The kernel would like to have all stack VLA usage removed[1].
Unfortunately using an integer constant variable as the size of an
array is still considered a VLA. Instead let's use directly sizeof(var)
which removes the VLA usage. Use the occasion to remove csum_size
altogether and use sizeof() also for the size passed to memcmp

[1]: https://lkml.org/lkml/2018/3/7/621

Signed-off-by: Nikolay Borisov <nbori...@suse.com>
---

V2: 
 * Use sizeof(result) in memcmp to make it more clear what we are comparing. 
 fs/btrfs/disk-io.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 3809d6d66f6a..04834cb65272 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -403,8 +403,7 @@ static int btrfs_check_super_csum(struct btrfs_fs_info 
*fs_info,
 
        if (csum_type == BTRFS_CSUM_TYPE_CRC32) {
                u32 crc = ~(u32)0;
-               const int csum_size = sizeof(crc);
-               char result[csum_size];
+               char result[sizeof(crc)];
 
                /*
                 * The super_block structure does not span the whole
@@ -415,7 +414,7 @@ static int btrfs_check_super_csum(struct btrfs_fs_info 
*fs_info,
                                crc, BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
                btrfs_csum_final(crc, result);
 
-               if (memcmp(raw_disk_sb, result, csum_size))
+               if (memcmp(raw_disk_sb, result, sizeof(result)))
                        ret = 1;
        }
 
-- 
2.7.4

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