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git.proxmox.com Git - mirror_ubuntu-zesty-kernel.git/blob - include/linux/shm.h
5 #include <uapi/linux/shm.h>
6 #include <asm/shmparam.h>
8 struct shmid_kernel
/* private to the kernel */
10 struct kern_ipc_perm shm_perm
;
11 struct file
*shm_file
;
12 unsigned long shm_nattch
;
13 unsigned long shm_segsz
;
19 struct user_struct
*mlock_user
;
21 /* The task created the shm object. NULL if the task is dead. */
22 struct task_struct
*shm_creator
;
25 /* shm_mode upper byte flags */
26 #define SHM_DEST 01000 /* segment will be destroyed on last detach */
27 #define SHM_LOCKED 02000 /* segment will not be swapped */
28 #define SHM_HUGETLB 04000 /* segment will use huge TLB pages */
29 #define SHM_NORESERVE 010000 /* don't check for reservations */
31 /* Bits [26:31] are reserved */
34 * When SHM_HUGETLB is set bits [26:31] encode the log2 of the huge page size.
35 * This gives us 6 bits, which is enough until someone invents 128 bit address
38 * Assume these are all power of twos.
39 * When 0 use the default page size.
41 #define SHM_HUGE_SHIFT 26
42 #define SHM_HUGE_MASK 0x3f
43 #define SHM_HUGE_2MB (21 << SHM_HUGE_SHIFT)
44 #define SHM_HUGE_1GB (30 << SHM_HUGE_SHIFT)
47 long do_shmat(int shmid
, char __user
*shmaddr
, int shmflg
, unsigned long *addr
,
48 unsigned long shmlba
);
49 extern int is_file_shm_hugepages(struct file
*file
);
50 extern void exit_shm(struct task_struct
*task
);
52 static inline long do_shmat(int shmid
, char __user
*shmaddr
,
53 int shmflg
, unsigned long *addr
,
58 static inline int is_file_shm_hugepages(struct file
*file
)
62 static inline void exit_shm(struct task_struct
*task
)
67 #endif /* _LINUX_SHM_H_ */