[linux-block.git] / include / linux / swapops.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_SWAPOPS_H
#define _LINUX_SWAPOPS_H

#include <linux/radix-tree.h>
#include <linux/bug.h>
#include <linux/mm_types.h>

#ifdef CONFIG_MMU

/*
 * swapcache pages are stored in the swapper_space radix tree.  We want to
 * get good packing density in that tree, so the index should be dense in
 * the low-order bits.
 *
 * We arrange the `type' and `offset' fields so that `type' is at the seven
 * high-order bits of the swp_entry_t and `offset' is right-aligned in the
 * remaining bits.  Although `type' itself needs only five bits, we allow for
 * shmem/tmpfs to shift it all up a further two bits: see swp_to_radix_entry().
 *
 * swp_entry_t's are *never* stored anywhere in their arch-dependent format.
 */
#define SWP_TYPE_SHIFT	(BITS_PER_XA_VALUE - MAX_SWAPFILES_SHIFT)
#define SWP_OFFSET_MASK	((1UL << SWP_TYPE_SHIFT) - 1)

/*
 * Store a type+offset into a swp_entry_t in an arch-independent format
 */
static inline swp_entry_t swp_entry(unsigned long type, pgoff_t offset)
{
	swp_entry_t ret;

	ret.val = (type << SWP_TYPE_SHIFT) | (offset & SWP_OFFSET_MASK);
	return ret;
}

/*
 * Extract the `type' field from a swp_entry_t.  The swp_entry_t is in
 * arch-independent format
 */
static inline unsigned swp_type(swp_entry_t entry)
{
	return (entry.val >> SWP_TYPE_SHIFT);
}

/*
 * Extract the `offset' field from a swp_entry_t.  The swp_entry_t is in
 * arch-independent format
 */
static inline pgoff_t swp_offset(swp_entry_t entry)
{
	return entry.val & SWP_OFFSET_MASK;
}

/* check whether a pte points to a swap entry */
static inline int is_swap_pte(pte_t pte)
{
	return !pte_none(pte) && !pte_present(pte);
}

/*
 * Convert the arch-dependent pte representation of a swp_entry_t into an
 * arch-independent swp_entry_t.
 */
static inline swp_entry_t pte_to_swp_entry(pte_t pte)
{
	swp_entry_t arch_entry;

	if (pte_swp_soft_dirty(pte))
		pte = pte_swp_clear_soft_dirty(pte);
	if (pte_swp_uffd_wp(pte))
		pte = pte_swp_clear_uffd_wp(pte);
	arch_entry = __pte_to_swp_entry(pte);
	return swp_entry(__swp_type(arch_entry), __swp_offset(arch_entry));
}

/*
 * Convert the arch-independent representation of a swp_entry_t into the
 * arch-dependent pte representation.
 */
static inline pte_t swp_entry_to_pte(swp_entry_t entry)
{
	swp_entry_t arch_entry;

	arch_entry = __swp_entry(swp_type(entry), swp_offset(entry));
	return __swp_entry_to_pte(arch_entry);
}

static inline swp_entry_t radix_to_swp_entry(void *arg)
{
	swp_entry_t entry;

	entry.val = xa_to_value(arg);
	return entry;
}

static inline void *swp_to_radix_entry(swp_entry_t entry)
{
	return xa_mk_value(entry.val);
}

#if IS_ENABLED(CONFIG_DEVICE_PRIVATE)
static inline swp_entry_t make_device_private_entry(struct page *page, bool write)
{
	return swp_entry(write ? SWP_DEVICE_WRITE : SWP_DEVICE_READ,
			 page_to_pfn(page));
}

static inline bool is_device_private_entry(swp_entry_t entry)
{
	int type = swp_type(entry);
	return type == SWP_DEVICE_READ || type == SWP_DEVICE_WRITE;
}

static inline void make_device_private_entry_read(swp_entry_t *entry)
{
	*entry = swp_entry(SWP_DEVICE_READ, swp_offset(*entry));
}

static inline bool is_write_device_private_entry(swp_entry_t entry)
{
	return unlikely(swp_type(entry) == SWP_DEVICE_WRITE);
}

static inline unsigned long device_private_entry_to_pfn(swp_entry_t entry)
{
	return swp_offset(entry);
}

