Btrfs: use plain page_address() in header fields setget functions

We've stopped using highmem for extent buffers.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>

diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 884293642a6c7b523eb671982a3605a7fe8b7b37..8b99c79ad1a7312331fde119768aade07459997b 100644 (file)
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -1415,17 +1415,15 @@ void btrfs_set_##name(struct extent_buffer *eb, type *s, u##bits val);
 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits)            \
 static inline u##bits btrfs_##name(struct extent_buffer *eb)           \
 {                                                                      \
-       type *p = kmap_atomic(eb->first_page, KM_USER0);                \
+       type *p = page_address(eb->first_page);                         \
        u##bits res = le##bits##_to_cpu(p->member);                     \
-       kunmap_atomic(p, KM_USER0);                                     \
        return res;                                                     \
 }                                                                      \
 static inline void btrfs_set_##name(struct extent_buffer *eb,          \
                                    u##bits val)                        \
 {                                                                      \
-       type *p = kmap_atomic(eb->first_page, KM_USER0);                \
+       type *p = page_address(eb->first_page);                         \
        p->member = cpu_to_le##bits(val);                               \
-       kunmap_atomic(p, KM_USER0);                                     \
 }
 
 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits)             \