aboutsummaryrefslogtreecommitdiff
path: root/arch/s390/kernel
diff options
context:
space:
mode:
Diffstat (limited to 'arch/s390/kernel')
-rw-r--r--arch/s390/kernel/kprobes.c18
-rw-r--r--arch/s390/kernel/smp.c28
-rw-r--r--arch/s390/kernel/time.c16
-rw-r--r--arch/s390/kernel/vtime.c27
4 files changed, 46 insertions, 43 deletions
diff --git a/arch/s390/kernel/kprobes.c b/arch/s390/kernel/kprobes.c
index 9bb2f6241d9..86783efa24e 100644
--- a/arch/s390/kernel/kprobes.c
+++ b/arch/s390/kernel/kprobes.c
@@ -154,39 +154,35 @@ void __kprobes get_instruction_type(struct arch_specific_insn *ainsn)
static int __kprobes swap_instruction(void *aref)
{
+ struct kprobe_ctlblk *kcb = get_kprobe_ctlblk();
+ unsigned long status = kcb->kprobe_status;
struct ins_replace_args *args = aref;
+ int rc;
- return probe_kernel_write(args->ptr, &args->new, sizeof(args->new));
+ kcb->kprobe_status = KPROBE_SWAP_INST;
+ rc = probe_kernel_write(args->ptr, &args->new, sizeof(args->new));
+ kcb->kprobe_status = status;
+ return rc;
}
void __kprobes arch_arm_kprobe(struct kprobe *p)
{
- struct kprobe_ctlblk *kcb = get_kprobe_ctlblk();
- unsigned long status = kcb->kprobe_status;
struct ins_replace_args args;
args.ptr = p->addr;
args.old = p->opcode;
args.new = BREAKPOINT_INSTRUCTION;
-
- kcb->kprobe_status = KPROBE_SWAP_INST;
stop_machine(swap_instruction, &args, NULL);
- kcb->kprobe_status = status;
}
void __kprobes arch_disarm_kprobe(struct kprobe *p)
{
- struct kprobe_ctlblk *kcb = get_kprobe_ctlblk();
- unsigned long status = kcb->kprobe_status;
struct ins_replace_args args;
args.ptr = p->addr;
args.old = BREAKPOINT_INSTRUCTION;
args.new = p->opcode;
-
- kcb->kprobe_status = KPROBE_SWAP_INST;
stop_machine(swap_instruction, &args, NULL);
- kcb->kprobe_status = status;
}
void __kprobes arch_remove_kprobe(struct kprobe *p)
diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c
index fd8e3111a4e..2270730f535 100644
--- a/arch/s390/kernel/smp.c
+++ b/arch/s390/kernel/smp.c
@@ -856,13 +856,20 @@ static ssize_t show_idle_count(struct sys_device *dev,
{
struct s390_idle_data *idle;
unsigned long long idle_count;
+ unsigned int sequence;
idle = &per_cpu(s390_idle, dev->id);
- spin_lock(&idle->lock);
+repeat:
+ sequence = idle->sequence;
+ smp_rmb();
+ if (sequence & 1)
+ goto repeat;
idle_count = idle->idle_count;
if (idle->idle_enter)
idle_count++;
- spin_unlock(&idle->lock);
+ smp_rmb();
+ if (idle->sequence != sequence)
+ goto repeat;
return sprintf(buf, "%llu\n", idle_count);
}
static SYSDEV_ATTR(idle_count, 0444, show_idle_count, NULL);
@@ -872,15 +879,22 @@ static ssize_t show_idle_time(struct sys_device *dev,
{
struct s390_idle_data *idle;
unsigned long long now, idle_time, idle_enter;
+ unsigned int sequence;
idle = &per_cpu(s390_idle, dev->id);
- spin_lock(&idle->lock);
now = get_clock();
+repeat:
+ sequence = idle->sequence;
+ smp_rmb();
+ if (sequence & 1)
+ goto repeat;
idle_time = idle->idle_time;
idle_enter = idle->idle_enter;
if (idle_enter != 0ULL && idle_enter < now)
idle_time += now - idle_enter;
- spin_unlock(&idle->lock);
+ smp_rmb();
+ if (idle->sequence != sequence)
+ goto repeat;
return sprintf(buf, "%llu\n", idle_time >> 12);
}
static SYSDEV_ATTR(idle_time_us, 0444, show_idle_time, NULL);
@@ -908,11 +922,7 @@ static int __cpuinit smp_cpu_notify(struct notifier_block *self,
case CPU_ONLINE:
case CPU_ONLINE_FROZEN:
idle = &per_cpu(s390_idle, cpu);
- spin_lock_irq(&idle->lock);
- idle->idle_enter = 0;
- idle->idle_time = 0;
- idle->idle_count = 0;
- spin_unlock_irq(&idle->lock);
+ memset(idle, 0, sizeof(struct s390_idle_data));
if (sysfs_create_group(&s->kobj, &cpu_online_attr_group))
return NOTIFY_BAD;
break;
