drm/amdgpu: add VEGAM VCE firmware support

[linux.git] / mm / shmem.c

diff --git a/mm/shmem.c b/mm/shmem.c
index 1907688b75ee0110253f3d96e1e3d7ea02433a2a..b859192433998a14096629b53ac5297a6a0dd2bb 100644 (file)
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -493,36 +493,45 @@ static unsigned long shmem_unused_huge_shrink(struct shmem_sb_info *sbinfo,
                info = list_entry(pos, struct shmem_inode_info, shrinklist);
                inode = &info->vfs_inode;
 
-               if (nr_to_split && split >= nr_to_split) {
-                       iput(inode);
-                       continue;
-               }
+               if (nr_to_split && split >= nr_to_split)
+                       goto leave;
 
-               page = find_lock_page(inode->i_mapping,
+               page = find_get_page(inode->i_mapping,
                                (inode->i_size & HPAGE_PMD_MASK) >> PAGE_SHIFT);
                if (!page)
                        goto drop;
 
+               /* No huge page at the end of the file: nothing to split */
                if (!PageTransHuge(page)) {
-                       unlock_page(page);
                        put_page(page);
                        goto drop;
                }
 
+               /*
+                * Leave the inode on the list if we failed to lock
+                * the page at this time.
+                *
+                * Waiting for the lock may lead to deadlock in the
+                * reclaim path.
+                */
+               if (!trylock_page(page)) {
+                       put_page(page);
+                       goto leave;
+               }
+
                ret = split_huge_page(page);
                unlock_page(page);
                put_page(page);
 
-               if (ret) {
-                       /* split failed: leave it on the list */
-                       iput(inode);
-                       continue;
-               }
+               /* If split failed leave the inode on the list */
+               if (ret)
+                       goto leave;
 
                split++;
 drop:
                list_del_init(&info->shrinklist);
                removed++;
+leave:
                iput(inode);
        }