linux-kernel - [willy-pagecache:for-next 3/81] mm/huge_memory.c:2380:21: warning: incompatible pointer to integer conversion assigning to 'unsigned long' from 'void *'

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Date:   Mon, 20 Jun 2022 02:21:01 +0800
From:   kernel test robot <lkp@...el.com>
To:     "Matthew Wilcox (Oracle)" <willy@...radead.org>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org
Subject: [willy-pagecache:for-next 3/81] mm/huge_memory.c:2380:21: warning:
 incompatible pointer to integer conversion assigning to 'unsigned long' from
 'void *'

tree:   git://git.infradead.org/users/willy/pagecache for-next
head:   a4483039b0e88f52c72975b99ea131a111b35a8e
commit: ddf632ba3fd866d92f0ec9343984c6b2c18a788c [3/81] mm: Clear page->private when splitting or migrating a page
config: s390-randconfig-r033-20220619 (https://download.01.org/0day-ci/archive/20220620/202206200151.WMsNVIYY-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project af6d2a0b6825e71965f3e2701a63c239fa0ad70f)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install s390 cross compiling tool for clang build
        # apt-get install binutils-s390x-linux-gnu
        git remote add willy-pagecache git://git.infradead.org/users/willy/pagecache
        git fetch --no-tags willy-pagecache for-next
        git checkout ddf632ba3fd866d92f0ec9343984c6b2c18a788c
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=s390 SHELL=/bin/bash

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

All warnings (new ones prefixed by >>):

>> mm/huge_memory.c:2380:21: warning: incompatible pointer to integer conversion assigning to 'unsigned long' from 'void *' [-Wint-conversion]
           page_tail->private = NULL;
                              ^ ~~~~
   1 warning generated.


vim +2380 mm/huge_memory.c

  2338	
  2339	static void __split_huge_page_tail(struct page *head, int tail,
  2340			struct lruvec *lruvec, struct list_head *list)
  2341	{
  2342		struct page *page_tail = head + tail;
  2343	
  2344		VM_BUG_ON_PAGE(atomic_read(&page_tail->_mapcount) != -1, page_tail);
  2345	
  2346		/*
  2347		 * Clone page flags before unfreezing refcount.
  2348		 *
  2349		 * After successful get_page_unless_zero() might follow flags change,
  2350		 * for example lock_page() which set PG_waiters.
  2351		 *
  2352		 * Note that for mapped sub-pages of an anonymous THP,
  2353		 * PG_anon_exclusive has been cleared in unmap_page() and is stored in
  2354		 * the migration entry instead from where remap_page() will restore it.
  2355		 * We can still have PG_anon_exclusive set on effectively unmapped and
  2356		 * unreferenced sub-pages of an anonymous THP: we can simply drop
  2357		 * PG_anon_exclusive (-> PG_mappedtodisk) for these here.
  2358		 */
  2359		page_tail->flags &= ~PAGE_FLAGS_CHECK_AT_PREP;
  2360		page_tail->flags |= (head->flags &
  2361				((1L << PG_referenced) |
  2362				 (1L << PG_swapbacked) |
  2363				 (1L << PG_swapcache) |
  2364				 (1L << PG_mlocked) |
  2365				 (1L << PG_uptodate) |
  2366				 (1L << PG_active) |
  2367				 (1L << PG_workingset) |
  2368				 (1L << PG_locked) |
  2369				 (1L << PG_unevictable) |
  2370	#ifdef CONFIG_64BIT
  2371				 (1L << PG_arch_2) |
  2372	#endif
  2373				 (1L << PG_dirty)));
  2374	
  2375		/* ->mapping in first tail page is compound_mapcount */
  2376		VM_BUG_ON_PAGE(tail > 2 && page_tail->mapping != TAIL_MAPPING,
  2377				page_tail);
  2378		page_tail->mapping = head->mapping;
  2379		page_tail->index = head->index + tail;
> 2380		page_tail->private = NULL;
  2381	
  2382		/* Page flags must be visible before we make the page non-compound. */
  2383		smp_wmb();
  2384	
  2385		/*
  2386		 * Clear PageTail before unfreezing page refcount.
  2387		 *
  2388		 * After successful get_page_unless_zero() might follow put_page()
  2389		 * which needs correct compound_head().
  2390		 */
  2391		clear_compound_head(page_tail);
  2392	
  2393		/* Finally unfreeze refcount. Additional reference from page cache. */
  2394		page_ref_unfreeze(page_tail, 1 + (!PageAnon(head) ||
  2395						  PageSwapCache(head)));
  2396	
  2397		if (page_is_young(head))
  2398			set_page_young(page_tail);
  2399		if (page_is_idle(head))
  2400			set_page_idle(page_tail);
  2401	
  2402		page_cpupid_xchg_last(page_tail, page_cpupid_last(head));
  2403	
  2404		/*
  2405		 * always add to the tail because some iterators expect new
  2406		 * pages to show after the currently processed elements - e.g.
  2407		 * migrate_pages
  2408		 */
  2409		lru_add_page_tail(head, page_tail, lruvec, list);
  2410	}
  2411	

-- 
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https://01.org/lkp