s390: Replace S390_lowcore by get_lowcore()

Replace all S390_lowcore usages in arch/s390/ by get_lowcore().

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>

16 files changed, 149 insertions, 150 deletions

diff --git a/arch/s390/kernel/dumpstack.c b/arch/s390/kernel/dumpstack.c
index d2012635b093..1ecd0580561f 100644
--- a/arch/s390/kernel/dumpstack.c
+++ b/arch/s390/kernel/dumpstack.c
@@ -61,28 +61,28 @@ static bool in_task_stack(unsigned long sp, struct task_struct *task,
 
 static bool in_irq_stack(unsigned long sp, struct stack_info *info)
 {
-	unsigned long stack = S390_lowcore.async_stack - STACK_INIT_OFFSET;
+	unsigned long stack = get_lowcore()->async_stack - STACK_INIT_OFFSET;
 
 	return in_stack(sp, info, STACK_TYPE_IRQ, stack);
 }
 
 static bool in_nodat_stack(unsigned long sp, struct stack_info *info)
 {
-	unsigned long stack = S390_lowcore.nodat_stack - STACK_INIT_OFFSET;
+	unsigned long stack = get_lowcore()->nodat_stack - STACK_INIT_OFFSET;
 
 	return in_stack(sp, info, STACK_TYPE_NODAT, stack);
 }
 
 static bool in_mcck_stack(unsigned long sp, struct stack_info *info)
 {
-	unsigned long stack = S390_lowcore.mcck_stack - STACK_INIT_OFFSET;
+	unsigned long stack = get_lowcore()->mcck_stack - STACK_INIT_OFFSET;
 
 	return in_stack(sp, info, STACK_TYPE_MCCK, stack);
 }
 
 static bool in_restart_stack(unsigned long sp, struct stack_info *info)
 {
-	unsigned long stack = S390_lowcore.restart_stack - STACK_INIT_OFFSET;
+	unsigned long stack = get_lowcore()->restart_stack - STACK_INIT_OFFSET;
 
 	return in_stack(sp, info, STACK_TYPE_RESTART, stack);
 }
diff --git a/arch/s390/kernel/early.c b/arch/s390/kernel/early.c
index c666271433fb..467ed4dba817 100644
--- a/arch/s390/kernel/early.c
+++ b/arch/s390/kernel/early.c
@@ -72,7 +72,7 @@ static void __init reset_tod_clock(void)
 
 	memset(&tod_clock_base, 0, sizeof(tod_clock_base));
 	tod_clock_base.tod = TOD_UNIX_EPOCH;
-	S390_lowcore.last_update_clock = TOD_UNIX_EPOCH;
+	get_lowcore()->last_update_clock = TOD_UNIX_EPOCH;
 }
 
 /*
@@ -99,7 +99,7 @@ static noinline __init void detect_machine_type(void)
 
 	/* Check current-configuration-level */
 	if (stsi(NULL, 0, 0, 0) <= 2) {
-		S390_lowcore.machine_flags |= MACHINE_FLAG_LPAR;
+		get_lowcore()->machine_flags |= MACHINE_FLAG_LPAR;
 		return;
 	}
 	/* Get virtual-machine cpu information. */
@@ -108,9 +108,9 @@ static noinline __init void detect_machine_type(void)
 
 	/* Detect known hypervisors */
 	if (!memcmp(vmms->vm[0].cpi, "\xd2\xe5\xd4", 3))
-		S390_lowcore.machine_flags |= MACHINE_FLAG_KVM;
+		get_lowcore()->machine_flags |= MACHINE_FLAG_KVM;
 	else if (!memcmp(vmms->vm[0].cpi, "\xa9\x61\xe5\xd4", 4))
-		S390_lowcore.machine_flags |= MACHINE_FLAG_VM;
+		get_lowcore()->machine_flags |= MACHINE_FLAG_VM;
 }
 
 /* Remove leading, trailing and double whitespace. */
@@ -166,7 +166,7 @@ static __init void setup_topology(void)
 
 	if (!test_facility(11))
 		return;
-	S390_lowcore.machine_flags |= MACHINE_FLAG_TOPOLOGY;
+	get_lowcore()->machine_flags |= MACHINE_FLAG_TOPOLOGY;
 	for (max_mnest = 6; max_mnest > 1; max_mnest--) {
 		if (stsi(&sysinfo_page, 15, 1, max_mnest) == 0)
 			break;
@@ -186,8 +186,8 @@ static noinline __init void setup_lowcore_early(void)
 
 	psw.addr = (unsigned long)early_pgm_check_handler;
 	psw.mask = PSW_KERNEL_BITS;
-	S390_lowcore.program_new_psw = psw;
-	S390_lowcore.preempt_count = INIT_PREEMPT_COUNT;
+	get_lowcore()->program_new_psw = psw;
+	get_lowcore()->preempt_count = INIT_PREEMPT_COUNT;
 }
 
 static noinline __init void setup_facility_list(void)
@@ -211,43 +211,43 @@ static __init void detect_diag9c(void)
 		EX_TABLE(0b,1b)
 		: "=d" (rc) : "0" (-EOPNOTSUPP), "d" (cpu_address) : "cc");
 	if (!rc)
-		S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG9C;
+		get_lowcore()->machine_flags |= MACHINE_FLAG_DIAG9C;
 }
 
