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Message-ID: <473CC4C7.8080306@ct.jp.nec.com>
Date: Thu, 15 Nov 2007 14:14:31 -0800
From: Hiroshi Shimamoto <h-shimamoto@...jp.nec.com>
To: tglx@...utronix.de, mingo@...hat.com, hpa@...or.com
Cc: linux-kernel@...r.kernel.org
Subject: [PATCH] x86: clean up nmi_32/64.c
Subject: [PATCH] x86: clean up nmi_32/64.c
clean up and make nmi_32/64.c more similar.
- white space and coding style clean up.
- nmi_cpu_busy is available on CONFIG_SMP.
- move functions __acpi_nmi_enable, acpi_nmi_enable,
__acpi_nmi_disable and acpi_nmi_disable.
- make variables name more similar.
Signed-off-by: Hiroshi Shimamoto <h-shimamoto@...jp.nec.com>
---
arch/x86/kernel/nmi_32.c | 18 +++++----
arch/x86/kernel/nmi_64.c | 92 +++++++++++++++++++++++-----------------------
2 files changed, 56 insertions(+), 54 deletions(-)
diff --git a/arch/x86/kernel/nmi_32.c b/arch/x86/kernel/nmi_32.c
index 600fd40..d0da785 100644
--- a/arch/x86/kernel/nmi_32.c
+++ b/arch/x86/kernel/nmi_32.c
@@ -51,13 +51,13 @@ static int unknown_nmi_panic_callback(struct pt_regs *regs, int cpu);
static int endflag __initdata = 0;
+#ifdef CONFIG_SMP
/* The performance counters used by NMI_LOCAL_APIC don't trigger when
* the CPU is idle. To make sure the NMI watchdog really ticks on all
* CPUs during the test make them busy.
*/
static __init void nmi_cpu_busy(void *data)
{
-#ifdef CONFIG_SMP
local_irq_enable_in_hardirq();
/* Intentionally don't use cpu_relax here. This is
to make sure that the performance counter really ticks,
@@ -67,8 +67,8 @@ static __init void nmi_cpu_busy(void *data)
care if they get somewhat less cycles. */
while (endflag == 0)
mb();
-#endif
}
+#endif
static int __init check_nmi_watchdog(void)
{
@@ -87,11 +87,13 @@ static int __init check_nmi_watchdog(void)
printk(KERN_INFO "Testing NMI watchdog ... ");
+#ifdef CONFIG_SMP
if (nmi_watchdog == NMI_LOCAL_APIC)
smp_call_function(nmi_cpu_busy, (void *)&endflag, 0, 0);
+#endif
for_each_possible_cpu(cpu)
- prev_nmi_count[cpu] = per_cpu(irq_stat, cpu).__nmi_count;
+ prev_nmi_count[cpu] = nmi_count(cpu);
local_irq_enable();
mdelay((20*1000)/nmi_hz); // wait 20 ticks
@@ -113,12 +115,13 @@ static int __init check_nmi_watchdog(void)
atomic_dec(&nmi_active);
}
}
- endflag = 1;
if (!atomic_read(&nmi_active)) {
kfree(prev_nmi_count);
atomic_set(&nmi_active, -1);
+ endflag = 1;
return -1;
}
+ endflag = 1;
printk("OK.\n");
/* now that we know it works we can reduce NMI frequency to
@@ -173,7 +176,6 @@ static int lapic_nmi_resume(struct sys_device *dev)
return 0;
}
-
static struct sysdev_class nmi_sysclass = {
set_kset_name("lapic_nmi"),
.resume = lapic_nmi_resume,
@@ -236,10 +238,10 @@ void acpi_nmi_disable(void)
on_each_cpu(__acpi_nmi_disable, NULL, 0, 1);
}
-void setup_apic_nmi_watchdog (void *unused)
+void setup_apic_nmi_watchdog(void *unused)
{
if (__get_cpu_var(wd_enabled))
- return;
+ return;
/* cheap hack to support suspend/resume */
/* if cpu0 is not active neither should the other cpus */
@@ -328,7 +330,7 @@ __kprobes int nmi_watchdog_tick(struct pt_regs * regs, unsigned reason)
unsigned int sum;
int touched = 0;
int cpu = smp_processor_id();
- int rc=0;
+ int rc = 0;
/* check for other users first */
if (notify_die(DIE_NMI, "nmi", regs, reason, 2, SIGINT)
diff --git a/arch/x86/kernel/nmi_64.c b/arch/x86/kernel/nmi_64.c
index ce08111..b4f88d6 100644
--- a/arch/x86/kernel/nmi_64.c
+++ b/arch/x86/kernel/nmi_64.c
@@ -78,22 +78,22 @@ static __init void nmi_cpu_busy(void *data)
}
#endif
-int __init check_nmi_watchdog (void)
+int __init check_nmi_watchdog(void)
{
- int *counts;
+ int *prev_nmi_count;
int cpu;
- if ((nmi_watchdog == NMI_NONE) || (nmi_watchdog == NMI_DISABLED))
+ if ((nmi_watchdog == NMI_NONE) || (nmi_watchdog == NMI_DISABLED))
return 0;
if (!atomic_read(&nmi_active))
