x86/mce/therm_throt: Mark throttle_active_work() as __maybe_unused

throttle_active_work() is only called if CONFIG_SYSFS is set, otherwise
we get a harmless warning:

  arch/x86/kernel/cpu/mce/therm_throt.c:238:13: error: 'throttle_active_work' \
	  defined but not used [-Werror=unused-function]

Mark the function as __maybe_unused to avoid the warning.

Fixes: f665620 ("x86/mce/therm_throt: Optimize notifications of thermal throttle")
Signed-off-by: Arnd Bergmann <[email protected]>
Signed-off-by: Borislav Petkov <[email protected]>
Reviewed-by: Srinivas Pandruvada <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: Greg Kroah-Hartman <[email protected]>
Cc: [email protected]
Cc: "H. Peter Anvin" <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: linux-edac <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Tony Luck <[email protected]>
Cc: x86-ml <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]

Author: arndb

arch/x86/kernel/cpu/mce/therm_throt.c

@@ -235,7 +235,7 @@ static void get_therm_status(int level, bool *proc_hot, u8 *temp)
 	*temp = (msr_val >> 16) & 0x7F;
 }
 
-static void throttle_active_work(struct work_struct *work)
+static void __maybe_unused throttle_active_work(struct work_struct *work)
 {
 	struct _thermal_state *state = container_of(to_delayed_work(work),
 						struct _thermal_state, therm_work);