[PATCH] btrfs: make array types static const, reduces object code size

From: Colin King
Date: Tue Sep 19 2017 - 11:01:35 EST


From: Colin Ian King <colin.king@xxxxxxxxxxxxx>

Don't populate the read-only array types on the stack, instead make
it static const. Makes the object code smaller by nearly 60 bytes:

Before:
text data bss dec hex filename
90536 6552 64 97152 17b80 fs/btrfs/ioctl.o

After:
text data bss dec hex filename
90414 6616 64 97094 17b46 fs/btrfs/ioctl.o

Signed-off-by: Colin Ian King <colin.king@xxxxxxxxxxxxx>
---
fs/btrfs/ioctl.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index a74ed6c12d6a..feab6f61cb97 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -4114,10 +4114,12 @@ static long btrfs_ioctl_space_info(struct btrfs_fs_info *fs_info,
struct btrfs_ioctl_space_info *dest_orig;
struct btrfs_ioctl_space_info __user *user_dest;
struct btrfs_space_info *info;
- u64 types[] = {BTRFS_BLOCK_GROUP_DATA,
- BTRFS_BLOCK_GROUP_SYSTEM,
- BTRFS_BLOCK_GROUP_METADATA,
- BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA};
+ static const u64 types[] = {
+ BTRFS_BLOCK_GROUP_DATA,
+ BTRFS_BLOCK_GROUP_SYSTEM,
+ BTRFS_BLOCK_GROUP_METADATA,
+ BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA
+ };
int num_types = 4;
int alloc_size;
int ret = 0;
--
2.14.1