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cpu/hotplug: Remove obsolete cpu hotplug register/unregister functions

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hotcpu_notifier(), cpu_notifier(), __hotcpu_notifier(), __cpu_notifier(),
register_hotcpu_notifier(), register_cpu_notifier(),
__register_hotcpu_notifier(), __register_cpu_notifier(),
unregister_hotcpu_notifier(), unregister_cpu_notifier(),
__unregister_hotcpu_notifier(), __unregister_cpu_notifier()

are unused now. Remove them and all related code.

Remove also the now pointless cpu notifier error injection mechanism. The
states can be executed step by step and error rollback is the same as cpu
down, so any state transition can be tested w/o requiring the notifier
error injection.

Some CPU hotplug states are kept as they are (ab)used for hotplug state
tracking.

Signed-off-by: Sebastian Andrzej Siewior <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: [email protected]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Thomas Gleixner <[email protected]>
This commit is contained in:
Thomas Gleixner 2016-12-21 20:19:53 +01:00
commit 530e9b76ae
6 changed files with 1 additions and 340 deletions
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24
lib/Kconfig.debug
View file

@ -1538,30 +1538,6 @@ config NOTIFIER_ERROR_INJECTION
Say N if unsure.
config CPU_NOTIFIER_ERROR_INJECT
tristate "CPU notifier error injection module"
depends on HOTPLUG_CPU && NOTIFIER_ERROR_INJECTION
help
This option provides a kernel module that can be used to test
the error handling of the cpu notifiers by injecting artificial
errors to CPU notifier chain callbacks. It is controlled through
debugfs interface under /sys/kernel/debug/notifier-error-inject/cpu
If the notifier call chain should be failed with some events
notified, write the error code to "actions/<notifier event>/error".
Example: Inject CPU offline error (-1 == -EPERM)
# cd /sys/kernel/debug/notifier-error-inject/cpu
# echo -1 > actions/CPU_DOWN_PREPARE/error
# echo 0 > /sys/devices/system/cpu/cpu1/online
bash: echo: write error: Operation not permitted
To compile this code as a module, choose M here: the module will
be called cpu-notifier-error-inject.
If unsure, say N.
config PM_NOTIFIER_ERROR_INJECT
tristate "PM notifier error injection module"
depends on PM && NOTIFIER_ERROR_INJECTION

1
lib/Makefile
View file

@ -128,7 +128,6 @@ obj-$(CONFIG_SWIOTLB) += swiotlb.o
obj-$(CONFIG_IOMMU_HELPER) += iommu-helper.o iommu-common.o
obj-$(CONFIG_FAULT_INJECTION) += fault-inject.o
obj-$(CONFIG_NOTIFIER_ERROR_INJECTION) += notifier-error-inject.o
obj-$(CONFIG_CPU_NOTIFIER_ERROR_INJECT) += cpu-notifier-error-inject.o
obj-$(CONFIG_PM_NOTIFIER_ERROR_INJECT) += pm-notifier-error-inject.o
obj-$(CONFIG_NETDEV_NOTIFIER_ERROR_INJECT) += netdev-notifier-error-inject.o
obj-$(CONFIG_MEMORY_NOTIFIER_ERROR_INJECT) += memory-notifier-error-inject.o

84
lib/cpu-notifier-error-inject.c
View file

@ -1,84 +0,0 @@
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/cpu.h>
#include "notifier-error-inject.h"
static int priority;
module_param(priority, int, 0);
MODULE_PARM_DESC(priority, "specify cpu notifier priority");
#define UP_PREPARE 0
#define UP_PREPARE_FROZEN 0
#define DOWN_PREPARE 0
#define DOWN_PREPARE_FROZEN 0
static struct notifier_err_inject cpu_notifier_err_inject = {
.actions = {
{ NOTIFIER_ERR_INJECT_ACTION(UP_PREPARE) },
{ NOTIFIER_ERR_INJECT_ACTION(UP_PREPARE_FROZEN) },
{ NOTIFIER_ERR_INJECT_ACTION(DOWN_PREPARE) },
{ NOTIFIER_ERR_INJECT_ACTION(DOWN_PREPARE_FROZEN) },
{}
}
};
static int notf_err_handle(struct notifier_err_inject_action *action)
{
int ret;
ret = action->error;
if (ret)
pr_info("Injecting error (%d) to %s\n", ret, action->name);
return ret;
}
static int notf_err_inj_up_prepare(unsigned int cpu)
{
if (!cpuhp_tasks_frozen)
return notf_err_handle(&cpu_notifier_err_inject.actions[0]);
else
return notf_err_handle(&cpu_notifier_err_inject.actions[1]);
}
static int notf_err_inj_dead(unsigned int cpu)
{
if (!cpuhp_tasks_frozen)
return notf_err_handle(&cpu_notifier_err_inject.actions[2]);
else
return notf_err_handle(&cpu_notifier_err_inject.actions[3]);
}
static struct dentry *dir;
static int err_inject_init(void)
{
int err;
dir = notifier_err_inject_init("cpu", notifier_err_inject_dir,
&cpu_notifier_err_inject, priority);
if (IS_ERR(dir))
return PTR_ERR(dir);
err = cpuhp_setup_state_nocalls(CPUHP_NOTF_ERR_INJ_PREPARE,
"cpu-err-notif:prepare",
notf_err_inj_up_prepare,
notf_err_inj_dead);
if (err)
debugfs_remove_recursive(dir);
return err;
}
static void err_inject_exit(void)
{
cpuhp_remove_state_nocalls(CPUHP_NOTF_ERR_INJ_PREPARE);
debugfs_remove_recursive(dir);
}
module_init(err_inject_init);
module_exit(err_inject_exit);
MODULE_DESCRIPTION("CPU notifier error injection module");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Akinobu Mita <[email protected]>");