diff --git a/arch/s390/kernel/time.c b/arch/s390/kernel/time.c
index 215330a2c12..d4c8e9c47c8 100644
--- a/arch/s390/kernel/time.c
+++ b/arch/s390/kernel/time.c
@@ -36,7 +36,6 @@
#include <linux/notifier.h>
#include <linux/clocksource.h>
#include <linux/clockchips.h>
-#include <linux/bootmem.h>
#include <asm/uaccess.h>
#include <asm/delay.h>
#include <asm/s390_ext.h>
@@ -62,9 +61,6 @@
u64 sched_clock_base_cc = -1; /* Force to data section. */
-static ext_int_info_t ext_int_info_cc;
-static ext_int_info_t ext_int_etr_cc;
-
static DEFINE_PER_CPU(struct clock_event_device, comparators);
/*
@@ -255,15 +251,11 @@ void __init time_init(void)
stp_reset();
/* request the clock comparator external interrupt */
- if (register_early_external_interrupt(0x1004,
- clock_comparator_interrupt,
- &ext_int_info_cc) != 0)
+ if (register_external_interrupt(0x1004, clock_comparator_interrupt))
panic("Couldn't request external interrupt 0x1004");
/* request the timing alert external interrupt */
- if (register_early_external_interrupt(0x1406,
- timing_alert_interrupt,
- &ext_int_etr_cc) != 0)
+ if (register_external_interrupt(0x1406, timing_alert_interrupt))
panic("Couldn't request external interrupt 0x1406");
if (clocksource_register(&clocksource_tod) != 0)
@@ -1445,14 +1437,14 @@ static void __init stp_reset(void)
{
int rc;
- stp_page = alloc_bootmem_pages(PAGE_SIZE);
+ stp_page = (void *) get_zeroed_page(GFP_ATOMIC);
rc = chsc_sstpc(stp_page, STP_OP_CTRL, 0x0000);
if (rc == 0)
set_bit(CLOCK_SYNC_HAS_STP, &clock_sync_flags);
else if (stp_online) {
pr_warning("The real or virtual hardware system does "
"not provide an STP interface\n");
- free_bootmem((unsigned long) stp_page, PAGE_SIZE);
+ free_page((unsigned long) stp_page);
stp_page = NULL;
stp_online = 0;
}
diff --git a/arch/s390/kernel/vtime.c b/arch/s390/kernel/vtime.c
index c8eb7255332..c41bb0d416e 100644
--- a/arch/s390/kernel/vtime.c
+++ b/arch/s390/kernel/vtime.c
@@ -25,13 +25,9 @@
#include <asm/irq_regs.h>
#include <asm/cputime.h>
-static ext_int_info_t ext_int_info_timer;
-
static DEFINE_PER_CPU(struct vtimer_queue, virt_cpu_timer);
-DEFINE_PER_CPU(struct s390_idle_data, s390_idle) = {
- .lock = __SPIN_LOCK_UNLOCKED(s390_idle.lock)
-};
+DEFINE_PER_CPU(struct s390_idle_data, s390_idle);
static inline __u64 get_vtimer(void)
{
@@ -153,11 +149,13 @@ void vtime_start_cpu(void)
vq->elapsed -= vq->idle - S390_lowcore.async_enter_timer;
}
- spin_lock(&idle->lock);
+ idle->sequence++;
+ smp_wmb();
idle->idle_time += idle_time;
idle->idle_enter = 0ULL;
idle->idle_count++;
- spin_unlock(&idle->lock);
+ smp_wmb();
+ idle->sequence++;
}
void vtime_stop_cpu(void)
@@ -244,15 +242,23 @@ cputime64_t s390_get_idle_time(int cpu)
{
struct s390_idle_data *idle;
unsigned long long now, idle_time, idle_enter;
+ unsigned int sequence;
idle = &per_cpu(s390_idle, cpu);
- spin_lock(&idle->lock);
+
now = get_clock();
+repeat:
+ sequence = idle->sequence;
+ smp_rmb();
+ if (sequence & 1)
+ goto repeat;
idle_time = 0;
idle_enter = idle->idle_enter;
if (idle_enter != 0ULL && idle_enter < now)
idle_time = now - idle_enter;
- spin_unlock(&idle->lock);
+ smp_rmb();
+ if (idle->sequence != sequence)
+ goto repeat;
return idle_time;
}
@@ -557,8 +563,7 @@ void init_cpu_vtimer(void)
void __init vtime_init(void)
{
/* request the cpu timer external interrupt */
- if (register_early_external_interrupt(0x1005, do_cpu_timer_interrupt,
- &ext_int_info_timer) != 0)
+ if (register_external_interrupt(0x1005, do_cpu_timer_interrupt))
panic("Couldn't request external interrupt 0x1005");
/* Enable cpu timer interrupts on the boot cpu. */
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-10 01:54:52 +0000