 static __init void detect_machine_facilities(void)
 {
 	if (test_facility(8)) {
-		S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT1;
+		get_lowcore()->machine_flags |= MACHINE_FLAG_EDAT1;
 		system_ctl_set_bit(0, CR0_EDAT_BIT);
 	}
 	if (test_facility(78))
-		S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT2;
+		get_lowcore()->machine_flags |= MACHINE_FLAG_EDAT2;
 	if (test_facility(3))
-		S390_lowcore.machine_flags |= MACHINE_FLAG_IDTE;
+		get_lowcore()->machine_flags |= MACHINE_FLAG_IDTE;
 	if (test_facility(50) && test_facility(73)) {
-		S390_lowcore.machine_flags |= MACHINE_FLAG_TE;
+		get_lowcore()->machine_flags |= MACHINE_FLAG_TE;
 		system_ctl_set_bit(0, CR0_TRANSACTIONAL_EXECUTION_BIT);
 	}
 	if (test_facility(51))
-		S390_lowcore.machine_flags |= MACHINE_FLAG_TLB_LC;
+		get_lowcore()->machine_flags |= MACHINE_FLAG_TLB_LC;
 	if (test_facility(129))
 		system_ctl_set_bit(0, CR0_VECTOR_BIT);
 	if (test_facility(130))
-		S390_lowcore.machine_flags |= MACHINE_FLAG_NX;
+		get_lowcore()->machine_flags |= MACHINE_FLAG_NX;
 	if (test_facility(133))
-		S390_lowcore.machine_flags |= MACHINE_FLAG_GS;
+		get_lowcore()->machine_flags |= MACHINE_FLAG_GS;
 	if (test_facility(139) && (tod_clock_base.tod >> 63)) {
 		/* Enabled signed clock comparator comparisons */
-		S390_lowcore.machine_flags |= MACHINE_FLAG_SCC;
+		get_lowcore()->machine_flags |= MACHINE_FLAG_SCC;
 		clock_comparator_max = -1ULL >> 1;
 		system_ctl_set_bit(0, CR0_CLOCK_COMPARATOR_SIGN_BIT);
 	}
 	if (IS_ENABLED(CONFIG_PCI) && test_facility(153)) {
-		S390_lowcore.machine_flags |= MACHINE_FLAG_PCI_MIO;
+		get_lowcore()->machine_flags |= MACHINE_FLAG_PCI_MIO;
 		/* the control bit is set during PCI initialization */
 	}
 	if (test_facility(194))
-		S390_lowcore.machine_flags |= MACHINE_FLAG_RDP;
+		get_lowcore()->machine_flags |= MACHINE_FLAG_RDP;
 }
 
 static inline void save_vector_registers(void)
diff --git a/arch/s390/kernel/idle.c b/arch/s390/kernel/idle.c
index af9c97c0ad73..2c34e02ae64b 100644
--- a/arch/s390/kernel/idle.c
+++ b/arch/s390/kernel/idle.c
@@ -34,13 +34,13 @@ void account_idle_time_irq(void)
 			this_cpu_add(mt_cycles[i], cycles_new[i] - idle->mt_cycles_enter[i]);
 	}
 
-	idle_time = S390_lowcore.int_clock - idle->clock_idle_enter;
+	idle_time = get_lowcore()->int_clock - idle->clock_idle_enter;
 
-	S390_lowcore.steal_timer += idle->clock_idle_enter - S390_lowcore.last_update_clock;
-	S390_lowcore.last_update_clock = S390_lowcore.int_clock;
+	get_lowcore()->steal_timer += idle->clock_idle_enter - get_lowcore()->last_update_clock;
+	get_lowcore()->last_update_clock = get_lowcore()->int_clock;
 
-	S390_lowcore.system_timer += S390_lowcore.last_update_timer - idle->timer_idle_enter;
-	S390_lowcore.last_update_timer = S390_lowcore.sys_enter_timer;
+	get_lowcore()->system_timer += get_lowcore()->last_update_timer - idle->timer_idle_enter;
+	get_lowcore()->last_update_timer = get_lowcore()->sys_enter_timer;
 
 	/* Account time spent with enabled wait psw loaded as idle time. */
 	WRITE_ONCE(idle->idle_time, READ_ONCE(idle->idle_time) + idle_time);
diff --git a/arch/s390/kernel/irq.c b/arch/s390/kernel/irq.c
index 9acc6630abd3..1af5a08d72ab 100644
--- a/arch/s390/kernel/irq.c
+++ b/arch/s390/kernel/irq.c
@@ -100,8 +100,8 @@ static const struct irq_class irqclass_sub_desc[] = {
 
 static void do_IRQ(struct pt_regs *regs, int irq)
 {
-	if (tod_after_eq(S390_lowcore.int_clock,
-			 S390_lowcore.clock_comparator))
+	if (tod_after_eq(get_lowcore()->int_clock,
+			 get_lowcore()->clock_comparator))
 		/* Serve timer interrupts first. */
 		clock_comparator_work();
 	generic_handle_irq(irq);
@@ -111,7 +111,7 @@ static int on_async_stack(void)
 {
 	unsigned long frame = current_frame_address();
 