static inline struct page *device_private_entry_to_page(swp_entry_t entry)
{
	return pfn_to_page(swp_offset(entry));
}
#else /* CONFIG_DEVICE_PRIVATE */
static inline swp_entry_t make_device_private_entry(struct page *page, bool write)
{
	return swp_entry(0, 0);
}

static inline void make_device_private_entry_read(swp_entry_t *entry)
{
}

static inline bool is_device_private_entry(swp_entry_t entry)
{
	return false;
}

static inline bool is_write_device_private_entry(swp_entry_t entry)
{
	return false;
}

static inline unsigned long device_private_entry_to_pfn(swp_entry_t entry)
{
	return 0;
}

static inline struct page *device_private_entry_to_page(swp_entry_t entry)
{
	return NULL;
}
#endif /* CONFIG_DEVICE_PRIVATE */

#ifdef CONFIG_MIGRATION
static inline swp_entry_t make_migration_entry(struct page *page, int write)
{
	BUG_ON(!PageLocked(compound_head(page)));

	return swp_entry(write ? SWP_MIGRATION_WRITE : SWP_MIGRATION_READ,
			page_to_pfn(page));
}

static inline int is_migration_entry(swp_entry_t entry)
{
	return unlikely(swp_type(entry) == SWP_MIGRATION_READ ||
			swp_type(entry) == SWP_MIGRATION_WRITE);
}

static inline int is_write_migration_entry(swp_entry_t entry)
{
	return unlikely(swp_type(entry) == SWP_MIGRATION_WRITE);
}

static inline unsigned long migration_entry_to_pfn(swp_entry_t entry)
{
	return swp_offset(entry);
}

static inline struct page *migration_entry_to_page(swp_entry_t entry)
{
	struct page *p = pfn_to_page(swp_offset(entry));
	/*
	 * Any use of migration entries may only occur while the
	 * corresponding page is locked
	 */
	BUG_ON(!PageLocked(compound_head(p)));
	return p;
}

static inline void make_migration_entry_read(swp_entry_t *entry)
{
	*entry = swp_entry(SWP_MIGRATION_READ, swp_offset(*entry));
}

extern void __migration_entry_wait(struct mm_struct *mm, pte_t *ptep,
					spinlock_t *ptl);
extern void migration_entry_wait(struct mm_struct *mm, pmd_t *pmd,
					unsigned long address);
extern void migration_entry_wait_huge(struct vm_area_struct *vma,
		struct mm_struct *mm, pte_t *pte);
#else

#define make_migration_entry(page, write) swp_entry(0, 0)
static inline int is_migration_entry(swp_entry_t swp)
{
	return 0;
}

static inline unsigned long migration_entry_to_pfn(swp_entry_t entry)
{
	return 0;
}

static inline struct page *migration_entry_to_page(swp_entry_t entry)
{
	return NULL;
}

static inline void make_migration_entry_read(swp_entry_t *entryp) { }
static inline void __migration_entry_wait(struct mm_struct *mm, pte_t *ptep,
					spinlock_t *ptl) { }
static inline void migration_entry_wait(struct mm_struct *mm, pmd_t *pmd,
					 unsigned long address) { }
static inline void migration_entry_wait_huge(struct vm_area_struct *vma,
		struct mm_struct *mm, pte_t *pte) { }
static inline int is_write_migration_entry(swp_entry_t entry)
{
	return 0;
}

#endif

struct page_vma_mapped_walk;

#ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION
extern void set_pmd_migration_entry(struct page_vma_mapped_walk *pvmw,
		struct page *page);

extern void remove_migration_pmd(struct page_vma_mapped_walk *pvmw,
		struct page *new);

extern void pmd_migration_entry_wait(struct mm_struct *mm, pmd_t *pmd);

static inline swp_entry_t pmd_to_swp_entry(pmd_t pmd)
{
	swp_entry_t arch_entry;

	if (pmd_swp_soft_dirty(pmd))
		pmd = pmd_swp_clear_soft_dirty(pmd);
	arch_entry = __pmd_to_swp_entry(pmd);
	return swp_entry(__swp_type(arch_entry), __swp_offset(arch_entry));
}

static inline pmd_t swp_entry_to_pmd(swp_entry_t entry)
{
	swp_entry_t arch_entry;

	arch_entry = __swp_entry(swp_type(entry), swp_offset(entry));
	return __swp_entry_to_pmd(arch_entry);
}

