Arend van Spriel [off-list ref] writes:

+ Randy

On 7/13/2018 9:03 AM, YueHaibing wrote:

quoted

When CONFIG_PROC_FS isn't set, gcc warning this:

drivers/net/wireless/intersil/hostap/hostap_hw.c:2901:12: warning: ‘prism2_registers_proc_show’ defined but not used [-Wunused-function]
  static int prism2_registers_proc_show(struct seq_file *m, void *v)

drivers/net/wireless/intersil/hostap/hostap_proc.c:16:12: warning: ‘prism2_debug_proc_show’ defined but not used [-Wunused-function]
  static int prism2_debug_proc_show(struct seq_file *m, void *v)
             ^
drivers/net/wireless/intersil/hostap/hostap_proc.c:49:12: warning: ‘prism2_stats_proc_show’ defined but not used [-Wunused-function]
  static int prism2_stats_proc_show(struct seq_file *m, void *v)
             ^
drivers/net/wireless/intersil/hostap/hostap_proc.c:177:12: warning: ‘prism2_crypt_proc_show’ defined but not used [-Wunused-function]
  static int prism2_crypt_proc_show(struct seq_file *m, void *v)
             ^

fix this by adding #ifdef around them.
hfa384x_read_reg is only used by prism2_registers_proc_show,so move it
into #ifdef.

There was already a fix for this posted by Randy Dunlap taking a
different approach, ie. use __maybe_unused classifier. To be honest I
prefer the ifdef approach as it is more explicit and does not feel
like a cheat.

I also prefer the ifdef approach more so I'm planning to take this
patch.

-- 
Kalle Valo