-	return ((S390_lowcore.async_stack ^ frame) & ~(THREAD_SIZE - 1)) == 0;
+	return ((get_lowcore()->async_stack ^ frame) & ~(THREAD_SIZE - 1)) == 0;
 }
 
 static void do_irq_async(struct pt_regs *regs, int irq)
@@ -119,7 +119,7 @@ static void do_irq_async(struct pt_regs *regs, int irq)
 	if (on_async_stack()) {
 		do_IRQ(regs, irq);
 	} else {
-		call_on_stack(2, S390_lowcore.async_stack, void, do_IRQ,
+		call_on_stack(2, get_lowcore()->async_stack, void, do_IRQ,
 			      struct pt_regs *, regs, int, irq);
 	}
 }
@@ -153,8 +153,8 @@ void noinstr do_io_irq(struct pt_regs *regs)
 
 	set_cpu_flag(CIF_NOHZ_DELAY);
 	do {
-		regs->tpi_info = S390_lowcore.tpi_info;
-		if (S390_lowcore.tpi_info.adapter_IO)
+		regs->tpi_info = get_lowcore()->tpi_info;
+		if (get_lowcore()->tpi_info.adapter_IO)
 			do_irq_async(regs, THIN_INTERRUPT);
 		else
 			do_irq_async(regs, IO_INTERRUPT);
@@ -183,9 +183,9 @@ void noinstr do_ext_irq(struct pt_regs *regs)
 			current->thread.last_break = regs->last_break;
 	}
 
-	regs->int_code = S390_lowcore.ext_int_code_addr;
-	regs->int_parm = S390_lowcore.ext_params;
-	regs->int_parm_long = S390_lowcore.ext_params2;
+	regs->int_code = get_lowcore()->ext_int_code_addr;
+	regs->int_parm = get_lowcore()->ext_params;
+	regs->int_parm_long = get_lowcore()->ext_params2;
 
 	from_idle = test_and_clear_cpu_flag(CIF_ENABLED_WAIT);
 	if (from_idle)
diff --git a/arch/s390/kernel/machine_kexec.c b/arch/s390/kernel/machine_kexec.c
index 3aee98efc374..f4cf65da6d49 100644
--- a/arch/s390/kernel/machine_kexec.c
+++ b/arch/s390/kernel/machine_kexec.c
@@ -52,7 +52,7 @@ static void __do_machine_kdump(void *data)
 	purgatory = (purgatory_t)image->start;
 
 	/* store_status() saved the prefix register to lowcore */
-	prefix = (unsigned long) S390_lowcore.prefixreg_save_area;
+	prefix = (unsigned long)get_lowcore()->prefixreg_save_area;
 
 	/* Now do the reset  */
 	s390_reset_system();
@@ -91,7 +91,7 @@ static noinline void __machine_kdump(void *image)
 			continue;
 	}
 	/* Store status of the boot CPU */
-	mcesa = __va(S390_lowcore.mcesad & MCESA_ORIGIN_MASK);
+	mcesa = __va(get_lowcore()->mcesad & MCESA_ORIGIN_MASK);
 	if (cpu_has_vx())
 		save_vx_regs((__vector128 *) mcesa->vector_save_area);
 	if (MACHINE_HAS_GS) {
diff --git a/arch/s390/kernel/nmi.c b/arch/s390/kernel/nmi.c
index 230d010bac9b..db562416d728 100644
--- a/arch/s390/kernel/nmi.c
+++ b/arch/s390/kernel/nmi.c
@@ -125,7 +125,7 @@ static notrace void s390_handle_damage(void)
 	smp_emergency_stop();
 	diag_amode31_ops.diag308_reset();
 	ptr = nmi_puts(message, "System stopped due to unrecoverable machine check, code: 0x");
-	u64_to_hex(ptr, S390_lowcore.mcck_interruption_code);
+	u64_to_hex(ptr, get_lowcore()->mcck_interruption_code);
 
 	/*
 	 * Disable low address protection and make machine check new PSW a
@@ -135,17 +135,17 @@ static notrace void s390_handle_damage(void)
 	cr0_new = cr0;
 	cr0_new.lap = 0;
 	local_ctl_load(0, &cr0_new.reg);
-	psw_save = S390_lowcore.mcck_new_psw;
-	psw_bits(S390_lowcore.mcck_new_psw).io = 0;
-	psw_bits(S390_lowcore.mcck_new_psw).ext = 0;
-	psw_bits(S390_lowcore.mcck_new_psw).wait = 1;
+	psw_save = get_lowcore()->mcck_new_psw;
+	psw_bits(get_lowcore()->mcck_new_psw).io = 0;
+	psw_bits(get_lowcore()->mcck_new_psw).ext = 0;
+	psw_bits(get_lowcore()->mcck_new_psw).wait = 1;
 	sclp_emergency_printk(message);
 
 	/*
 	 * Restore machine check new PSW and control register 0 to original
 	 * values. This makes possible system dump analysis easier.
 	 */
-	S390_lowcore.mcck_new_psw = psw_save;
+	get_lowcore()->mcck_new_psw = psw_save;
 	local_ctl_load(0, &cr0.reg);
 	disabled_wait();
 	while (1);
@@ -226,7 +226,7 @@ static bool notrace nmi_registers_valid(union mci mci)
 	/*
 	 * Set the clock comparator register to the next expected value.
 	 */
-	set_clock_comparator(S390_lowcore.clock_comparator);
+	set_clock_comparator(get_lowcore()->clock_comparator);
 	if (!mci.gr || !mci.fp || !mci.fc)
 		return false;
 	/*
@@ -252,7 +252,7 @@ static bool notrace nmi_registers_valid(union mci mci)
 	 * check handling must take care of this. The host values are saved by
 	 * KVM and are not affected.
 	 */
-	cr2.reg = S390_lowcore.cregs_save_area[2];
+	cr2.reg = get_lowcore()->cregs_save_area[2];
 	if (cr2.gse && !mci.gs && !test_cpu_flag(CIF_MCCK_GUEST))
 		return false;
 	if (!mci.ms || !mci.pm || !mci.ia)
@@ -278,11 +278,10 @@ static void notrace s390_backup_mcck_info(struct pt_regs *regs)
 
