s390/mm: Remove duplicate get_lowcore() calls

Assign the output from get_lowcore() to a local variable,
so the code is easier to read.
Acked-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>

arch/s390/kernel/traps.c

@@ -288,15 +288,16 @@ static void __init test_monitor_call(void)
 
 void __init trap_init(void)
 {
+	struct lowcore *lc = get_lowcore();
 	unsigned long flags;
 	struct ctlreg cr0;
 
 	local_irq_save(flags);
 	cr0 = local_ctl_clear_bit(0, CR0_LOW_ADDRESS_PROTECTION_BIT);
-	psw_bits(get_lowcore()->external_new_psw).mcheck = 1;
-	psw_bits(get_lowcore()->program_new_psw).mcheck = 1;
-	psw_bits(get_lowcore()->svc_new_psw).mcheck = 1;
-	psw_bits(get_lowcore()->io_new_psw).mcheck = 1;
+	psw_bits(lc->external_new_psw).mcheck = 1;
+	psw_bits(lc->program_new_psw).mcheck = 1;
+	psw_bits(lc->svc_new_psw).mcheck = 1;
+	psw_bits(lc->io_new_psw).mcheck = 1;
 	local_ctl_load(0, &cr0);
 	local_irq_restore(flags);
 	local_mcck_enable();
@@ -307,11 +308,12 @@ static void (*pgm_check_table[128])(struct pt_regs *regs);
 
 void noinstr __do_pgm_check(struct pt_regs *regs)
 {
-	unsigned int trapnr;
+	struct lowcore *lc = get_lowcore();
 	irqentry_state_t state;
+	unsigned int trapnr;
 
-	regs->int_code = get_lowcore()->pgm_int_code;
-	regs->int_parm_long = get_lowcore()->trans_exc_code;
+	regs->int_code = lc->pgm_int_code;
+	regs->int_parm_long = lc->trans_exc_code;
 
 	state = irqentry_enter(regs);
 
@@ -324,19 +326,19 @@ void noinstr __do_pgm_check(struct pt_regs *regs)
 		current->thread.last_break = regs->last_break;
 	}
 
-	if (get_lowcore()->pgm_code & 0x0200) {
+	if (lc->pgm_code & 0x0200) {
 		/* transaction abort */
-		current->thread.trap_tdb = get_lowcore()->pgm_tdb;
+		current->thread.trap_tdb = lc->pgm_tdb;
 	}
 
-	if (get_lowcore()->pgm_code & PGM_INT_CODE_PER) {
+	if (lc->pgm_code & PGM_INT_CODE_PER) {
 		if (user_mode(regs)) {
 			struct per_event *ev = &current->thread.per_event;
 
 			set_thread_flag(TIF_PER_TRAP);
-			ev->address = get_lowcore()->per_address;
-			ev->cause = get_lowcore()->per_code_combined;
-			ev->paid = get_lowcore()->per_access_id;
+			ev->address = lc->per_address;
+			ev->cause = lc->per_code_combined;
+			ev->paid = lc->per_access_id;
 		} else {
 			/* PER event in kernel is kprobes */
 			__arch_local_irq_ssm(regs->psw.mask & ~PSW_MASK_PER);