return 0;
- counts = kmalloc(NR_CPUS * sizeof(int), GFP_KERNEL);
- if (!counts)
+ prev_nmi_count = kmalloc(NR_CPUS * sizeof(int), GFP_KERNEL);
+ if (!prev_nmi_count)
return -1;
- printk(KERN_INFO "testing NMI watchdog ... ");
+ printk(KERN_INFO "Testing NMI watchdog ... ");
#ifdef CONFIG_SMP
if (nmi_watchdog == NMI_LOCAL_APIC)
@@ -101,24 +101,24 @@ int __init check_nmi_watchdog (void)
#endif
for (cpu = 0; cpu < NR_CPUS; cpu++)
- counts[cpu] = cpu_pda(cpu)->__nmi_count;
+ prev_nmi_count[cpu] = cpu_pda(cpu)->__nmi_count;
local_irq_enable();
mdelay((20*1000)/nmi_hz); // wait 20 ticks
for_each_online_cpu(cpu) {
if (!per_cpu(wd_enabled, cpu))
continue;
- if (cpu_pda(cpu)->__nmi_count - counts[cpu] <= 5) {
+ if (cpu_pda(cpu)->__nmi_count - prev_nmi_count[cpu] <= 5) {
printk("CPU#%d: NMI appears to be stuck (%d->%d)!\n",
- cpu,
- counts[cpu],
- cpu_pda(cpu)->__nmi_count);
+ cpu,
+ prev_nmi_count[cpu],
+ cpu_pda(cpu)->__nmi_count);
per_cpu(wd_enabled, cpu) = 0;
atomic_dec(&nmi_active);
}
}
if (!atomic_read(&nmi_active)) {
- kfree(counts);
+ kfree(prev_nmi_count);
atomic_set(&nmi_active, -1);
endflag = 1;
return -1;
@@ -131,7 +131,7 @@ int __init check_nmi_watchdog (void)
if (nmi_watchdog == NMI_LOCAL_APIC)
nmi_hz = lapic_adjust_nmi_hz(1);
- kfree(counts);
+ kfree(prev_nmi_count);
return 0;
}
@@ -158,34 +158,6 @@ static int __init setup_nmi_watchdog(char *str)
__setup("nmi_watchdog=", setup_nmi_watchdog);
-
-static void __acpi_nmi_disable(void *__unused)
-{
- apic_write(APIC_LVT0, APIC_DM_NMI | APIC_LVT_MASKED);
-}
-
-/*
- * Disable timer based NMIs on all CPUs:
- */
-void acpi_nmi_disable(void)
-{
- if (atomic_read(&nmi_active) && nmi_watchdog == NMI_IO_APIC)
- on_each_cpu(__acpi_nmi_disable, NULL, 0, 1);
-}
-
-static void __acpi_nmi_enable(void *__unused)
-{
- apic_write(APIC_LVT0, APIC_DM_NMI);
-}
-
-/*
- * Enable timer based NMIs on all CPUs:
- */
-void acpi_nmi_enable(void)
-{
- if (atomic_read(&nmi_active) && nmi_watchdog == NMI_IO_APIC)
- on_each_cpu(__acpi_nmi_enable, NULL, 0, 1);
-}
#ifdef CONFIG_PM
static int nmi_pm_active; /* nmi_active before suspend */
@@ -216,7 +188,7 @@ static struct sysdev_class nmi_sysclass = {
};
static struct sys_device device_lapic_nmi = {
- .id = 0,
+ .id = 0,
.cls = &nmi_sysclass,
};
@@ -230,7 +202,7 @@ static int __init init_lapic_nmi_sysfs(void)
if (nmi_watchdog != NMI_LOCAL_APIC)
return 0;
- if ( atomic_read(&nmi_active) < 0 )
+ if (atomic_read(&nmi_active) < 0)
return 0;
error = sysdev_class_register(&nmi_sysclass);
@@ -243,9 +215,37 @@ late_initcall(init_lapic_nmi_sysfs);
#endif /* CONFIG_PM */
+static void __acpi_nmi_enable(void *__unused)
+{
+ apic_write(APIC_LVT0, APIC_DM_NMI);
+}
+
+/*
+ * Enable timer based NMIs on all CPUs:
+ */
+void acpi_nmi_enable(void)
+{
+ if (atomic_read(&nmi_active) && nmi_watchdog == NMI_IO_APIC)
+ on_each_cpu(__acpi_nmi_enable, NULL, 0, 1);
+}
+
+static void __acpi_nmi_disable(void *__unused)
+{
+ apic_write(APIC_LVT0, APIC_DM_NMI | APIC_LVT_MASKED);
+}
+
+/*
+ * Disable timer based NMIs on all CPUs:
+ */
+void acpi_nmi_disable(void)
+{
+ if (atomic_read(&nmi_active) && nmi_watchdog == NMI_IO_APIC)
+ on_each_cpu(__acpi_nmi_disable, NULL, 0, 1);
+}
+
void setup_apic_nmi_watchdog(void *unused)
{
- if (__get_cpu_var(wd_enabled) == 1)
+ if (__get_cpu_var(wd_enabled))
return;
/* cheap hack to support suspend/resume */
@@ -310,8 +310,9 @@ void touch_nmi_watchdog(void)
}
}
- touch_softlockup_watchdog();
+ touch_softlockup_watchdog();
}
+EXPORT_SYMBOL(touch_nmi_watchdog);
int __kprobes nmi_watchdog_tick(struct pt_regs * regs, unsigned reason)
{
@@ -478,4 +479,3 @@ void __trigger_all_cpu_backtrace(void)
EXPORT_SYMBOL(nmi_active);
EXPORT_SYMBOL(nmi_watchdog);
-EXPORT_SYMBOL(touch_nmi_watchdog);
--
1.5.3.4
-
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