 	sie_page = container_of(sie_block, struct sie_page, sie_block);
 	mcck_backup = &sie_page->mcck_info;
-	mcck_backup->mcic = S390_lowcore.mcck_interruption_code &
+	mcck_backup->mcic = get_lowcore()->mcck_interruption_code &
 				~(MCCK_CODE_CP | MCCK_CODE_EXT_DAMAGE);
-	mcck_backup->ext_damage_code = S390_lowcore.external_damage_code;
-	mcck_backup->failing_storage_address
-			= S390_lowcore.failing_storage_address;
+	mcck_backup->ext_damage_code = get_lowcore()->external_damage_code;
+	mcck_backup->failing_storage_address = get_lowcore()->failing_storage_address;
 }
 NOKPROBE_SYMBOL(s390_backup_mcck_info);
 
@@ -314,7 +313,7 @@ void notrace s390_do_machine_check(struct pt_regs *regs)
 	if (user_mode(regs))
 		update_timer_mcck();
 	inc_irq_stat(NMI_NMI);
-	mci.val = S390_lowcore.mcck_interruption_code;
+	mci.val = get_lowcore()->mcck_interruption_code;
 	mcck = this_cpu_ptr(&cpu_mcck);
 
 	/*
@@ -382,9 +381,9 @@ void notrace s390_do_machine_check(struct pt_regs *regs)
 	}
 	if (mci.ed && mci.ec) {
 		/* External damage */
-		if (S390_lowcore.external_damage_code & (1U << ED_STP_SYNC))
+		if (get_lowcore()->external_damage_code & (1U << ED_STP_SYNC))
 			mcck->stp_queue |= stp_sync_check();
-		if (S390_lowcore.external_damage_code & (1U << ED_STP_ISLAND))
+		if (get_lowcore()->external_damage_code & (1U << ED_STP_ISLAND))
 			mcck->stp_queue |= stp_island_check();
 		mcck_pending = 1;
 	}
diff --git a/arch/s390/kernel/perf_cpum_sf.c b/arch/s390/kernel/perf_cpum_sf.c
index 06efad5b4f93..736c1d9632dd 100644
--- a/arch/s390/kernel/perf_cpum_sf.c
+++ b/arch/s390/kernel/perf_cpum_sf.c
@@ -1022,7 +1022,7 @@ static void cpumsf_pmu_enable(struct pmu *pmu)
 	}
 
 	/* Load current program parameter */
-	lpp(&S390_lowcore.lpp);
+	lpp(&get_lowcore()->lpp);
 
 	debug_sprintf_event(sfdbg, 6, "%s: es %i cs %i ed %i cd %i "
 			    "interval %#lx tear %#lx dear %#lx\n", __func__,
diff --git a/arch/s390/kernel/perf_pai_crypto.c b/arch/s390/kernel/perf_pai_crypto.c
index 95079a289109..2f5a20e300f6 100644
--- a/arch/s390/kernel/perf_pai_crypto.c
+++ b/arch/s390/kernel/perf_pai_crypto.c
@@ -372,7 +372,7 @@ static int paicrypt_add(struct perf_event *event, int flags)
 
 	if (++cpump->active_events == 1) {
 		ccd = virt_to_phys(cpump->page) | PAI_CRYPTO_KERNEL_OFFSET;
-		WRITE_ONCE(S390_lowcore.ccd, ccd);
+		WRITE_ONCE(get_lowcore()->ccd, ccd);
 		local_ctl_set_bit(0, CR0_CRYPTOGRAPHY_COUNTER_BIT);
 	}
 	if (flags & PERF_EF_START)
@@ -409,7 +409,7 @@ static void paicrypt_del(struct perf_event *event, int flags)
 	paicrypt_stop(event, PERF_EF_UPDATE);
 	if (--cpump->active_events == 0) {
 		local_ctl_clear_bit(0, CR0_CRYPTOGRAPHY_COUNTER_BIT);
-		WRITE_ONCE(S390_lowcore.ccd, 0);
+		WRITE_ONCE(get_lowcore()->ccd, 0);
 	}
 }
 
diff --git a/arch/s390/kernel/perf_pai_ext.c b/arch/s390/kernel/perf_pai_ext.c
index 6040f3c2b942..6295531b39a2 100644
--- a/arch/s390/kernel/perf_pai_ext.c
+++ b/arch/s390/kernel/perf_pai_ext.c
@@ -389,7 +389,7 @@ static int paiext_add(struct perf_event *event, int flags)
 	struct paiext_cb *pcb = cpump->paiext_cb;
 
 	if (++cpump->active_events == 1) {
-		S390_lowcore.aicd = virt_to_phys(cpump->paiext_cb);
+		get_lowcore()->aicd = virt_to_phys(cpump->paiext_cb);
 		pcb->acc = virt_to_phys(cpump->area) | 0x1;
 		/* Enable CPU instruction lookup for PAIE1 control block */
 		local_ctl_set_bit(0, CR0_PAI_EXTENSION_BIT);
@@ -431,7 +431,7 @@ static void paiext_del(struct perf_event *event, int flags)
 		/* Disable CPU instruction lookup for PAIE1 control block */
 		local_ctl_clear_bit(0, CR0_PAI_EXTENSION_BIT);
 		pcb->acc = 0;
-		S390_lowcore.aicd = 0;
+		get_lowcore()->aicd = 0;
 	}
 }
 
