mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-22 20:23:57 +08:00
9579f5bd31
This provides the ability to inject artifical errors to memory hotplug notifier chain callbacks. It is controlled through debugfs interface under /sys/kernel/debug/notifier-error-inject/memory If the notifier call chain should be failed with some events notified, write the error code to "actions/<notifier event>/error". Example: Inject memory hotplug offline error (-12 == -ENOMEM) # cd /sys/kernel/debug/notifier-error-inject/memory # echo -12 > actions/MEM_GOING_OFFLINE/error # echo offline > /sys/devices/system/memory/memoryXXX/state bash: echo: write error: Cannot allocate memory Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com> Cc: Pavel Machek <pavel@ucw.cz> Cc: "Rafael J. Wysocki" <rjw@sisk.pl> Cc: Greg KH <greg@kroah.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Michael Ellerman <michael@ellerman.id.au> Cc: Dave Jones <davej@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
49 lines
1.1 KiB
C
49 lines
1.1 KiB
C
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/memory.h>
|
|
|
|
#include "notifier-error-inject.h"
|
|
|
|
static int priority;
|
|
module_param(priority, int, 0);
|
|
MODULE_PARM_DESC(priority, "specify memory notifier priority");
|
|
|
|
static struct notifier_err_inject memory_notifier_err_inject = {
|
|
.actions = {
|
|
{ NOTIFIER_ERR_INJECT_ACTION(MEM_GOING_ONLINE) },
|
|
{ NOTIFIER_ERR_INJECT_ACTION(MEM_GOING_OFFLINE) },
|
|
{}
|
|
}
|
|
};
|
|
|
|
static struct dentry *dir;
|
|
|
|
static int err_inject_init(void)
|
|
{
|
|
int err;
|
|
|
|
dir = notifier_err_inject_init("memory", notifier_err_inject_dir,
|
|
&memory_notifier_err_inject, priority);
|
|
if (IS_ERR(dir))
|
|
return PTR_ERR(dir);
|
|
|
|
err = register_memory_notifier(&memory_notifier_err_inject.nb);
|
|
if (err)
|
|
debugfs_remove_recursive(dir);
|
|
|
|
return err;
|
|
}
|
|
|
|
static void err_inject_exit(void)
|
|
{
|
|
unregister_memory_notifier(&memory_notifier_err_inject.nb);
|
|
debugfs_remove_recursive(dir);
|
|
}
|
|
|
|
module_init(err_inject_init);
|
|
module_exit(err_inject_exit);
|
|
|
|
MODULE_DESCRIPTION("memory notifier error injection module");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Akinobu Mita <akinobu.mita@gmail.com>");
|