We can hit unused variable warnings when btrfs_debug and friends are
just aliases for no_printk. This is due to the fs_info not getting
consumed by the function call, which can happen if convenenience
variables are used. This patch adds a new btrfs_no_printk static inline
that consumes the convenience variable and does nothing else. It
silences the unused variable warning and has no impact on the generated
code:
$ size fs/btrfs/extent_io.o*
text data bss dec hex filename
44072 152 32 44256 ace0 fs/btrfs/extent_io.o.btrfs_no_printk
44072 152 32 44256 ace0 fs/btrfs/extent_io.o.no_printk
Fixes: 27a0dd61a5 (Btrfs: make btrfs_debug match pr_debug handling related to DEBUG)
Signed-off-by: Jeff Mahoney <jeffm@xxxxxxxx>
---
fs/btrfs/ctree.h | 14 ++++++++++----
1 file changed, 10 insertions(+), 4 deletions(-)
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index b967af5..e51ee72 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -3241,6 +3241,12 @@ int btrfs_sync_fs(struct super_block *sb, int wait);
#ifdef CONFIG_PRINTK
__printf(2, 3)
void btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...);
+__printf(2, 3)
+static inline int btrfs_no_printk(const struct btrfs_fs_info *fs_info,
+ const char *fmt, ...)
+{
+ return 0;
+}
#else
static inline __printf(2, 3)
void btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...)
@@ -3355,13 +3361,13 @@ do { \
btrfs_printk_ratelimited(fs_info, KERN_DEBUG fmt, ##args)
#else
#define btrfs_debug(fs_info, fmt, args...) \
- no_printk(KERN_DEBUG fmt, ##args)
+ btrfs_no_printk(fs_info, KERN_DEBUG fmt, ##args)
#define btrfs_debug_in_rcu(fs_info, fmt, args...) \
- no_printk(KERN_DEBUG fmt, ##args)
+ btrfs_no_printk(fs_info, KERN_DEBUG fmt, ##args)
#define btrfs_debug_rl_in_rcu(fs_info, fmt, args...) \
- no_printk(KERN_DEBUG fmt, ##args)
+ btrfs_no_printk(fs_info, KERN_DEBUG fmt, ##args)
#define btrfs_debug_rl(fs_info, fmt, args...) \
- no_printk(KERN_DEBUG fmt, ##args)
+ btrfs_no_printk(fs_info, KERN_DEBUG fmt, ##args)
#endif
#define btrfs_printk_in_rcu(fs_info, fmt, args...) \
--
2.7.1
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