diff --git a/arch/s390/kernel/process.c b/arch/s390/kernel/process.c
index d8740631df4b..9637aee43c40 100644
--- a/arch/s390/kernel/process.c
+++ b/arch/s390/kernel/process.c
@@ -71,10 +71,10 @@ void flush_thread(void)
 
 void arch_setup_new_exec(void)
 {
-	if (S390_lowcore.current_pid != current->pid) {
-		S390_lowcore.current_pid = current->pid;
+	if (get_lowcore()->current_pid != current->pid) {
+		get_lowcore()->current_pid = current->pid;
 		if (test_facility(40))
-			lpp(&S390_lowcore.lpp);
+			lpp(&get_lowcore()->lpp);
 	}
 }
 
diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c
index 90c2c786bb35..3993f4caf224 100644
--- a/arch/s390/kernel/setup.c
+++ b/arch/s390/kernel/setup.c
@@ -421,16 +421,16 @@ static void __init setup_lowcore(void)
 	lc->clock_comparator = clock_comparator_max;
 	lc->current_task = (unsigned long)&init_task;
 	lc->lpp = LPP_MAGIC;
-	lc->machine_flags = S390_lowcore.machine_flags;
-	lc->preempt_count = S390_lowcore.preempt_count;
+	lc->machine_flags = get_lowcore()->machine_flags;
+	lc->preempt_count = get_lowcore()->preempt_count;
 	nmi_alloc_mcesa_early(&lc->mcesad);
-	lc->sys_enter_timer = S390_lowcore.sys_enter_timer;
-	lc->exit_timer = S390_lowcore.exit_timer;
-	lc->user_timer = S390_lowcore.user_timer;
-	lc->system_timer = S390_lowcore.system_timer;
-	lc->steal_timer = S390_lowcore.steal_timer;
-	lc->last_update_timer = S390_lowcore.last_update_timer;
-	lc->last_update_clock = S390_lowcore.last_update_clock;
+	lc->sys_enter_timer = get_lowcore()->sys_enter_timer;
+	lc->exit_timer = get_lowcore()->exit_timer;
+	lc->user_timer = get_lowcore()->user_timer;
+	lc->system_timer = get_lowcore()->system_timer;
+	lc->steal_timer = get_lowcore()->steal_timer;
+	lc->last_update_timer = get_lowcore()->last_update_timer;
+	lc->last_update_clock = get_lowcore()->last_update_clock;
 	/*
 	 * Allocate the global restart stack which is the same for
 	 * all CPUs in case *one* of them does a PSW restart.
@@ -439,7 +439,7 @@ static void __init setup_lowcore(void)
 	lc->mcck_stack = stack_alloc_early() + STACK_INIT_OFFSET;
 	lc->async_stack = stack_alloc_early() + STACK_INIT_OFFSET;
 	lc->nodat_stack = stack_alloc_early() + STACK_INIT_OFFSET;
-	lc->kernel_stack = S390_lowcore.kernel_stack;
+	lc->kernel_stack = get_lowcore()->kernel_stack;
 	/*
 	 * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant
 	 * restart data to the absolute zero lowcore. This is necessary if
@@ -455,8 +455,8 @@ static void __init setup_lowcore(void)
 	lc->return_lpswe = gen_lpswe(__LC_RETURN_PSW);
 	lc->return_mcck_lpswe = gen_lpswe(__LC_RETURN_MCCK_PSW);
 	lc->preempt_count = PREEMPT_DISABLED;
-	lc->kernel_asce = S390_lowcore.kernel_asce;
-	lc->user_asce = S390_lowcore.user_asce;
+	lc->kernel_asce = get_lowcore()->kernel_asce;
+	lc->user_asce = get_lowcore()->user_asce;
 
 	system_ctlreg_init_save_area(lc);
 	abs_lc = get_abs_lowcore();
diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c
index 0324649aae0a..ebe4bc326a6b 100644
--- a/arch/s390/kernel/smp.c
+++ b/arch/s390/kernel/smp.c
@@ -203,7 +203,7 @@ static int pcpu_alloc_lowcore(struct pcpu *pcpu, int cpu)
 	mcck_stack = stack_alloc();
 	if (!lc || !nodat_stack || !async_stack || !mcck_stack)
 		goto out;
-	memcpy(lc, &S390_lowcore, 512);
+	memcpy(lc, get_lowcore(), 512);
 	memset((char *) lc + 512, 0, sizeof(*lc) - 512);
 	lc->async_stack = async_stack + STACK_INIT_OFFSET;
 	lc->nodat_stack = nodat_stack + STACK_INIT_OFFSET;
@@ -265,9 +265,9 @@ static void pcpu_prepare_secondary(struct pcpu *pcpu, int cpu)
 	lc->spinlock_lockval = arch_spin_lockval(cpu);
 	lc->spinlock_index = 0;
 	lc->percpu_offset = __per_cpu_offset[cpu];
-	lc->kernel_asce = S390_lowcore.kernel_asce;
+	lc->kernel_asce = get_lowcore()->kernel_asce;
 	lc->user_asce = s390_invalid_asce;
-	lc->machine_flags = S390_lowcore.machine_flags;
+	lc->machine_flags = get_lowcore()->machine_flags;
 	lc->user_timer = lc->system_timer =
 		lc->steal_timer = lc->avg_steal_timer = 0;
 	abs_lc = get_abs_lowcore();
@@ -407,7 +407,7 @@ void smp_call_ipl_cpu(void (*func)(void *), void *data)
 	struct lowcore *lc = lowcore_ptr[0];
 
 	if (pcpu_devices[0].address == stap())
-		lc = &S390_lowcore;
+		lc = get_lowcore();
 
 	pcpu_delegate(&pcpu_devices[0], func, data,
 		      lc->nodat_stack);
@@ -844,13 +844,13 @@ static void smp_start_secondary(void *cpuvoid)
 {
 	int cpu = raw_smp_processor_id();
 
