s390/base: remove unused s390_base_mcck_handler

s390_base_mcck_handler was used during system reset if diag308 set was
not available. But after commit d485235b ("s390: assume diag308 set
always works") is a dead code and could be removed.
Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>

arch/s390/include/asm/processor.h

@@ -324,11 +324,9 @@ static inline void __noreturn disabled_wait(void)
  * Basic Machine Check/Program Check Handler.
  */
 
-extern void s390_base_mcck_handler(void);
 extern void s390_base_pgm_handler(void);
 extern void s390_base_ext_handler(void);
 
-extern void (*s390_base_mcck_handler_fn)(void);
 extern void (*s390_base_pgm_handler_fn)(void);
 extern void (*s390_base_ext_handler_fn)(void);
 

arch/s390/kernel/base.S

@@ -16,27 +16,6 @@
 	GEN_BR_THUNK %r9
 	GEN_BR_THUNK %r14
 
-ENTRY(s390_base_mcck_handler)
-	basr	%r13,0
-0:	lg	%r15,__LC_NODAT_STACK	# load panic stack
-	aghi	%r15,-STACK_FRAME_OVERHEAD
-	larl	%r1,s390_base_mcck_handler_fn
-	lg	%r9,0(%r1)
-	ltgr	%r9,%r9
-	jz	1f
-	BASR_EX	%r14,%r9
-1:	la	%r1,4095
-	lmg	%r0,%r15,__LC_GPREGS_SAVE_AREA-4095(%r1)
-	lpswe	__LC_MCK_OLD_PSW
-ENDPROC(s390_base_mcck_handler)
-
-	.section .bss
-	.align 8
-	.globl	s390_base_mcck_handler_fn
-s390_base_mcck_handler_fn:
-	.quad	0
-	.previous
-
 ENTRY(s390_base_ext_handler)
 	stmg	%r0,%r15,__LC_SAVE_AREA_ASYNC
 	basr	%r13,0