include/linux/shm.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _LINUX_SHM_H_
   3 #define _LINUX_SHM_H_
   4
   5 #include <linux/list.h>
   6 #include <asm/page.h>
   7 #include <uapi/linux/shm.h>
   8 #include <asm/shmparam.h>
   9
  10 struct file;
  11
  12 #ifdef CONFIG_SYSVIPC
  13 struct sysv_shm {
  14         struct list_head shm_clist;
  15 };
  16
  17 long do_shmat(int shmid, char __user *shmaddr, int shmflg, unsigned long *addr,
  18               unsigned long shmlba);
  19 bool is_file_shm_hugepages(struct file *file);
  20 void exit_shm(struct task_struct *task);
  21 #define shm_init_task(task) INIT_LIST_HEAD(&(task)->sysvshm.shm_clist)
  22 #else
  23 struct sysv_shm {
  24         /* empty */
  25 };
  26
  27 static inline long do_shmat(int shmid, char __user *shmaddr,
  28                             int shmflg, unsigned long *addr,
  29                             unsigned long shmlba)
  30 {
  31         return -ENOSYS;
  32 }
  33 static inline bool is_file_shm_hugepages(struct file *file)
  34 {
  35         return false;
  36 }
  37 static inline void exit_shm(struct task_struct *task)
  38 {
  39 }
  40 static inline void shm_init_task(struct task_struct *task)
  41 {
  42 }
  43 #endif
  44
  45 #endif /* _LINUX_SHM_H_ */