-	S390_lowcore.last_update_clock = get_tod_clock();
-	S390_lowcore.restart_stack = (unsigned long)restart_stack;
-	S390_lowcore.restart_fn = (unsigned long)do_restart;
-	S390_lowcore.restart_data = 0;
-	S390_lowcore.restart_source = -1U;
-	S390_lowcore.restart_flags = 0;
-	restore_access_regs(S390_lowcore.access_regs_save_area);
+	get_lowcore()->last_update_clock = get_tod_clock();
+	get_lowcore()->restart_stack = (unsigned long)restart_stack;
+	get_lowcore()->restart_fn = (unsigned long)do_restart;
+	get_lowcore()->restart_data = 0;
+	get_lowcore()->restart_source = -1U;
+	get_lowcore()->restart_flags = 0;
+	restore_access_regs(get_lowcore()->access_regs_save_area);
 	cpu_init();
 	rcutree_report_cpu_starting(cpu);
 	init_cpu_timer();
@@ -981,16 +981,16 @@ void __init smp_prepare_boot_cpu(void)
 
 	WARN_ON(!cpu_present(0) || !cpu_online(0));
 	pcpu->state = CPU_STATE_CONFIGURED;
-	S390_lowcore.percpu_offset = __per_cpu_offset[0];
+	get_lowcore()->percpu_offset = __per_cpu_offset[0];
 	smp_cpu_set_polarization(0, POLARIZATION_UNKNOWN);
 }
 
 void __init smp_setup_processor_id(void)
 {
 	pcpu_devices[0].address = stap();
-	S390_lowcore.cpu_nr = 0;
-	S390_lowcore.spinlock_lockval = arch_spin_lockval(0);
-	S390_lowcore.spinlock_index = 0;
+	get_lowcore()->cpu_nr = 0;
+	get_lowcore()->spinlock_lockval = arch_spin_lockval(0);
+	get_lowcore()->spinlock_index = 0;
 }
 
 /*
diff --git a/arch/s390/kernel/syscall.c b/arch/s390/kernel/syscall.c
index dc2355c623d6..7b9bf0ad364d 100644
--- a/arch/s390/kernel/syscall.c
+++ b/arch/s390/kernel/syscall.c
@@ -151,8 +151,8 @@ void noinstr __do_syscall(struct pt_regs *regs, int per_trap)
 {
 	add_random_kstack_offset();
 	enter_from_user_mode(regs);
-	regs->psw = S390_lowcore.svc_old_psw;
-	regs->int_code = S390_lowcore.svc_int_code;
+	regs->psw = get_lowcore()->svc_old_psw;
+	regs->int_code = get_lowcore()->svc_int_code;
 	update_timer_sys();
 	if (static_branch_likely(&cpu_has_bear))
 		current->thread.last_break = regs->last_break;
diff --git a/arch/s390/kernel/time.c b/arch/s390/kernel/time.c
index fb9f31f36628..b713effe0579 100644
--- a/arch/s390/kernel/time.c
+++ b/arch/s390/kernel/time.c
@@ -131,7 +131,7 @@ void clock_comparator_work(void)
 {
 	struct clock_event_device *cd;
 
-	S390_lowcore.clock_comparator = clock_comparator_max;
+	get_lowcore()->clock_comparator = clock_comparator_max;
 	cd = this_cpu_ptr(&comparators);
 	cd->event_handler(cd);
 }
@@ -139,8 +139,8 @@ void clock_comparator_work(void)
 static int s390_next_event(unsigned long delta,
 			   struct clock_event_device *evt)
 {
-	S390_lowcore.clock_comparator = get_tod_clock() + delta;
-	set_clock_comparator(S390_lowcore.clock_comparator);
+	get_lowcore()->clock_comparator = get_tod_clock() + delta;
+	set_clock_comparator(get_lowcore()->clock_comparator);
 	return 0;
 }
 
@@ -153,8 +153,8 @@ void init_cpu_timer(void)
 	struct clock_event_device *cd;
 	int cpu;
 
-	S390_lowcore.clock_comparator = clock_comparator_max;
-	set_clock_comparator(S390_lowcore.clock_comparator);
+	get_lowcore()->clock_comparator = clock_comparator_max;
+	set_clock_comparator(get_lowcore()->clock_comparator);
 
 	cpu = smp_processor_id();
 	cd = &per_cpu(comparators, cpu);
@@ -184,8 +184,8 @@ static void clock_comparator_interrupt(struct ext_code ext_code,
 				       unsigned long param64)
 {
 	inc_irq_stat(IRQEXT_CLK);
-	if (S390_lowcore.clock_comparator == clock_comparator_max)
-		set_clock_comparator(S390_lowcore.clock_comparator);
+	if (get_lowcore()->clock_comparator == clock_comparator_max)
+		set_clock_comparator(get_lowcore()->clock_comparator);
 }
 
 static void stp_timing_alert(struct stp_irq_parm *);
@@ -408,12 +408,12 @@ static void clock_sync_global(long delta)
 static void clock_sync_local(long delta)
 {
 	/* Add the delta to the clock comparator. */
-	if (S390_lowcore.clock_comparator != clock_comparator_max) {
-		S390_lowcore.clock_comparator += delta;
-		set_clock_comparator(S390_lowcore.clock_comparator);
+	if (get_lowcore()->clock_comparator != clock_comparator_max) {
+		get_lowcore()->clock_comparator += delta;
+		set_clock_comparator(get_lowcore()->clock_comparator);
 	}
 	/* Adjust the last_update_clock time-stamp. */
-	S390_lowcore.last_update_clock += delta;
+	get_lowcore()->last_update_clock += delta;
 }
 
