Release 4.13 include/linux/shm.h

#ifndef _LINUX_SHM_H_

#define _LINUX_SHM_H_

#include <linux/list.h>
#include <asm/page.h>
#include <uapi/linux/shm.h>
#include <asm/shmparam.h>


struct shmid_kernel /* private to the kernel */
{	
	
struct kern_ipc_perm	shm_perm;
	
struct file		*shm_file;
	
unsigned long		shm_nattch;
	
unsigned long		shm_segsz;
	
time_t			shm_atim;
	
time_t			shm_dtim;
	
time_t			shm_ctim;
	
pid_t			shm_cprid;
	
pid_t			shm_lprid;
	
struct user_struct	*mlock_user;

	/* The task created the shm object.  NULL if the task is dead. */
	
struct task_struct	*shm_creator;
	
struct list_head	shm_clist;	/* list by creator */

} __randomize_layout;

/* shm_mode upper byte flags */

#define	SHM_DEST	01000	
/* segment will be destroyed on last detach */

#define SHM_LOCKED      02000   
/* segment will not be swapped */

#define SHM_HUGETLB     04000   
/* segment will use huge TLB pages */

#define SHM_NORESERVE   010000  
/* don't check for reservations */

/* Bits [26:31] are reserved */

/*
 * When SHM_HUGETLB is set bits [26:31] encode the log2 of the huge page size.
 * This gives us 6 bits, which is enough until someone invents 128 bit address
 * spaces.
 *
 * Assume these are all power of twos.
 * When 0 use the default page size.
 */

#define SHM_HUGE_SHIFT  26

#define SHM_HUGE_MASK   0x3f

#define SHM_HUGE_2MB    (21 << SHM_HUGE_SHIFT)

#define SHM_HUGE_1GB    (30 << SHM_HUGE_SHIFT)

#ifdef CONFIG_SYSVIPC

struct sysv_shm {
	
struct list_head shm_clist;
};

long do_shmat(int shmid, char __user *shmaddr, int shmflg, unsigned long *addr,
	      unsigned long shmlba);
bool is_file_shm_hugepages(struct file *file);
void exit_shm(struct task_struct *task);

#define shm_init_task(task) INIT_LIST_HEAD(&(task)->sysvshm.shm_clist)
#else

struct sysv_shm {
	/* empty */
};



static inline long do_shmat(int shmid, char __user *shmaddr,
			    int shmflg, unsigned long *addr,
			    unsigned long shmlba)
{
	return -ENOSYS;
}
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Will Deacon
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Andrew Morton
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1
33.33%
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31
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3
100.00%



static inline bool is_file_shm_hugepages(struct file *file)
{
	return false;
}
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15
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2
100.00%



static inline void exit_shm(struct task_struct *task)
{
}
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static inline void shm_init_task(struct task_struct *task)
{
}
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#endif

#endif /* _LINUX_SHM_H_ */
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6
26.09%
Jack Miller
41
16.14%
1
4.35%
Greg Kroah-Hartman
38
14.96%
1
4.35%
Manfred Spraul
34
13.39%
1
4.35%
Vasiliy Kulikov
26
10.24%
2
8.70%
Adam Litke
21
8.27%
1
4.35%
Andi Kleen
18
7.09%
1
4.35%
Will Deacon
8
3.15%
1
4.35%
Andrew Morton
6
2.36%
2
8.70%
Rik Van Riel
5
1.97%
1
4.35%
Badari Pulavarty
5
1.97%
1
4.35%
Yaowei Bai
3
1.18%
1
4.35%
Kirill A. Shutemov
2
0.79%
1
4.35%
Linus Torvalds
1
0.39%
1
4.35%
David Howells
1
0.39%
1
4.35%
Kees Cook
1
0.39%
1
4.35%
Total
254
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23
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Directory: include/linux

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