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authorMatthew Wilcox <willy@infradead.org>2017-12-01 22:13:06 -0500
committerMatthew Wilcox <willy@infradead.org>2018-10-21 10:46:40 -0400
commit7b8d046fba91d62beb8a8f78244aaa3c23a60cdd (patch)
tree78f7d338690a358a6b67f5e153506feda90eb8bd /mm/shmem.c
parent552446a4166189a8c2515571dd6e25fd64a2dc78 (diff)
downloadlinux-7b8d046fba91d62beb8a8f78244aaa3c23a60cdd.tar.bz2
shmem: Convert shmem_alloc_hugepage to XArray
xa_find() is a slightly easier API to use than radix_tree_gang_lookup_slot() because it contains its own RCU locking. This commit removes the last user of radix_tree_gang_lookup_slot() so remove the function too. Signed-off-by: Matthew Wilcox <willy@infradead.org>
Diffstat (limited to 'mm/shmem.c')
-rw-r--r--mm/shmem.c14
1 files changed, 4 insertions, 10 deletions
diff --git a/mm/shmem.c b/mm/shmem.c
index 8633bd3dc433..608c9252248f 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -1431,23 +1431,17 @@ static struct page *shmem_alloc_hugepage(gfp_t gfp,
struct shmem_inode_info *info, pgoff_t index)
{
struct vm_area_struct pvma;
- struct inode *inode = &info->vfs_inode;
- struct address_space *mapping = inode->i_mapping;
- pgoff_t idx, hindex;
- void __rcu **results;
+ struct address_space *mapping = info->vfs_inode.i_mapping;
+ pgoff_t hindex;
struct page *page;
if (!IS_ENABLED(CONFIG_TRANSPARENT_HUGE_PAGECACHE))
return NULL;
hindex = round_down(index, HPAGE_PMD_NR);
- rcu_read_lock();
- if (radix_tree_gang_lookup_slot(&mapping->i_pages, &results, &idx,
- hindex, 1) && idx < hindex + HPAGE_PMD_NR) {
- rcu_read_unlock();
+ if (xa_find(&mapping->i_pages, &hindex, hindex + HPAGE_PMD_NR - 1,
+ XA_PRESENT))
return NULL;
- }
- rcu_read_unlock();
shmem_pseudo_vma_init(&pvma, info, hindex);
page = alloc_pages_vma(gfp | __GFP_COMP | __GFP_NORETRY | __GFP_NOWARN,