[mirror_ubuntu-bionic-kernel.git] / include / linux / mm_types.h

#ifndef _LINUX_MM_TYPES_H
#define _LINUX_MM_TYPES_H

#include <linux/auxvec.h>
#include <linux/types.h>
#include <linux/threads.h>
#include <linux/list.h>
#include <linux/spinlock.h>
#include <linux/prio_tree.h>
#include <linux/rbtree.h>
#include <linux/rwsem.h>
#include <linux/completion.h>
#include <linux/cpumask.h>
#include <linux/page-debug-flags.h>
#include <asm/page.h>
#include <asm/mmu.h>

#ifndef AT_VECTOR_SIZE_ARCH
#define AT_VECTOR_SIZE_ARCH 0
#endif
#define AT_VECTOR_SIZE (2*(AT_VECTOR_SIZE_ARCH + AT_VECTOR_SIZE_BASE + 1))

struct address_space;

#define USE_SPLIT_PTLOCKS	(NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS)

/*
 * Each physical page in the system has a struct page associated with
 * it to keep track of whatever it is we are using the page for at the
 * moment. Note that we have no way to track which tasks are using
 * a page, though if it is a pagecache page, rmap structures can tell us
 * who is mapping it.
 */
struct page {
	unsigned long flags;		/* Atomic flags, some possibly
					 * updated asynchronously */
	atomic_t _count;		/* Usage count, see below. */
	union {
		atomic_t _mapcount;	/* Count of ptes mapped in mms,
					 * to show when page is mapped
					 * & limit reverse map searches.
					 */
		struct {		/* SLUB */
			unsigned inuse:16;
			unsigned objects:15;
			unsigned frozen:1;
		};
	};
	union {
	    struct {
		unsigned long private;		/* Mapping-private opaque data:
					 	 * usually used for buffer_heads
						 * if PagePrivate set; used for
						 * swp_entry_t if PageSwapCache;
						 * indicates order in the buddy
						 * system if PG_buddy is set.
						 */
		struct address_space *mapping;	/* If low bit clear, points to
						 * inode address_space, or NULL.
						 * If page mapped as anonymous
						 * memory, low bit is set, and
						 * it points to anon_vma object:
						 * see PAGE_MAPPING_ANON below.
						 */
	    };
#if USE_SPLIT_PTLOCKS
	    spinlock_t ptl;
#endif
	    struct kmem_cache *slab;	/* SLUB: Pointer to slab */
	    struct page *first_page;	/* Compound tail pages */
	};
	union {
		pgoff_t index;		/* Our offset within mapping. */
		void *freelist;		/* SLUB: freelist req. slab lock */
	};
	struct list_head lru;		/* Pageout list, eg. active_list
					 * protected by zone->lru_lock !
					 */
	/*
	 * On machines where all RAM is mapped into kernel address space,
	 * we can simply calculate the virtual address. On machines with
	 * highmem some memory is mapped into kernel virtual memory
	 * dynamically, so we need a place to store that address.
	 * Note that this field could be 16 bits on x86 ... ;)
	 *
	 * Architectures with slow multiplication can define
	 * WANT_PAGE_VIRTUAL in asm/page.h
	 */
#if defined(WANT_PAGE_VIRTUAL)
	void *virtual;			/* Kernel virtual address (NULL if
					   not kmapped, ie. highmem) */
#endif /* WANT_PAGE_VIRTUAL */
#ifdef CONFIG_WANT_PAGE_DEBUG_FLAGS
	unsigned long debug_flags;	/* Use atomic bitops on this */
#endif

#ifdef CONFIG_KMEMCHECK
	/*
	 * kmemcheck wants to track the status of each byte in a page; this
	 * is a pointer to such a status block. NULL if not tracked.
	 */
	void *shadow;
#endif
};

typedef unsigned long __nocast vm_flags_t;