static inline int is_pmd_migration_entry(pmd_t pmd)
{
	return !pmd_present(pmd) && is_migration_entry(pmd_to_swp_entry(pmd));
}
#else
static inline void set_pmd_migration_entry(struct page_vma_mapped_walk *pvmw,
		struct page *page)
{
	BUILD_BUG();
}

static inline void remove_migration_pmd(struct page_vma_mapped_walk *pvmw,
		struct page *new)
{
	BUILD_BUG();
}

static inline void pmd_migration_entry_wait(struct mm_struct *m, pmd_t *p) { }

static inline swp_entry_t pmd_to_swp_entry(pmd_t pmd)
{
	return swp_entry(0, 0);
}

static inline pmd_t swp_entry_to_pmd(swp_entry_t entry)
{
	return __pmd(0);
}

static inline int is_pmd_migration_entry(pmd_t pmd)
{
	return 0;
}
#endif

#ifdef CONFIG_MEMORY_FAILURE

extern atomic_long_t num_poisoned_pages __read_mostly;

/*
 * Support for hardware poisoned pages
 */
static inline swp_entry_t make_hwpoison_entry(struct page *page)
{
	BUG_ON(!PageLocked(page));
	return swp_entry(SWP_HWPOISON, page_to_pfn(page));
}

static inline int is_hwpoison_entry(swp_entry_t entry)
{
	return swp_type(entry) == SWP_HWPOISON;
}

static inline void num_poisoned_pages_inc(void)
{
	atomic_long_inc(&num_poisoned_pages);
}

static inline void num_poisoned_pages_dec(void)
{
	atomic_long_dec(&num_poisoned_pages);
}

#else

static inline swp_entry_t make_hwpoison_entry(struct page *page)
{
	return swp_entry(0, 0);
}

static inline int is_hwpoison_entry(swp_entry_t swp)
{
	return 0;
}

static inline void num_poisoned_pages_inc(void)
{
}
#endif

#if defined(CONFIG_MEMORY_FAILURE) || defined(CONFIG_MIGRATION) || \
    defined(CONFIG_DEVICE_PRIVATE)
static inline int non_swap_entry(swp_entry_t entry)
{
	return swp_type(entry) >= MAX_SWAPFILES;
}
#else
static inline int non_swap_entry(swp_entry_t entry)
{
	return 0;
}
#endif

