The patch titled
cpu hotplug: msr: fix cpu hotplug error handling
has been removed from the -mm tree. Its filename was
cpu-hotplug-msr-fix-cpu-hotplug-error-handling.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
Subject: cpu hotplug: msr: fix cpu hotplug error handling
From: Akinobu Mita <akinobu.mita@xxxxxxxxx>
Do msr_device_create() in CPU_UP_PREPARE instead of CPU_ONLINE.
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Signed-off-by: Akinobu Mita <akinobu.mita@xxxxxxxxx>
Cc: Gautham R Shenoy <ego@xxxxxxxxxx>
Cc: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: Andi Kleen <ak@xxxxxxx>
Cc: Jan Beulich <jbeulich@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/x86/kernel/msr.c | 35 ++++++++++++++++++++---------------
1 file changed, 20 insertions(+), 15 deletions(-)
diff -puN arch/x86/kernel/msr.c~cpu-hotplug-msr-fix-cpu-hotplug-error-handling arch/x86/kernel/msr.c
--- a/arch/x86/kernel/msr.c~cpu-hotplug-msr-fix-cpu-hotplug-error-handling
+++ a/arch/x86/kernel/msr.c
@@ -133,37 +133,42 @@ static const struct file_operations msr_
.open = msr_open,
};
-static int __cpuinit msr_device_create(int i)
+static int msr_device_create(int cpu)
{
- int err = 0;
struct device *dev;
- dev = device_create(msr_class, NULL, MKDEV(MSR_MAJOR, i), "msr%d",i);
- if (IS_ERR(dev))
- err = PTR_ERR(dev);
- return err;
+ dev = device_create(msr_class, NULL, MKDEV(MSR_MAJOR, cpu),
+ "msr%d", cpu);
+ return IS_ERR(dev) ? PTR_ERR(dev) : 0;
+}
+
+static void msr_device_destroy(int cpu)
+{
+ device_destroy(msr_class, MKDEV(MSR_MAJOR, cpu));
}
static int __cpuinit msr_class_cpu_callback(struct notifier_block *nfb,
unsigned long action, void *hcpu)
{
unsigned int cpu = (unsigned long)hcpu;
+ int err = 0;
switch (action) {
- case CPU_ONLINE:
- case CPU_ONLINE_FROZEN:
- msr_device_create(cpu);
+ case CPU_UP_PREPARE:
+ case CPU_UP_PREPARE_FROZEN:
+ err = msr_device_create(cpu);
break;
+ case CPU_UP_CANCELED:
+ case CPU_UP_CANCELED_FROZEN:
case CPU_DEAD:
case CPU_DEAD_FROZEN:
- device_destroy(msr_class, MKDEV(MSR_MAJOR, cpu));
+ msr_device_destroy(cpu);
break;
}
- return NOTIFY_OK;
+ return err ? NOTIFY_BAD : NOTIFY_OK;
}
-static struct notifier_block __cpuinitdata msr_class_cpu_notifier =
-{
+static struct notifier_block __cpuinitdata msr_class_cpu_notifier = {
.notifier_call = msr_class_cpu_callback,
};
@@ -196,7 +201,7 @@ static int __init msr_init(void)
out_class:
i = 0;
for_each_online_cpu(i)
- device_destroy(msr_class, MKDEV(MSR_MAJOR, i));
+ msr_device_destroy(i);
class_destroy(msr_class);
out_chrdev:
unregister_chrdev(MSR_MAJOR, "cpu/msr");
@@ -208,7 +213,7 @@ static void __exit msr_exit(void)
{
int cpu = 0;
for_each_online_cpu(cpu)
- device_destroy(msr_class, MKDEV(MSR_MAJOR, cpu));
+ msr_device_destroy(cpu);
class_destroy(msr_class);
unregister_chrdev(MSR_MAJOR, "cpu/msr");
unregister_hotcpu_notifier(&msr_class_cpu_notifier);
_
Patches currently in -mm which might be from akinobu.mita@xxxxxxxxx are
origin.patch
git-x86.patch
-
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