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>

diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 1610e808ebe3c256d8cac72222a350b1af2e66d6..e8e8afa402f171188f7382cacdc7d681223ec0bf 100644 (file)
--- 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;