Use the existing offsetof() macro instead of duplicating code.

Signed-off-by: Zheng Yongjun <[email protected]>
---
 fs/f2fs/node.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index d5d8ce077f29..000cafb522ec 100644
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -2686,7 +2686,7 @@ int f2fs_recover_inode_page(struct f2fs_sb_info *sbi, 
struct page *page)
        src = F2FS_INODE(page);
        dst = F2FS_INODE(ipage);
 
-       memcpy(dst, src, (unsigned long)&src->i_ext - (unsigned long)src);
+       memcpy(dst, src, offsetof(struct f2fs_inode, i_ext));
        dst->i_size = 0;
        dst->i_blocks = cpu_to_le64(1);
        dst->i_links = cpu_to_le32(1);
-- 
2.22.0

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