/*
 * A region containing a mapping of a non-memory backed file under NOMMU
 * conditions.  These are held in a global tree and are pinned by the VMAs that
 * map parts of them.
 */
struct vm_region {
	struct rb_node	vm_rb;		/* link in global region tree */
	vm_flags_t	vm_flags;	/* VMA vm_flags */
	unsigned long	vm_start;	/* start address of region */
	unsigned long	vm_end;		/* region initialised to here */
	unsigned long	vm_top;		/* region allocated to here */
	unsigned long	vm_pgoff;	/* the offset in vm_file corresponding to vm_start */
	struct file	*vm_file;	/* the backing file or NULL */

	int		vm_usage;	/* region usage count (access under nommu_region_sem) */
	bool		vm_icache_flushed : 1; /* true if the icache has been flushed for
						* this region */
};

/*
 * This struct defines a memory VMM memory area. There is one of these
 * per VM-area/task.  A VM area is any part of the process virtual memory
 * space that has a special rule for the page-fault handlers (ie a shared
 * library, the executable area etc).
 */
struct vm_area_struct {
	struct mm_struct * vm_mm;	/* The address space we belong to. */
	unsigned long vm_start;		/* Our start address within vm_mm. */
	unsigned long vm_end;		/* The first byte after our end address
					   within vm_mm. */

	/* linked list of VM areas per task, sorted by address */
	struct vm_area_struct *vm_next, *vm_prev;

	pgprot_t vm_page_prot;		/* Access permissions of this VMA. */
	unsigned long vm_flags;		/* Flags, see mm.h. */

	struct rb_node vm_rb;

	/*
	 * For areas with an address space and backing store,
	 * linkage into the address_space->i_mmap prio tree, or
	 * linkage to the list of like vmas hanging off its node, or
	 * linkage of vma in the address_space->i_mmap_nonlinear list.
	 */
	union {
		struct {
			struct list_head list;
			void *parent;	/* aligns with prio_tree_node parent */
			struct vm_area_struct *head;
		} vm_set;

		struct raw_prio_tree_node prio_tree_node;
	} shared;

	/*
	 * A file's MAP_PRIVATE vma can be in both i_mmap tree and anon_vma
	 * list, after a COW of one of the file pages.	A MAP_SHARED vma
	 * can only be in the i_mmap tree.  An anonymous MAP_PRIVATE, stack
	 * or brk vma (with NULL file) can only be in an anon_vma list.
	 */
	struct list_head anon_vma_chain; /* Serialized by mmap_sem &
					  * page_table_lock */
	struct anon_vma *anon_vma;	/* Serialized by page_table_lock */

	/* Function pointers to deal with this struct. */
	const struct vm_operations_struct *vm_ops;

	/* Information about our backing store: */
	unsigned long vm_pgoff;		/* Offset (within vm_file) in PAGE_SIZE
					   units, *not* PAGE_CACHE_SIZE */
	struct file * vm_file;		/* File we map to (can be NULL). */
	void * vm_private_data;		/* was vm_pte (shared mem) */

#ifndef CONFIG_MMU
	struct vm_region *vm_region;	/* NOMMU mapping region */
#endif
#ifdef CONFIG_NUMA
	struct mempolicy *vm_policy;	/* NUMA policy for the VMA */
#endif
};

struct core_thread {
	struct task_struct *task;
	struct core_thread *next;
};

struct core_state {
	atomic_t nr_threads;
	struct core_thread dumper;
	struct completion startup;
};

enum {
	MM_FILEPAGES,
	MM_ANONPAGES,
	MM_SWAPENTS,
	NR_MM_COUNTERS
};

