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btrfs: btrfs_debug should consume fs_info when DEBUG is not defined 

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@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Jeff Mahoney 2016-09-21 12:17:37 -04:00 committed by David Sterba
parent 04ab956ee6
commit c01f5f96f5
1 changed files with 10 additions and 4 deletions
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14
fs/btrfs/ctree.h
View File

@ -3244,6 +3244,12 @@ 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, ...)
@ -3358,13 +3364,13 @@ 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...) \