tree: git://git.cmpxchg.org/linux-mmotm.git master
head: 8276ddb3c638602509386f1a05f75326dbf5ce09
commit: 4ec7a28189776a031d4e7f8ee8581c0db9f96847 [110/211] mm/ZONE_DEVICE/unaddressable: add support for un-addressable device memory
config: i386-randconfig-s1-201711 (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
git checkout 4ec7a28189776a031d4e7f8ee8581c0db9f96847
# save the attached .config to linux build tree
make ARCH=i386
All warnings (new ones prefixed by >>):
In file included from mm/shmem.c:34:0:
mm/shmem.c: In function 'shmem_free_swap':
include/linux/swap.h:450:55: warning: value computed is not used [-Wunused-value]
#define free_swap_and_cache(e) (is_migration_entry(e) || is_device_entry(e))
^
>> mm/shmem.c:646:2: note: in expansion of macro 'free_swap_and_cache'
free_swap_and_cache(radix_to_swp_entry(radswap));
^~~~~~~~~~~~~~~~~~~
vim +/free_swap_and_cache +646 mm/shmem.c
6922c0c7 Hugh Dickins 2011-08-03 630 BUG_ON(error);
6922c0c7 Hugh Dickins 2011-08-03 631 }
6922c0c7 Hugh Dickins 2011-08-03 632
6922c0c7 Hugh Dickins 2011-08-03 633 /*
7a5d0fbb Hugh Dickins 2011-08-03 634 * Remove swap entry from radix tree, free the swap and its page cache.
7a5d0fbb Hugh Dickins 2011-08-03 635 */
7a5d0fbb Hugh Dickins 2011-08-03 636 static int shmem_free_swap(struct address_space *mapping,
7a5d0fbb Hugh Dickins 2011-08-03 637 pgoff_t index, void *radswap)
7a5d0fbb Hugh Dickins 2011-08-03 638 {
6dbaf22c Johannes Weiner 2014-04-03 639 void *old;
7a5d0fbb Hugh Dickins 2011-08-03 640
7a5d0fbb Hugh Dickins 2011-08-03 641 spin_lock_irq(&mapping->tree_lock);
6dbaf22c Johannes Weiner 2014-04-03 642 old = radix_tree_delete_item(&mapping->page_tree, index, radswap);
7a5d0fbb Hugh Dickins 2011-08-03 643 spin_unlock_irq(&mapping->tree_lock);
6dbaf22c Johannes Weiner 2014-04-03 644 if (old != radswap)
6dbaf22c Johannes Weiner 2014-04-03 645 return -ENOENT;
7a5d0fbb Hugh Dickins 2011-08-03 @646 free_swap_and_cache(radix_to_swp_entry(radswap));
6dbaf22c Johannes Weiner 2014-04-03 647 return 0;
7a5d0fbb Hugh Dickins 2011-08-03 648 }
7a5d0fbb Hugh Dickins 2011-08-03 649
7a5d0fbb Hugh Dickins 2011-08-03 650 /*
6a15a370 Vlastimil Babka 2016-01-14 651 * Determine (in bytes) how many of the shmem object's pages mapped by the
48131e03 Vlastimil Babka 2016-01-14 652 * given offsets are swapped out.
6a15a370 Vlastimil Babka 2016-01-14 653 *
6a15a370 Vlastimil Babka 2016-01-14 654 * This is safe to call without i_mutex or mapping->tree_lock thanks to RCU,
:::::: The code at line 646 was first introduced by commit
:::::: 7a5d0fbb29936fad7f17b1cb001b0c33a5f13328 tmpfs: convert shmem_truncate_range to radix-swap
:::::: TO: Hugh Dickins <hughd@xxxxxxxxxx>
:::::: CC: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
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