[PATCH 1/4] btrfs: inline checksum name and driver definitions

[David Sterba <dsterba@suse.com>]

There's an unnecessary indirection in the checksum definition table,
pointer and the string itself. The strings are short and the overall
size of one entry is now 24 bytes.

Signed-off-by: David Sterba <dsterba@suse.com>
---
 fs/btrfs/ctree.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index f948435e87df..bfedbbe2311f 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -31,8 +31,8 @@ static void del_ptr(struct btrfs_root *root, struct btrfs_path *path,
 
 static const struct btrfs_csums {
 	u16		size;
-	const char	*name;
-	const char	*driver;
+	const char	name[10];
+	const char	driver[12];
 } btrfs_csums[] = {
 	[BTRFS_CSUM_TYPE_CRC32] = { .size = 4, .name = "crc32c" },
 	[BTRFS_CSUM_TYPE_XXHASH] = { .size = 8, .name = "xxhash64" },
@@ -63,7 +63,8 @@ const char *btrfs_super_csum_name(u16 csum_type)
 const char *btrfs_super_csum_driver(u16 csum_type)
 {
 	/* csum type is validated at mount time */
-	return btrfs_csums[csum_type].driver ?:
+	return btrfs_csums[csum_type].driver[0] ?
+		btrfs_csums[csum_type].driver :
 		btrfs_csums[csum_type].name;
 }
 
-- 
2.25.0