#endif /* CONFIG_MMU */
#endif /* _LINUX_SWAPOPS_H */
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
a2c16d6c HD	2	#ifndef _LINUX_SWAPOPS_H
	3	#define _LINUX_SWAPOPS_H
	4
	5	#include <linux/radix-tree.h>
187f1882	6	#include <linux/bug.h>
2b740303	7	#include <linux/mm_types.h>
a2c16d6c	8
9b98fa22 CH	9	#ifdef CONFIG_MMU
9b98fa22 CH	10
1da177e4 LT	11	/*
	12	* swapcache pages are stored in the swapper_space radix tree. We want to
	13	* get good packing density in that tree, so the index should be dense in
	14	* the low-order bits.
	15	*
9b15b817	16	* We arrange the `type' and `offset' fields so that `type' is at the seven
e83a9596	17	* high-order bits of the swp_entry_t and `offset' is right-aligned in the
9b15b817 HD	18	* remaining bits. Although `type' itself needs only five bits, we allow for
9b15b817 HD	19	* shmem/tmpfs to shift it all up a further two bits: see swp_to_radix_entry().
1da177e4 LT	20	*
	21	* swp_entry_t's are never stored anywhere in their arch-dependent format.
	22	*/
3159f943 MW	23	#define SWP_TYPE_SHIFT (BITS_PER_XA_VALUE - MAX_SWAPFILES_SHIFT)
3159f943 MW	24	#define SWP_OFFSET_MASK ((1UL << SWP_TYPE_SHIFT) - 1)
1da177e4 LT	25
	26	/*
	27	* Store a type+offset into a swp_entry_t in an arch-independent format
	28	*/
	29	static inline swp_entry_t swp_entry(unsigned long type, pgoff_t offset)
	30	{
	31	swp_entry_t ret;
	32
3159f943	33	ret.val = (type << SWP_TYPE_SHIFT) \| (offset & SWP_OFFSET_MASK);
1da177e4 LT	34	return ret;
	35	}
	36
	37	/*
	38	* Extract the `type' field from a swp_entry_t. The swp_entry_t is in
	39	* arch-independent format
	40	*/
	41	static inline unsigned swp_type(swp_entry_t entry)
	42	{
3159f943	43	return (entry.val >> SWP_TYPE_SHIFT);
1da177e4 LT	44	}
	45
	46	/*
	47	* Extract the `offset' field from a swp_entry_t. The swp_entry_t is in
	48	* arch-independent format
	49	*/
	50	static inline pgoff_t swp_offset(swp_entry_t entry)
	51	{
3159f943	52	return entry.val & SWP_OFFSET_MASK;
1da177e4 LT	53	}
1da177e4 LT	54
698dd4ba MM	55	/* check whether a pte points to a swap entry */
	56	static inline int is_swap_pte(pte_t pte)
	57	{
21d9ee3e	58	return !pte_none(pte) && !pte_present(pte);
698dd4ba MM	59	}
698dd4ba MM	60
1da177e4 LT	61	/*
	62	* Convert the arch-dependent pte representation of a swp_entry_t into an
	63	* arch-independent swp_entry_t.
	64	*/
	65	static inline swp_entry_t pte_to_swp_entry(pte_t pte)
	66	{
	67	swp_entry_t arch_entry;
	68
179ef71c CG	69	if (pte_swp_soft_dirty(pte))
179ef71c CG	70	pte = pte_swp_clear_soft_dirty(pte);
f45ec5ff PX	71	if (pte_swp_uffd_wp(pte))
f45ec5ff PX	72	pte = pte_swp_clear_uffd_wp(pte);
1da177e4 LT	73	arch_entry = __pte_to_swp_entry(pte);
	74	return swp_entry(__swp_type(arch_entry), __swp_offset(arch_entry));
	75	}
	76
	77	/*
	78	* Convert the arch-independent representation of a swp_entry_t into the
	79	* arch-dependent pte representation.
	80	*/
	81	static inline pte_t swp_entry_to_pte(swp_entry_t entry)
	82	{
	83	swp_entry_t arch_entry;
	84
	85	arch_entry = __swp_entry(swp_type(entry), swp_offset(entry));
1da177e4 LT	86	return __swp_entry_to_pte(arch_entry);
1da177e4 LT	87	}
0697212a	88
a2c16d6c HD	89	static inline swp_entry_t radix_to_swp_entry(void *arg)
	90	{
	91	swp_entry_t entry;
	92
3159f943	93	entry.val = xa_to_value(arg);
a2c16d6c HD	94	return entry;
	95	}
	96
	97	static inline void *swp_to_radix_entry(swp_entry_t entry)
	98	{
3159f943	99	return xa_mk_value(entry.val);
a2c16d6c HD	100	}
a2c16d6c HD	101
5042db43 JG	102	#if IS_ENABLED(CONFIG_DEVICE_PRIVATE)
	103	static inline swp_entry_t make_device_private_entry(struct page *page, bool write)
	104	{
	105	return swp_entry(write ? SWP_DEVICE_WRITE : SWP_DEVICE_READ,
	106	page_to_pfn(page));
	107	}
	108
	109	static inline bool is_device_private_entry(swp_entry_t entry)
	110	{
	111	int type = swp_type(entry);
	112	return type == SWP_DEVICE_READ \|\| type == SWP_DEVICE_WRITE;
	113	}
	114
	115	static inline void make_device_private_entry_read(swp_entry_t *entry)
	116	{