#if USE_SPLIT_PTLOCKS && defined(CONFIG_MMU)
#define SPLIT_RSS_COUNTING
/* per-thread cached information, */
struct task_rss_stat {
	int events;	/* for synchronization threshold */
	int count[NR_MM_COUNTERS];
};
#endif /* USE_SPLIT_PTLOCKS */

struct mm_rss_stat {
	atomic_long_t count[NR_MM_COUNTERS];
};

struct mm_struct {
	struct vm_area_struct * mmap;		/* list of VMAs */
	struct rb_root mm_rb;
	struct vm_area_struct * mmap_cache;	/* last find_vma result */
#ifdef CONFIG_MMU
	unsigned long (*get_unmapped_area) (struct file *filp,
				unsigned long addr, unsigned long len,
				unsigned long pgoff, unsigned long flags);
	void (*unmap_area) (struct mm_struct *mm, unsigned long addr);
#endif
	unsigned long mmap_base;		/* base of mmap area */
	unsigned long task_size;		/* size of task vm space */
	unsigned long cached_hole_size; 	/* if non-zero, the largest hole below free_area_cache */
	unsigned long free_area_cache;		/* first hole of size cached_hole_size or larger */
	pgd_t * pgd;
	atomic_t mm_users;			/* How many users with user space? */
	atomic_t mm_count;			/* How many references to "struct mm_struct" (users count as 1) */
	int map_count;				/* number of VMAs */

	spinlock_t page_table_lock;		/* Protects page tables and some counters */
	struct rw_semaphore mmap_sem;

	struct list_head mmlist;		/* List of maybe swapped mm's.	These are globally strung
						 * together off init_mm.mmlist, and are protected
						 * by mmlist_lock
						 */


	unsigned long hiwater_rss;	/* High-watermark of RSS usage */
	unsigned long hiwater_vm;	/* High-water virtual memory usage */

	unsigned long total_vm, locked_vm, shared_vm, exec_vm;
	unsigned long stack_vm, reserved_vm, def_flags, nr_ptes;
	unsigned long start_code, end_code, start_data, end_data;
	unsigned long start_brk, brk, start_stack;
	unsigned long arg_start, arg_end, env_start, env_end;

	unsigned long saved_auxv[AT_VECTOR_SIZE]; /* for /proc/PID/auxv */

	/*
	 * Special counters, in some configurations protected by the
	 * page_table_lock, in other configurations by being atomic.
	 */
	struct mm_rss_stat rss_stat;

	struct linux_binfmt *binfmt;

	cpumask_var_t cpu_vm_mask_var;

	/* Architecture-specific MM context */
	mm_context_t context;

	/* Swap token stuff */
	/*
	 * Last value of global fault stamp as seen by this process.
	 * In other words, this value gives an indication of how long
	 * it has been since this task got the token.
	 * Look at mm/thrash.c
	 */
	unsigned int faultstamp;
	unsigned int token_priority;
	unsigned int last_interval;

	/* How many tasks sharing this mm are OOM_DISABLE */
	atomic_t oom_disable_count;

	unsigned long flags; /* Must use atomic bitops to access the bits */

	struct core_state *core_state; /* coredumping support */
#ifdef CONFIG_AIO
	spinlock_t		ioctx_lock;
	struct hlist_head	ioctx_list;
#endif
#ifdef CONFIG_MM_OWNER
	/*
	 * "owner" points to a task that is regarded as the canonical
	 * user/owner of this mm. All of the following must be true in
	 * order for it to be changed:
	 *
	 * current == mm->owner
	 * current->mm != mm
	 * new_owner->mm == mm
	 * new_owner->alloc_lock is held
	 */
	struct task_struct __rcu *owner;
#endif

	/* store ref to file /proc/<pid>/exe symlink points to */
	struct file *exe_file;
	unsigned long num_exe_file_vmas;
#ifdef CONFIG_MMU_NOTIFIER
	struct mmu_notifier_mm *mmu_notifier_mm;
#endif
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
	pgtable_t pmd_huge_pte; /* protected by page_table_lock */
#endif
#ifdef CONFIG_CPUMASK_OFFSTACK
	struct cpumask cpumask_allocation;
#endif
};

static inline void mm_init_cpumask(struct mm_struct *mm)
{
#ifdef CONFIG_CPUMASK_OFFSTACK
	mm->cpu_vm_mask_var = &mm->cpumask_allocation;
#endif
}

/* Future-safe accessor for struct mm_struct's cpu_vm_mask. */
static inline cpumask_t *mm_cpumask(struct mm_struct *mm)
{
	return mm->cpu_vm_mask_var;
}

