ext4: remove dynamic array size in ext4_chksum()

The ext4_checksum() inline function was using a dynamic array size,
which is not legal C.  (It is a gcc extension).

Remove it.

Cc: "Darrick J. Wong" <djwong@us.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

1 files changed, 3 insertions, 1 deletions

diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 1610e808ebe3..e8e8afa402f1 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -1667,10 +1667,12 @@ static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc,
 {
         struct {
                 struct shash_desc shash;
-                char ctx[crypto_shash_descsize(sbi->s_chksum_driver)];
+                char ctx[4];
         } desc;
         int err;
 
+        BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx));
+
         desc.shash.tfm = sbi->s_chksum_driver;
         desc.shash.flags = 0;
         *(u32 *)desc.ctx = crc;