https://github.com/torvalds/linux
Revision 6111da3432b10b2c56a21a5d8671aee46435326d authored by Linus Torvalds on 27 September 2014, 23:45:33 UTC, committed by Linus Torvalds on 27 September 2014, 23:45:33 UTC
Pull cgroup fixes from Tejun Heo: "This is quite late but these need to be backported anyway. This is the fix for a long-standing cpuset bug which existed from 2009. cpuset makes use of PF_SPREAD_{PAGE|SLAB} flags to modify the task's memory allocation behavior according to the settings of the cpuset it belongs to; unfortunately, when those flags have to be changed, cpuset did so directly even whlie the target task is running, which is obviously racy as task->flags may be modified by the task itself at any time. This obscure bug manifested as corrupt PF_USED_MATH flag leading to a weird crash. The bug is fixed by moving the flag to task->atomic_flags. The first two are prepatory ones to help defining atomic_flags accessors and the third one is the actual fix" * 'for-3.17-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup: cpuset: PF_SPREAD_PAGE and PF_SPREAD_SLAB should be atomic flags sched: add macros to define bitops for task atomic flags sched: fix confusing PFA_NO_NEW_PRIVS constant
Tip revision: 6111da3432b10b2c56a21a5d8671aee46435326d authored by Linus Torvalds on 27 September 2014, 23:45:33 UTC
Merge branch 'for-3.17-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup
Merge branch 'for-3.17-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup
Tip revision: 6111da3
pm-notifier-error-inject.c
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/suspend.h>
#include "notifier-error-inject.h"
static int priority;
module_param(priority, int, 0);
MODULE_PARM_DESC(priority, "specify PM notifier priority");
static struct notifier_err_inject pm_notifier_err_inject = {
.actions = {
{ NOTIFIER_ERR_INJECT_ACTION(PM_HIBERNATION_PREPARE) },
{ NOTIFIER_ERR_INJECT_ACTION(PM_SUSPEND_PREPARE) },
{ NOTIFIER_ERR_INJECT_ACTION(PM_RESTORE_PREPARE) },
{}
}
};
static struct dentry *dir;
static int err_inject_init(void)
{
int err;
dir = notifier_err_inject_init("pm", notifier_err_inject_dir,
&pm_notifier_err_inject, priority);
if (IS_ERR(dir))
return PTR_ERR(dir);
err = register_pm_notifier(&pm_notifier_err_inject.nb);
if (err)
debugfs_remove_recursive(dir);
return err;
}
static void err_inject_exit(void)
{
unregister_pm_notifier(&pm_notifier_err_inject.nb);
debugfs_remove_recursive(dir);
}
module_init(err_inject_init);
module_exit(err_inject_exit);
MODULE_DESCRIPTION("PM notifier error injection module");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Akinobu Mita <akinobu.mita@gmail.com>");
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