[linux-next:master 3032/3150] mm/huge_memory.c:2345:7: warning: variable 'unmap_success' set but not used

[kernel test robot <lkp@intel.com>]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   cd557f1c605fc5a2c0eb0b540610f50dc67dd849
commit: 69cc52577e67f437b4faaa2024faa279fabd2904 [3032/3150] mm: thp: check total_mapcount instead of page_mapcount
config: i386-randconfig-r006-20210517 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=69cc52577e67f437b4faaa2024faa279fabd2904
        git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
        git fetch --no-tags linux-next master
        git checkout 69cc52577e67f437b4faaa2024faa279fabd2904
        # save the attached .config to linux build tree
        make W=1 W=1 ARCH=i386 

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

All warnings (new ones prefixed by >>):

   mm/huge_memory.c: In function 'unmap_page':
>> mm/huge_memory.c:2345:7: warning: variable 'unmap_success' set but not used [-Wunused-but-set-variable]
    2345 |  bool unmap_success;
         |       ^~~~~~~~~~~~~
   mm/huge_memory.c: In function 'split_huge_page_to_list':
>> mm/huge_memory.c:2663:6: warning: variable 'count' set but not used [-Wunused-but-set-variable]
    2663 |  int count, mapcount, extra_pins, ret;
         |      ^~~~~


vim +/unmap_success +2345 mm/huge_memory.c

e9b61f19858a5d Kirill A. Shutemov 2016-01-15  2340  
906f9cdfc2a080 Hugh Dickins       2018-11-30  2341  static void unmap_page(struct page *page)
e9b61f19858a5d Kirill A. Shutemov 2016-01-15  2342  {
013339df116c2e Shakeel Butt       2020-12-14  2343  	enum ttu_flags ttu_flags = TTU_IGNORE_MLOCK |
c7ab0d2fdc8402 Kirill A. Shutemov 2017-02-24  2344  		TTU_RMAP_LOCKED | TTU_SPLIT_HUGE_PMD;
666e5a406c3ed5 Minchan Kim        2017-05-03 @2345  	bool unmap_success;
e9b61f19858a5d Kirill A. Shutemov 2016-01-15  2346  
e9b61f19858a5d Kirill A. Shutemov 2016-01-15  2347  	VM_BUG_ON_PAGE(!PageHead(page), page);
e9b61f19858a5d Kirill A. Shutemov 2016-01-15  2348  
baa355fd331424 Kirill A. Shutemov 2016-07-26  2349  	if (PageAnon(page))
b5ff8161e37cef Naoya Horiguchi    2017-09-08  2350  		ttu_flags |= TTU_SPLIT_FREEZE;
baa355fd331424 Kirill A. Shutemov 2016-07-26  2351  
666e5a406c3ed5 Minchan Kim        2017-05-03  2352  	unmap_success = try_to_unmap(page, ttu_flags);
e9b61f19858a5d Kirill A. Shutemov 2016-01-15  2353  }
e9b61f19858a5d Kirill A. Shutemov 2016-01-15  2354  

:::::: The code at line 2345 was first introduced by commit
:::::: 666e5a406c3ed562e7b3ceff8b631b6067bdaead mm: make ttu's return boolean

:::::: TO: Minchan Kim <minchan@kernel.org>
:::::: CC: Linus Torvalds <torvalds@linux-foundation.org>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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