fault-injection: add CPU notifier error injection module
I used this module to test the series of modification to the cpu notifiers code. Example1: inject CPU offline error (-1 == -EPERM) # modprobe cpu-notifier-error-inject cpu_down_prepare_error=-1 # echo 0 > /sys/devices/system/cpu/cpu1/online bash: echo: write error: Operation not permitted Example2: inject CPU online error (-2 == -ENOENT) # modprobe cpu-notifier-error-inject cpu_up_prepare_error=-2 # echo 1 > /sys/devices/system/cpu/cpu1/online bash: echo: write error: No such file or directory [akpm@linux-foundation.org: fix Kconfig help text] Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
parent
55af6bb509
commit
c9d221f86e
|
@ -898,6 +898,18 @@ config LKDTM
|
|||
Documentation on how to use the module can be found in
|
||||
Documentation/fault-injection/provoke-crashes.txt
|
||||
|
||||
config CPU_NOTIFIER_ERROR_INJECT
|
||||
tristate "CPU notifier error injection module"
|
||||
depends on HOTPLUG_CPU && DEBUG_KERNEL
|
||||
help
|
||||
This option provides a kernel module that can be used to test
|
||||
the error handling of the cpu notifiers
|
||||
|
||||
To compile this code as a module, choose M here: the module will
|
||||
be called cpu-notifier-error-inject.
|
||||
|
||||
If unsure, say N.
|
||||
|
||||
config FAULT_INJECTION
|
||||
bool "Fault-injection framework"
|
||||
depends on DEBUG_KERNEL
|
||||
|
|
|
@ -85,6 +85,7 @@ obj-$(CONFIG_AUDIT_GENERIC) += audit.o
|
|||
obj-$(CONFIG_SWIOTLB) += swiotlb.o
|
||||
obj-$(CONFIG_IOMMU_HELPER) += iommu-helper.o
|
||||
obj-$(CONFIG_FAULT_INJECTION) += fault-inject.o
|
||||
obj-$(CONFIG_CPU_NOTIFIER_ERROR_INJECT) += cpu-notifier-error-inject.o
|
||||
|
||||
lib-$(CONFIG_GENERIC_BUG) += bug.o
|
||||
|
||||
|
|
|
@ -0,0 +1,63 @@
|
|||
#include <linux/kernel.h>
|
||||
#include <linux/cpu.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/notifier.h>
|
||||
|
||||
static int priority;
|
||||
static int cpu_up_prepare_error;
|
||||
static int cpu_down_prepare_error;
|
||||
|
||||
module_param(priority, int, 0);
|
||||
MODULE_PARM_DESC(priority, "specify cpu notifier priority");
|
||||
|
||||
module_param(cpu_up_prepare_error, int, 0644);
|
||||
MODULE_PARM_DESC(cpu_up_prepare_error,
|
||||
"specify error code to inject CPU_UP_PREPARE action");
|
||||
|
||||
module_param(cpu_down_prepare_error, int, 0644);
|
||||
MODULE_PARM_DESC(cpu_down_prepare_error,
|
||||
"specify error code to inject CPU_DOWN_PREPARE action");
|
||||
|
||||
static int err_inject_cpu_callback(struct notifier_block *nfb,
|
||||
unsigned long action, void *hcpu)
|
||||
{
|
||||
int err = 0;
|
||||
|
||||
switch (action) {
|
||||
case CPU_UP_PREPARE:
|
||||
case CPU_UP_PREPARE_FROZEN:
|
||||
err = cpu_up_prepare_error;
|
||||
break;
|
||||
case CPU_DOWN_PREPARE:
|
||||
case CPU_DOWN_PREPARE_FROZEN:
|
||||
err = cpu_down_prepare_error;
|
||||
break;
|
||||
}
|
||||
if (err)
|
||||
printk(KERN_INFO "Injecting error (%d) at cpu notifier\n", err);
|
||||
|
||||
return notifier_from_errno(err);
|
||||
}
|
||||
|
||||
static struct notifier_block err_inject_cpu_notifier = {
|
||||
.notifier_call = err_inject_cpu_callback,
|
||||
};
|
||||
|
||||
static int err_inject_init(void)
|
||||
{
|
||||
err_inject_cpu_notifier.priority = priority;
|
||||
|
||||
return register_hotcpu_notifier(&err_inject_cpu_notifier);
|
||||
}
|
||||
|
||||
static void err_inject_exit(void)
|
||||
{
|
||||
unregister_hotcpu_notifier(&err_inject_cpu_notifier);
|
||||
}
|
||||
|
||||
module_init(err_inject_init);
|
||||
module_exit(err_inject_exit);
|
||||
|
||||
MODULE_DESCRIPTION("CPU notifier error injection module");
|
||||
MODULE_LICENSE("GPL");
|
||||
MODULE_AUTHOR("Akinobu Mita <akinobu.mita@gmail.com>");
|
Loading…
Reference in New Issue