[mmotm:master 78/178] mm/madvise.c:161:190: warning: value computed is not used

[mmotm:master 78/178] mm/madvise.c:161:190: warning: value computed is not used

[kbuild test robot]

tree:   git://git.cmpxchg.org/linux-mmotm.git master
head:   a621774e0e7bbd9e8a024230af4704cc489bd40e
commit: ef99d21ea4a246e56b9a55de5740655d30735f33 [78/178] madvise: cleanup swapin_walk_pmd_entry()
config: make ARCH=i386 defconfig

All warnings:

   mm/madvise.c: In function 'swapin_walk_pte_entry':
>> mm/madvise.c:161:190: warning: value computed is not used [-Wunused-value]
     pte_offset_map(walk->pmd, start & PMD_MASK);
                                                                                                                                                                                                 ^

vim +161 mm/madvise.c

   145		pte_t *orig_pte = pte - ((start & (PMD_SIZE - 1)) >> PAGE_SHIFT);
   146		swp_entry_t entry;
   147		struct page *page;
   148	
   149		ptent = *pte;
   150		pte_unmap_unlock(orig_pte, walk->ptl);
   151		if (pte_present(ptent) || pte_none(ptent) || pte_file(ptent))
   152			goto lock;
   153		entry = pte_to_swp_entry(ptent);
   154		if (unlikely(non_swap_entry(entry)))
   155			goto lock;
   156		page = read_swap_cache_async(entry, GFP_HIGHUSER_MOVABLE,
   157					     walk->vma, start);
   158		if (page)
   159			page_cache_release(page);
   160	lock:
 > 161		pte_offset_map(walk->pmd, start & PMD_MASK);
   162		spin_lock(walk->ptl);
   163		return 0;
   164	}
   165	
   166	static void force_swapin_readahead(struct vm_area_struct *vma,
   167			unsigned long start, unsigned long end)
   168	{
   169		struct mm_walk walk = {

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