 /* Single threaded workqueue used for stp sync events */
diff --git a/arch/s390/kernel/traps.c b/arch/s390/kernel/traps.c
index 52578b5cecbd..8b904f7efb0e 100644
--- a/arch/s390/kernel/traps.c
+++ b/arch/s390/kernel/traps.c
@@ -293,10 +293,10 @@ void __init trap_init(void)
 
 	local_irq_save(flags);
 	cr0 = local_ctl_clear_bit(0, CR0_LOW_ADDRESS_PROTECTION_BIT);
-	psw_bits(S390_lowcore.external_new_psw).mcheck = 1;
-	psw_bits(S390_lowcore.program_new_psw).mcheck = 1;
-	psw_bits(S390_lowcore.svc_new_psw).mcheck = 1;
-	psw_bits(S390_lowcore.io_new_psw).mcheck = 1;
+	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;
 	local_ctl_load(0, &cr0);
 	local_irq_restore(flags);
 	local_mcck_enable();
@@ -310,8 +310,8 @@ void noinstr __do_pgm_check(struct pt_regs *regs)
 	unsigned int trapnr;
 	irqentry_state_t state;
 
-	regs->int_code = S390_lowcore.pgm_int_code;
-	regs->int_parm_long = S390_lowcore.trans_exc_code;
+	regs->int_code = get_lowcore()->pgm_int_code;
+	regs->int_parm_long = get_lowcore()->trans_exc_code;
 
 	state = irqentry_enter(regs);
 
@@ -324,19 +324,19 @@ void noinstr __do_pgm_check(struct pt_regs *regs)
 		current->thread.last_break = regs->last_break;
 	}
 
-	if (S390_lowcore.pgm_code & 0x0200) {
+	if (get_lowcore()->pgm_code & 0x0200) {
 		/* transaction abort */
-		current->thread.trap_tdb = S390_lowcore.pgm_tdb;
+		current->thread.trap_tdb = get_lowcore()->pgm_tdb;
 	}
 
-	if (S390_lowcore.pgm_code & PGM_INT_CODE_PER) {
+	if (get_lowcore()->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 = S390_lowcore.per_address;
-			ev->cause = S390_lowcore.per_code_combined;
-			ev->paid = S390_lowcore.per_access_id;
+			ev->address = get_lowcore()->per_address;
+			ev->cause = get_lowcore()->per_code_combined;
+			ev->paid = get_lowcore()->per_access_id;
 		} else {
 			/* PER event in kernel is kprobes */
 			__arch_local_irq_ssm(regs->psw.mask & ~PSW_MASK_PER);
diff --git a/arch/s390/kernel/vtime.c b/arch/s390/kernel/vtime.c
index ffc1db0cbf9c..7d8991c3cd3a 100644
--- a/arch/s390/kernel/vtime.c
+++ b/arch/s390/kernel/vtime.c
@@ -41,8 +41,8 @@ static inline void set_vtimer(u64 expires)
 		"	stpt	%0\n"	/* Store current cpu timer value */
 		"	spt	%1"	/* Set new value imm. afterwards */
 		: "=Q" (timer) : "Q" (expires));
-	S390_lowcore.system_timer += S390_lowcore.last_update_timer - timer;
-	S390_lowcore.last_update_timer = expires;
+	get_lowcore()->system_timer += get_lowcore()->last_update_timer - timer;
+	get_lowcore()->last_update_timer = expires;
 }
 
 static inline int virt_timer_forward(u64 elapsed)
@@ -118,21 +118,21 @@ static int do_account_vtime(struct task_struct *tsk)
 {
 	u64 timer, clock, user, guest, system, hardirq, softirq;
 
-	timer = S390_lowcore.last_update_timer;
-	clock = S390_lowcore.last_update_clock;
+	timer = get_lowcore()->last_update_timer;
+	clock = get_lowcore()->last_update_clock;
 	asm volatile(
 		"	stpt	%0\n"	/* Store current cpu timer value */
 		"	stckf	%1"	/* Store current tod clock value */
-		: "=Q" (S390_lowcore.last_update_timer),
-		  "=Q" (S390_lowcore.last_update_clock)
+		: "=Q" (get_lowcore()->last_update_timer),
+		  "=Q" (get_lowcore()->last_update_clock)
 		: : "cc");
-	clock = S390_lowcore.last_update_clock - clock;
-	timer -= S390_lowcore.last_update_timer;
+	clock = get_lowcore()->last_update_clock - clock;
+	timer -= get_lowcore()->last_update_timer;
 
 	if (hardirq_count())
-		S390_lowcore.hardirq_timer += timer;
+		get_lowcore()->hardirq_timer += timer;
 	else
-		S390_lowcore.system_timer += timer;
+		get_lowcore()->system_timer += timer;
 
