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author | Stephen Rothwell <sfr@canb.auug.org.au> | 2009-11-26 13:23:51 +1100 |
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committer | Stephen Rothwell <sfr@canb.auug.org.au> | 2009-11-26 13:23:51 +1100 |
commit | 81062a190e2e78bac24e657168605cd6bde84514 (patch) | |
tree | df539c24a59d643e80b163d6ad3ba73848695acc /include/linux/user-return-notifier.h | |
parent | 577d7f1a9a54913946e67bdac733857ef8ac8e07 (diff) | |
parent | 0b3d6a50aa8bd56f80e70139463a462776425d71 (diff) |
Merge remote branch 'kvm/linux-next'
Diffstat (limited to 'include/linux/user-return-notifier.h')
-rw-r--r-- | include/linux/user-return-notifier.h | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/include/linux/user-return-notifier.h b/include/linux/user-return-notifier.h new file mode 100644 index 000000000000..b6ac056291d7 --- /dev/null +++ b/include/linux/user-return-notifier.h @@ -0,0 +1,42 @@ +#ifndef _LINUX_USER_RETURN_NOTIFIER_H +#define _LINUX_USER_RETURN_NOTIFIER_H + +#ifdef CONFIG_USER_RETURN_NOTIFIER + +#include <linux/list.h> +#include <linux/sched.h> + +struct user_return_notifier { + void (*on_user_return)(struct user_return_notifier *urn); + struct hlist_node link; +}; + + +void user_return_notifier_register(struct user_return_notifier *urn); +void user_return_notifier_unregister(struct user_return_notifier *urn); + +static inline void propagate_user_return_notify(struct task_struct *prev, + struct task_struct *next) +{ + if (test_tsk_thread_flag(prev, TIF_USER_RETURN_NOTIFY)) { + clear_tsk_thread_flag(prev, TIF_USER_RETURN_NOTIFY); + set_tsk_thread_flag(next, TIF_USER_RETURN_NOTIFY); + } +} + +void fire_user_return_notifiers(void); + +#else + +struct user_return_notifier {}; + +static inline void propagate_user_return_notify(struct task_struct *prev, + struct task_struct *next) +{ +} + +static inline void fire_user_return_notifiers(void) {} + +#endif + +#endif |