linux-kernel - Re: [PATCH 07/15] mm/ZONE_DEVICE: new type of ZONE

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Date:   Sat, 1 Jul 2017 08:16:37 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Jérôme Glisse <jglisse@...hat.com>
Cc:     kbuild-all@...org, akpm@...ux-foundation.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        John Hubbard <jhubbard@...dia.com>,
        Dan Williams <dan.j.williams@...el.com>,
        David Nellans <dnellans@...dia.com>,
        Jérôme Glisse <jglisse@...hat.com>,
        Ross Zwisler <ross.zwisler@...ux.intel.com>
Subject: Re: [PATCH 07/15] mm/ZONE_DEVICE: new type of ZONE_DEVICE for
 unaddressable memory v4

Hi Jérôme,

[auto build test WARNING on mmotm/master]
[also build test WARNING on next-20170630]
[cannot apply to linus/master v4.12-rc7]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/J-r-me-Glisse/HMM-Heterogeneous-Memory-Management-v24/20170629-232809
base:   git://git.cmpxchg.org/linux-mmotm.git master
config: x86_64-randconfig-a0-07010546 (attached as .config)
compiler: gcc-4.4 (Debian 4.4.7-8) 4.4.7
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All warnings (new ones prefixed by >>):

   mm/shmem.c: In function 'shmem_free_swap':
>> mm/shmem.c:647: warning: value computed is not used
--
   mm/madvise.c: In function 'madvise_free_pte_range':
>> mm/madvise.c:341: warning: value computed is not used

vim +647 mm/shmem.c

6922c0c7 Hugh Dickins    2011-08-03  631  	BUG_ON(error);
6922c0c7 Hugh Dickins    2011-08-03  632  }
6922c0c7 Hugh Dickins    2011-08-03  633  
6922c0c7 Hugh Dickins    2011-08-03  634  /*
7a5d0fbb Hugh Dickins    2011-08-03  635   * Remove swap entry from radix tree, free the swap and its page cache.
7a5d0fbb Hugh Dickins    2011-08-03  636   */
7a5d0fbb Hugh Dickins    2011-08-03  637  static int shmem_free_swap(struct address_space *mapping,
7a5d0fbb Hugh Dickins    2011-08-03  638  			   pgoff_t index, void *radswap)
7a5d0fbb Hugh Dickins    2011-08-03  639  {
6dbaf22c Johannes Weiner 2014-04-03  640  	void *old;
7a5d0fbb Hugh Dickins    2011-08-03  641  
7a5d0fbb Hugh Dickins    2011-08-03  642  	spin_lock_irq(&mapping->tree_lock);
6dbaf22c Johannes Weiner 2014-04-03  643  	old = radix_tree_delete_item(&mapping->page_tree, index, radswap);
7a5d0fbb Hugh Dickins    2011-08-03  644  	spin_unlock_irq(&mapping->tree_lock);
6dbaf22c Johannes Weiner 2014-04-03  645  	if (old != radswap)
6dbaf22c Johannes Weiner 2014-04-03  646  		return -ENOENT;
7a5d0fbb Hugh Dickins    2011-08-03 @647  	free_swap_and_cache(radix_to_swp_entry(radswap));
6dbaf22c Johannes Weiner 2014-04-03  648  	return 0;
7a5d0fbb Hugh Dickins    2011-08-03  649  }
7a5d0fbb Hugh Dickins    2011-08-03  650  
7a5d0fbb Hugh Dickins    2011-08-03  651  /*
6a15a370 Vlastimil Babka 2016-01-14  652   * Determine (in bytes) how many of the shmem object's pages mapped by the
48131e03 Vlastimil Babka 2016-01-14  653   * given offsets are swapped out.
6a15a370 Vlastimil Babka 2016-01-14  654   *
6a15a370 Vlastimil Babka 2016-01-14  655   * This is safe to call without i_mutex or mapping->tree_lock thanks to RCU,

:::::: The code at line 647 was first introduced by commit
:::::: 7a5d0fbb29936fad7f17b1cb001b0c33a5f13328 tmpfs: convert shmem_truncate_range to radix-swap

:::::: TO: Hugh Dickins <hughd@...gle.com>
:::::: CC: Linus Torvalds <torvalds@...ux-foundation.org>

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