#endif /* _LINUX_MM_TYPES_H */
Commit	Line	Data
5b99cd0e HC	1	#ifndef _LINUX_MM_TYPES_H
	2	#define _LINUX_MM_TYPES_H
	3
4f9a58d7	4	#include <linux/auxvec.h>
5b99cd0e HC	5	#include <linux/types.h>
	6	#include <linux/threads.h>
	7	#include <linux/list.h>
	8	#include <linux/spinlock.h>
c92ff1bd MS	9	#include <linux/prio_tree.h>
	10	#include <linux/rbtree.h>
	11	#include <linux/rwsem.h>
	12	#include <linux/completion.h>
cddb8a5c	13	#include <linux/cpumask.h>
6a11f75b	14	#include <linux/page-debug-flags.h>
c92ff1bd MS	15	#include <asm/page.h>
c92ff1bd MS	16	#include <asm/mmu.h>
5b99cd0e	17
4f9a58d7 OH	18	#ifndef AT_VECTOR_SIZE_ARCH
	19	#define AT_VECTOR_SIZE_ARCH 0
	20	#endif
	21	#define AT_VECTOR_SIZE (2*(AT_VECTOR_SIZE_ARCH + AT_VECTOR_SIZE_BASE + 1))
	22
5b99cd0e HC	23	struct address_space;
5b99cd0e HC	24
f7d0b926 JF	25	#define USE_SPLIT_PTLOCKS (NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS)
f7d0b926 JF	26
5b99cd0e HC	27	/*
	28	* Each physical page in the system has a struct page associated with
	29	* it to keep track of whatever it is we are using the page for at the
	30	* moment. Note that we have no way to track which tasks are using
	31	* a page, though if it is a pagecache page, rmap structures can tell us
	32	* who is mapping it.
	33	*/
	34	struct page {
	35	unsigned long flags; /* Atomic flags, some possibly
	36	* updated asynchronously */
	37	atomic_t _count; /* Usage count, see below. */
81819f0f CL	38	union {
81819f0f CL	39	atomic_t _mapcount; /* Count of ptes mapped in mms,
5b99cd0e HC	40	* to show when page is mapped
	41	* & limit reverse map searches.
	42	*/
39b26464	43	struct { /* SLUB */
50d5c41c CL	44	unsigned inuse:16;
	45	unsigned objects:15;
	46	unsigned frozen:1;
39b26464	47	};
81819f0f	48	};
5b99cd0e HC	49	union {
	50	struct {
	51	unsigned long private; /* Mapping-private opaque data:
	52	* usually used for buffer_heads
	53	* if PagePrivate set; used for
	54	* swp_entry_t if PageSwapCache;
	55	* indicates order in the buddy
	56	* system if PG_buddy is set.
	57	*/
	58	struct address_space mapping; / If low bit clear, points to
	59	* inode address_space, or NULL.
	60	* If page mapped as anonymous
	61	* memory, low bit is set, and
	62	* it points to anon_vma object:
	63	* see PAGE_MAPPING_ANON below.
	64	*/
	65	};
f7d0b926	66	#if USE_SPLIT_PTLOCKS
5b99cd0e HC	67	spinlock_t ptl;
5b99cd0e HC	68	#endif
a973e9dd	69	struct kmem_cache slab; / SLUB: Pointer to slab */
8e65d24c	70	struct page first_page; / Compound tail pages */
81819f0f CL	71	};
	72	union {
	73	pgoff_t index; /* Our offset within mapping. */
894b8788	74	void freelist; / SLUB: freelist req. slab lock */
5b99cd0e	75	};
5b99cd0e HC	76	struct list_head lru; /* Pageout list, eg. active_list
	77	* protected by zone->lru_lock !
	78	*/
	79	/*
	80	* On machines where all RAM is mapped into kernel address space,
	81	* we can simply calculate the virtual address. On machines with
	82	* highmem some memory is mapped into kernel virtual memory
	83	* dynamically, so we need a place to store that address.
	84	* Note that this field could be 16 bits on x86 ... ;)
	85	*
	86	* Architectures with slow multiplication can define
