ef39 Shaohua Li     2011-03-22  206  	pagevec_reinit(pvec);
3dd7ae8ec0ef39 Shaohua Li     2011-03-22  207  }
3dd7ae8ec0ef39 Shaohua Li     2011-03-22  208  

:::::: The code at line 195 was first introduced by commit
:::::: 902aaed0d983dfd459fcb2b678608d4584782200 mm: use pagevec to rotate reclaimable page

:::::: TO: Hisashi Hifumi <hifumi.hisashi@oss.ntt.co.jp>
:::::: CC: Linus Torvalds <torvalds@woody.linux-foundation.org>

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