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shmem: Convert shmem_free_swap to XArray 

Since we are conditionally storing NULL in the XArray, we do not need
to allocate memory and the GFP flags will be unused.

Signed-off-by: Matthew Wilcox <willy@infradead.org>
This commit is contained in:
Matthew Wilcox 2017-12-04 03:13:54 -05:00
parent 7b8d046fba
commit c121d3bb71
1 changed files with 2 additions and 2 deletions
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4
mm/shmem.c
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@ -650,7 +650,7 @@ static void shmem_delete_from_page_cache(struct page *page, void *radswap)
}
/*
* Remove swap entry from radix tree, free the swap and its page cache.
* Remove swap entry from page cache, free the swap and its page cache.
*/
static int shmem_free_swap(struct address_space *mapping,
pgoff_t index, void *radswap)
@ -658,7 +658,7 @@ static int shmem_free_swap(struct address_space *mapping,
void *old;
xa_lock_irq(&mapping->i_pages);
old = radix_tree_delete_item(&mapping->i_pages, index, radswap);
old = __xa_cmpxchg(&mapping->i_pages, index, radswap, NULL, 0);
xa_unlock_irq(&mapping->i_pages);
if (old != radswap)
return -ENOENT;