	87	* WANT_PAGE_VIRTUAL in asm/page.h
	88	*/
	89	#if defined(WANT_PAGE_VIRTUAL)
	90	void virtual; / Kernel virtual address (NULL if
	91	not kmapped, ie. highmem) */
	92	#endif /* WANT_PAGE_VIRTUAL */
ee3b4290 AM	93	#ifdef CONFIG_WANT_PAGE_DEBUG_FLAGS
	94	unsigned long debug_flags; /* Use atomic bitops on this */
	95	#endif
dfec072e VN	96
	97	#ifdef CONFIG_KMEMCHECK
	98	/*
	99	* kmemcheck wants to track the status of each byte in a page; this
	100	* is a pointer to such a status block. NULL if not tracked.
	101	*/
	102	void *shadow;
	103	#endif
5b99cd0e HC	104	};
5b99cd0e HC	105
ca16d140 KM	106	typedef unsigned long __nocast vm_flags_t;
ca16d140 KM	107
8feae131 DH	108	/*
	109	* A region containing a mapping of a non-memory backed file under NOMMU
	110	* conditions. These are held in a global tree and are pinned by the VMAs that
	111	* map parts of them.
	112	*/
	113	struct vm_region {
	114	struct rb_node vm_rb; /* link in global region tree */
ca16d140	115	vm_flags_t vm_flags; /* VMA vm_flags */
8feae131 DH	116	unsigned long vm_start; /* start address of region */
8feae131 DH	117	unsigned long vm_end; /* region initialised to here */
dd8632a1	118	unsigned long vm_top; /* region allocated to here */
8feae131 DH	119	unsigned long vm_pgoff; /* the offset in vm_file corresponding to vm_start */
	120	struct file vm_file; / the backing file or NULL */
	121
1e2ae599	122	int vm_usage; /* region usage count (access under nommu_region_sem) */
cfe79c00 MF	123	bool vm_icache_flushed : 1; /* true if the icache has been flushed for
cfe79c00 MF	124	* this region */
8feae131 DH	125	};
8feae131 DH	126
c92ff1bd MS	127	/*
	128	* This struct defines a memory VMM memory area. There is one of these
	129	* per VM-area/task. A VM area is any part of the process virtual memory
	130	* space that has a special rule for the page-fault handlers (ie a shared
	131	* library, the executable area etc).
	132	*/
	133	struct vm_area_struct {
	134	struct mm_struct * vm_mm; /* The address space we belong to. */
	135	unsigned long vm_start; /* Our start address within vm_mm. */
	136	unsigned long vm_end; /* The first byte after our end address
	137	within vm_mm. */
	138
	139	/* linked list of VM areas per task, sorted by address */
297c5eee	140	struct vm_area_struct vm_next, vm_prev;
c92ff1bd MS	141
c92ff1bd MS	142	pgprot_t vm_page_prot; /* Access permissions of this VMA. */
605d9288	143	unsigned long vm_flags; /* Flags, see mm.h. */
c92ff1bd MS	144
	145	struct rb_node vm_rb;
	146
	147	/*
	148	* For areas with an address space and backing store,
	149	* linkage into the address_space->i_mmap prio tree, or
	150	* linkage to the list of like vmas hanging off its node, or
	151	* linkage of vma in the address_space->i_mmap_nonlinear list.
	152	*/
	153	union {
	154	struct {
	155	struct list_head list;
	156	void parent; / aligns with prio_tree_node parent */
	157	struct vm_area_struct *head;
	158	} vm_set;
	159
	160	struct raw_prio_tree_node prio_tree_node;
	161	} shared;
	162
	163	/*
	164	* A file's MAP_PRIVATE vma can be in both i_mmap tree and anon_vma
	165	* list, after a COW of one of the file pages. A MAP_SHARED vma
