diff options
Diffstat (limited to 'include/linux/ipc_namespace.h')
| -rw-r--r-- | include/linux/ipc_namespace.h | 43 |
1 files changed, 41 insertions, 2 deletions
diff --git a/include/linux/ipc_namespace.h b/include/linux/ipc_namespace.h index 878d7ac286fa..cfb2a08b28f5 100644 --- a/include/linux/ipc_namespace.h +++ b/include/linux/ipc_namespace.h @@ -4,6 +4,17 @@ #include <linux/err.h> #include <linux/idr.h> #include <linux/rwsem.h> +#ifdef CONFIG_MEMORY_HOTPLUG +#include <linux/notifier.h> +#endif /* CONFIG_MEMORY_HOTPLUG */ + +/* + * ipc namespace events + */ +#define IPCNS_MEMCHANGED 0x00000001 /* Notify lowmem size changed */ + +#define IPCNS_CALLBACK_PRI 0 + struct ipc_ids { int in_use; @@ -30,6 +41,10 @@ struct ipc_namespace { size_t shm_ctlall; int shm_ctlmni; int shm_tot; + +#ifdef CONFIG_MEMORY_HOTPLUG + struct notifier_block ipcns_nb; +#endif }; extern struct ipc_namespace init_ipc_ns; @@ -37,9 +52,33 @@ extern atomic_t nr_ipc_ns; #ifdef CONFIG_SYSVIPC #define INIT_IPC_NS(ns) .ns = &init_ipc_ns, -#else + +#ifdef CONFIG_MEMORY_HOTPLUG + +extern int register_ipcns_notifier(struct ipc_namespace *); +extern int unregister_ipcns_notifier(struct ipc_namespace *); +extern int ipcns_notify(unsigned long); + +#else /* CONFIG_MEMORY_HOTPLUG */ + +static inline int register_ipcns_notifier(struct ipc_namespace *ipcns) +{ + return 0; +} +static inline int unregister_ipcns_notifier(struct ipc_namespace *ipcns) +{ + return 0; +} +static inline int ipcns_notify(unsigned long ev) +{ + return 0; +} + +#endif /* CONFIG_MEMORY_HOTPLUG */ + +#else /* CONFIG_SYSVIPC */ #define INIT_IPC_NS(ns) -#endif +#endif /* CONFIG_SYSVIPC */ #if defined(CONFIG_SYSVIPC) && defined(CONFIG_IPC_NS) extern void free_ipc_ns(struct kref *kref); |