xtensa: drop unused definitions

drop the following unused definitions:
- TS_USEDFPU from arch/xtensa/include/asm/thread_info.h
- current_set from arch/xtensa/kernel/process.c

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>

arch/xtensa/include/asm/thread_info.h

@@ -121,15 +121,6 @@ static inline struct thread_info *current_thread_info(void)
 #define _TIF_WORK_MASK		(_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \
 				 _TIF_SYSCALL_TRACEPOINT)
 
-/*
- * Thread-synchronous status.
- *
- * This is different from the flags in that nobody else
- * ever touches our thread-synchronous status, so we don't
- * have to worry about atomic accesses.
- */
-#define TS_USEDFPU		0x0001	/* FPU was used by this task this quantum (SMP) */
-
 #define THREAD_SIZE KERNEL_STACK_SIZE
 #define THREAD_SIZE_ORDER (KERNEL_STACK_SHIFT - PAGE_SHIFT)
 

arch/xtensa/kernel/process.c

@@ -52,8 +52,6 @@
 extern void ret_from_fork(void);
 extern void ret_from_kernel_thread(void);
 
-struct task_struct *current_set[NR_CPUS] = {&init_task, };
-
 void (*pm_power_off)(void) = NULL;
 EXPORT_SYMBOL(pm_power_off);