	166	* can only be in the i_mmap tree. An anonymous MAP_PRIVATE, stack
	167	* or brk vma (with NULL file) can only be in an anon_vma list.
	168	*/
5beb4930 RR	169	struct list_head anon_vma_chain; /* Serialized by mmap_sem &
5beb4930 RR	170	* page_table_lock */
c92ff1bd MS	171	struct anon_vma anon_vma; / Serialized by page_table_lock */
	172
	173	/* Function pointers to deal with this struct. */
f0f37e2f	174	const struct vm_operations_struct *vm_ops;
c92ff1bd MS	175
	176	/* Information about our backing store: */
	177	unsigned long vm_pgoff; /* Offset (within vm_file) in PAGE_SIZE
	178	units, not PAGE_CACHE_SIZE */
	179	struct file * vm_file; /* File we map to (can be NULL). */
	180	void * vm_private_data; /* was vm_pte (shared mem) */
c92ff1bd MS	181
c92ff1bd MS	182	#ifndef CONFIG_MMU
8feae131	183	struct vm_region vm_region; / NOMMU mapping region */
c92ff1bd MS	184	#endif
	185	#ifdef CONFIG_NUMA
	186	struct mempolicy vm_policy; / NUMA policy for the VMA */
	187	#endif
	188	};
	189
b564daf8 ON	190	struct core_thread {
	191	struct task_struct *task;
	192	struct core_thread *next;
	193	};
	194
32ecb1f2	195	struct core_state {
c5f1cc8c	196	atomic_t nr_threads;
b564daf8	197	struct core_thread dumper;
32ecb1f2 ON	198	struct completion startup;
	199	};
	200
d559db08 KH	201	enum {
	202	MM_FILEPAGES,
	203	MM_ANONPAGES,
b084d435	204	MM_SWAPENTS,
d559db08 KH	205	NR_MM_COUNTERS
	206	};
	207
53bddb4e	208	#if USE_SPLIT_PTLOCKS && defined(CONFIG_MMU)
34e55232	209	#define SPLIT_RSS_COUNTING
34e55232 KH	210	/* per-thread cached information, */
	211	struct task_rss_stat {
	212	int events; /* for synchronization threshold */
	213	int count[NR_MM_COUNTERS];
	214	};
172703b0 MF	215	#endif /* USE_SPLIT_PTLOCKS */
172703b0 MF	216
d559db08	217	struct mm_rss_stat {
172703b0	218	atomic_long_t count[NR_MM_COUNTERS];
d559db08	219	};
d559db08	220
c92ff1bd MS	221	struct mm_struct {
	222	struct vm_area_struct * mmap; /* list of VMAs */
	223	struct rb_root mm_rb;
	224	struct vm_area_struct * mmap_cache; /* last find_vma result */
efc1a3b1	225	#ifdef CONFIG_MMU
c92ff1bd MS	226	unsigned long (get_unmapped_area) (struct file filp,
	227	unsigned long addr, unsigned long len,
	228	unsigned long pgoff, unsigned long flags);
	229	void (unmap_area) (struct mm_struct mm, unsigned long addr);
efc1a3b1	230	#endif
c92ff1bd MS	231	unsigned long mmap_base; /* base of mmap area */
	232	unsigned long task_size; /* size of task vm space */
	233	unsigned long cached_hole_size; /* if non-zero, the largest hole below free_area_cache */
	234	unsigned long free_area_cache; /* first hole of size cached_hole_size or larger */
	235	pgd_t * pgd;
	236	atomic_t mm_users; /* How many users with user space? */
	237	atomic_t mm_count; /* How many references to "struct mm_struct" (users count as 1) */
	238	int map_count; /* number of VMAs */
481b4bb5	239
c92ff1bd	240	spinlock_t page_table_lock; /* Protects page tables and some counters */
481b4bb5	241	struct rw_semaphore mmap_sem;
c92ff1bd MS	242
	243	struct list_head mmlist; /* List of maybe swapped mm's. These are globally strung
	244	* together off init_mm.mmlist, and are protected
