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authorDavid Sterba <dsterba@suse.com>2019-10-01 19:57:37 +0200
committerDavid Sterba <dsterba@suse.com>2019-11-18 12:46:52 +0100
commit4143cb8b6f00910e73a7503fd922211b9f08cf48 (patch)
tree6e61a1f2ac756102f27cf4dc9a0ca19359259c81 /fs/btrfs/ctree.h
parentbtrfs: add __cold attribute to more functions (diff)
downloadlinux-dev-4143cb8b6f00910e73a7503fd922211b9f08cf48.tar.xz
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btrfs: add const function attribute
For some reason the attribute is called __attribute_const__ and not __const, marks functions that have no observable effects on program state, IOW not reading pointers, just the arguments and calculating a value. Allows the compiler to do some optimizations, based on -Wsuggest-attribute=const . The effects are rather small, though, about 60 bytes decrese of btrfs.ko. Reviewed-by: Nikolay Borisov <nborisov@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs/ctree.h')
-rw-r--r--fs/btrfs/ctree.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index b23fb083a1d5..8d7ac1cd49b4 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -3141,7 +3141,7 @@ __cold
void __btrfs_handle_fs_error(struct btrfs_fs_info *fs_info, const char *function,
unsigned int line, int errno, const char *fmt, ...);
-const char *btrfs_decode_error(int errno);
+const char * __attribute_const__ btrfs_decode_error(int errno);
__cold
void __btrfs_abort_transaction(struct btrfs_trans_handle *trans,