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shmem: Convert shmem_confirm_swap to XArray 

xa_load has its own RCU locking, so we can eliminate it here.

Signed-off-by: Matthew Wilcox <willy@infradead.org>
This commit is contained in:
Matthew Wilcox 2017-11-22 08:34:58 -05:00
parent 62f945b6a7
commit a12831bf42
1 changed files with 1 additions and 6 deletions
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7
mm/shmem.c
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@ -349,12 +349,7 @@ static int shmem_replace_entry(struct address_space *mapping,
static bool shmem_confirm_swap(struct address_space *mapping,
pgoff_t index, swp_entry_t swap)
{
void *item;
rcu_read_lock();
item = radix_tree_lookup(&mapping->i_pages, index);
rcu_read_unlock();
return item == swp_to_radix_entry(swap);
return xa_load(&mapping->i_pages, index) == swp_to_radix_entry(swap);
}
/*