	245	* by mmlist_lock
	246	*/
	247
c92ff1bd MS	248
	249	unsigned long hiwater_rss; /* High-watermark of RSS usage */
	250	unsigned long hiwater_vm; /* High-water virtual memory usage */
	251
	252	unsigned long total_vm, locked_vm, shared_vm, exec_vm;
	253	unsigned long stack_vm, reserved_vm, def_flags, nr_ptes;
	254	unsigned long start_code, end_code, start_data, end_data;
	255	unsigned long start_brk, brk, start_stack;
	256	unsigned long arg_start, arg_end, env_start, env_end;
	257
	258	unsigned long saved_auxv[AT_VECTOR_SIZE]; /* for /proc/PID/auxv */
	259
d559db08 KH	260	/*
	261	* Special counters, in some configurations protected by the
	262	* page_table_lock, in other configurations by being atomic.
	263	*/
	264	struct mm_rss_stat rss_stat;
	265
801460d0 HS	266	struct linux_binfmt *binfmt;
801460d0 HS	267
6345d24d LT	268	cpumask_var_t cpu_vm_mask_var;
6345d24d LT	269
c92ff1bd MS	270	/* Architecture-specific MM context */
	271	mm_context_t context;
	272
	273	/* Swap token stuff */
	274	/*
	275	* Last value of global fault stamp as seen by this process.
	276	* In other words, this value gives an indication of how long
	277	* it has been since this task got the token.
	278	* Look at mm/thrash.c
	279	*/
	280	unsigned int faultstamp;
	281	unsigned int token_priority;
	282	unsigned int last_interval;
	283
481b4bb5 RK	284	/* How many tasks sharing this mm are OOM_DISABLE */
	285	atomic_t oom_disable_count;
	286
c92ff1bd MS	287	unsigned long flags; /* Must use atomic bitops to access the bits */
c92ff1bd MS	288
a94e2d40	289	struct core_state core_state; / coredumping support */
858f0993	290	#ifdef CONFIG_AIO
abf137dd JA	291	spinlock_t ioctx_lock;
abf137dd JA	292	struct hlist_head ioctx_list;
858f0993	293	#endif
cf475ad2	294	#ifdef CONFIG_MM_OWNER
4cd1a8fc KM	295	/*
	296	* "owner" points to a task that is regarded as the canonical
	297	* user/owner of this mm. All of the following must be true in
	298	* order for it to be changed:
	299	*
	300	* current == mm->owner
	301	* current->mm != mm
	302	* new_owner->mm == mm
	303	* new_owner->alloc_lock is held
	304	*/
4d2deb40	305	struct task_struct __rcu *owner;
78fb7466	306	#endif
925d1c40	307
925d1c40 MH	308	/* store ref to file /proc/<pid>/exe symlink points to */
	309	struct file *exe_file;
	310	unsigned long num_exe_file_vmas;
cddb8a5c AA	311	#ifdef CONFIG_MMU_NOTIFIER
cddb8a5c AA	312	struct mmu_notifier_mm *mmu_notifier_mm;
e7a00c45 AA	313	#endif
	314	#ifdef CONFIG_TRANSPARENT_HUGEPAGE
	315	pgtable_t pmd_huge_pte; /* protected by page_table_lock */
cddb8a5c	316	#endif
6345d24d LT	317	#ifdef CONFIG_CPUMASK_OFFSTACK
	318	struct cpumask cpumask_allocation;
	319	#endif
c92ff1bd MS	320	};
c92ff1bd MS	321
6345d24d LT	322	static inline void mm_init_cpumask(struct mm_struct *mm)
	323	{
	324	#ifdef CONFIG_CPUMASK_OFFSTACK
	325	mm->cpu_vm_mask_var = &mm->cpumask_allocation;
	326	#endif
	327	}
	328
45e575ab	329	/* Future-safe accessor for struct mm_struct's cpu_vm_mask. */
de03c72c KM	330	static inline cpumask_t mm_cpumask(struct mm_struct mm)
	331	{
	332	return mm->cpu_vm_mask_var;
	333	}
45e575ab	334
5b99cd0e	335	#endif /* _LINUX_MM_TYPES_H */