 	/* Update MT utilization calculation */
 	if (smp_cpu_mtid &&
@@ -141,16 +141,16 @@ static int do_account_vtime(struct task_struct *tsk)
 
 	/* Calculate cputime delta */
 	user = update_tsk_timer(&tsk->thread.user_timer,
-				READ_ONCE(S390_lowcore.user_timer));
+				READ_ONCE(get_lowcore()->user_timer));
 	guest = update_tsk_timer(&tsk->thread.guest_timer,
-				 READ_ONCE(S390_lowcore.guest_timer));
+				 READ_ONCE(get_lowcore()->guest_timer));
 	system = update_tsk_timer(&tsk->thread.system_timer,
-				  READ_ONCE(S390_lowcore.system_timer));
+				  READ_ONCE(get_lowcore()->system_timer));
 	hardirq = update_tsk_timer(&tsk->thread.hardirq_timer,
-				   READ_ONCE(S390_lowcore.hardirq_timer));
+				   READ_ONCE(get_lowcore()->hardirq_timer));
 	softirq = update_tsk_timer(&tsk->thread.softirq_timer,
-				   READ_ONCE(S390_lowcore.softirq_timer));
-	S390_lowcore.steal_timer +=
+				   READ_ONCE(get_lowcore()->softirq_timer));
+	get_lowcore()->steal_timer +=
 		clock - user - guest - system - hardirq - softirq;
 
 	/* Push account value */
@@ -177,16 +177,16 @@ static int do_account_vtime(struct task_struct *tsk)
 void vtime_task_switch(struct task_struct *prev)
 {
 	do_account_vtime(prev);
-	prev->thread.user_timer = S390_lowcore.user_timer;
-	prev->thread.guest_timer = S390_lowcore.guest_timer;
-	prev->thread.system_timer = S390_lowcore.system_timer;
-	prev->thread.hardirq_timer = S390_lowcore.hardirq_timer;
-	prev->thread.softirq_timer = S390_lowcore.softirq_timer;
-	S390_lowcore.user_timer = current->thread.user_timer;
-	S390_lowcore.guest_timer = current->thread.guest_timer;
-	S390_lowcore.system_timer = current->thread.system_timer;
-	S390_lowcore.hardirq_timer = current->thread.hardirq_timer;
-	S390_lowcore.softirq_timer = current->thread.softirq_timer;
+	prev->thread.user_timer = get_lowcore()->user_timer;
+	prev->thread.guest_timer = get_lowcore()->guest_timer;
+	prev->thread.system_timer = get_lowcore()->system_timer;
+	prev->thread.hardirq_timer = get_lowcore()->hardirq_timer;
+	prev->thread.softirq_timer = get_lowcore()->softirq_timer;
+	get_lowcore()->user_timer = current->thread.user_timer;
+	get_lowcore()->guest_timer = current->thread.guest_timer;
+	get_lowcore()->system_timer = current->thread.system_timer;
+	get_lowcore()->hardirq_timer = current->thread.hardirq_timer;
+	get_lowcore()->softirq_timer = current->thread.softirq_timer;
 }
 
 /*
@@ -201,23 +201,23 @@ void vtime_flush(struct task_struct *tsk)
 	if (do_account_vtime(tsk))
 		virt_timer_expire();
 
-	steal = S390_lowcore.steal_timer;
-	avg_steal = S390_lowcore.avg_steal_timer;
+	steal = get_lowcore()->steal_timer;
+	avg_steal = get_lowcore()->avg_steal_timer;
 	if ((s64) steal > 0) {
-		S390_lowcore.steal_timer = 0;
+		get_lowcore()->steal_timer = 0;
 		account_steal_time(cputime_to_nsecs(steal));
 		avg_steal += steal;
 	}
-	S390_lowcore.avg_steal_timer = avg_steal / 2;
+	get_lowcore()->avg_steal_timer = avg_steal / 2;
 }
 
 static u64 vtime_delta(void)
 {
-	u64 timer = S390_lowcore.last_update_timer;
+	u64 timer = get_lowcore()->last_update_timer;
 
-	S390_lowcore.last_update_timer = get_cpu_timer();
+	get_lowcore()->last_update_timer = get_cpu_timer();
 
-	return timer - S390_lowcore.last_update_timer;
+	return timer - get_lowcore()->last_update_timer;
 }
 
 /*
@@ -229,9 +229,9 @@ void vtime_account_kernel(struct task_struct *tsk)
 	u64 delta = vtime_delta();
 
 	if (tsk->flags & PF_VCPU)
-		S390_lowcore.guest_timer += delta;
+		get_lowcore()->guest_timer += delta;
 	else
-		S390_lowcore.system_timer += delta;
+		get_lowcore()->system_timer += delta;
 
 	virt_timer_forward(delta);
 }
@@ -241,7 +241,7 @@ void vtime_account_softirq(struct task_struct *tsk)
 {
 	u64 delta = vtime_delta();
 
-	S390_lowcore.softirq_timer += delta;
+	get_lowcore()->softirq_timer += delta;
 
 	virt_timer_forward(delta);
 }
@@ -250,7 +250,7 @@ void vtime_account_hardirq(struct task_struct *tsk)
 {
 	u64 delta = vtime_delta();
 
-	S390_lowcore.hardirq_timer += delta;
+	get_lowcore()->hardirq_timer += delta;
 
 	virt_timer_forward(delta);
 }