1#ifndef _LINUX_SHM_H_ 2#define _LINUX_SHM_H_ 3 4#include <asm/page.h> 5#include <uapi/linux/shm.h> 6 7#define SHMALL (SHMMAX/PAGE_SIZE*(SHMMNI/16)) /* max shm system wide (pages) */ 8#include <asm/shmparam.h> 9struct shmid_kernel /* private to the kernel */ 10{ 11 struct kern_ipc_perm shm_perm; 12 struct file * shm_file; 13 unsigned long shm_nattch; 14 unsigned long shm_segsz; 15 time_t shm_atim; 16 time_t shm_dtim; 17 time_t shm_ctim; 18 pid_t shm_cprid; 19 pid_t shm_lprid; 20 struct user_struct *mlock_user; 21 22 /* The task created the shm object. NULL if the task is dead. */ 23 struct task_struct *shm_creator; 24}; 25 26/* shm_mode upper byte flags */ 27#define SHM_DEST 01000 /* segment will be destroyed on last detach */ 28#define SHM_LOCKED 02000 /* segment will not be swapped */ 29#define SHM_HUGETLB 04000 /* segment will use huge TLB pages */ 30#define SHM_NORESERVE 010000 /* don't check for reservations */ 31 32#ifdef CONFIG_SYSVIPC 33long do_shmat(int shmid, char __user *shmaddr, int shmflg, unsigned long *addr, 34 unsigned long shmlba); 35extern int is_file_shm_hugepages(struct file *file); 36extern void exit_shm(struct task_struct *task); 37#else 38static inline long do_shmat(int shmid, char __user *shmaddr, 39 int shmflg, unsigned long *addr, 40 unsigned long shmlba) 41{ 42 return -ENOSYS; 43} 44static inline int is_file_shm_hugepages(struct file *file) 45{ 46 return 0; 47} 48static inline void exit_shm(struct task_struct *task) 49{ 50} 51#endif 52 53#endif /* _LINUX_SHM_H_ */ 54