	117	entry = swp_entry(SWP_DEVICE_READ, swp_offset(entry));
	118	}
	119
	120	static inline bool is_write_device_private_entry(swp_entry_t entry)
	121	{
	122	return unlikely(swp_type(entry) == SWP_DEVICE_WRITE);
	123	}
	124
0d665e7b KS	125	static inline unsigned long device_private_entry_to_pfn(swp_entry_t entry)
	126	{
	127	return swp_offset(entry);
	128	}
	129
5042db43 JG	130	static inline struct page *device_private_entry_to_page(swp_entry_t entry)
	131	{
	132	return pfn_to_page(swp_offset(entry));
	133	}
5042db43 JG	134	#else /* CONFIG_DEVICE_PRIVATE */
	135	static inline swp_entry_t make_device_private_entry(struct page *page, bool write)
	136	{
	137	return swp_entry(0, 0);
	138	}
	139
	140	static inline void make_device_private_entry_read(swp_entry_t *entry)
	141	{
	142	}
	143
	144	static inline bool is_device_private_entry(swp_entry_t entry)
	145	{
	146	return false;
	147	}
	148
	149	static inline bool is_write_device_private_entry(swp_entry_t entry)
	150	{
	151	return false;
	152	}
	153
0d665e7b KS	154	static inline unsigned long device_private_entry_to_pfn(swp_entry_t entry)
	155	{
	156	return 0;
	157	}
	158
5042db43 JG	159	static inline struct page *device_private_entry_to_page(swp_entry_t entry)
	160	{
	161	return NULL;
	162	}
5042db43 JG	163	#endif /* CONFIG_DEVICE_PRIVATE */
5042db43 JG	164
0697212a CL	165	#ifdef CONFIG_MIGRATION
	166	static inline swp_entry_t make_migration_entry(struct page *page, int write)
	167	{
616b8371 ZY	168	BUG_ON(!PageLocked(compound_head(page)));
616b8371 ZY	169
0697212a CL	170	return swp_entry(write ? SWP_MIGRATION_WRITE : SWP_MIGRATION_READ,
	171	page_to_pfn(page));
	172	}
	173
	174	static inline int is_migration_entry(swp_entry_t entry)
	175	{
	176	return unlikely(swp_type(entry) == SWP_MIGRATION_READ \|\|
	177	swp_type(entry) == SWP_MIGRATION_WRITE);
	178	}
	179
	180	static inline int is_write_migration_entry(swp_entry_t entry)
	181	{
	182	return unlikely(swp_type(entry) == SWP_MIGRATION_WRITE);
	183	}
	184
0d665e7b KS	185	static inline unsigned long migration_entry_to_pfn(swp_entry_t entry)
	186	{
	187	return swp_offset(entry);
	188	}
	189
0697212a CL	190	static inline struct page *migration_entry_to_page(swp_entry_t entry)
	191	{
	192	struct page *p = pfn_to_page(swp_offset(entry));
	193	/*
	194	* Any use of migration entries may only occur while the
	195	* corresponding page is locked
	196	*/
616b8371	197	BUG_ON(!PageLocked(compound_head(p)));
0697212a CL	198	return p;
	199	}
	200
	201	static inline void make_migration_entry_read(swp_entry_t *entry)
	202	{
	203	entry = swp_entry(SWP_MIGRATION_READ, swp_offset(entry));
	204	}
	205
e66f17ff NH	206	extern void __migration_entry_wait(struct mm_struct mm, pte_t ptep,
e66f17ff NH	207	spinlock_t *ptl);
0697212a CL	208	extern void migration_entry_wait(struct mm_struct mm, pmd_t pmd,
0697212a CL	209	unsigned long address);
cb900f41 KS	210	extern void migration_entry_wait_huge(struct vm_area_struct *vma,
cb900f41 KS	211	struct mm_struct mm, pte_t pte);
0697212a CL	212	#else
	213
	214	#define make_migration_entry(page, write) swp_entry(0, 0)
5ec553a9 AM	215	static inline int is_migration_entry(swp_entry_t swp)
	216	{
	217	return 0;
	218	}
0d665e7b KS	219
	220	static inline unsigned long migration_entry_to_pfn(swp_entry_t entry)
	221	{
	222	return 0;
	223	}
	224
616b8371 ZY	225	static inline struct page *migration_entry_to_page(swp_entry_t entry)
	226	{
	227	return NULL;
	228	}
	229
0697212a	230	static inline void make_migration_entry_read(swp_entry_t *entryp) { }
e66f17ff NH	231	static inline void __migration_entry_wait(struct mm_struct mm, pte_t ptep,
e66f17ff NH	232	spinlock_t *ptl) { }
0697212a CL	233	static inline void migration_entry_wait(struct mm_struct mm, pmd_t pmd,
0697212a CL	234	unsigned long address) { }
cb900f41 KS	235	static inline void migration_entry_wait_huge(struct vm_area_struct *vma,
cb900f41 KS	236	struct mm_struct mm, pte_t pte) { }
0697212a CL	237	static inline int is_write_migration_entry(swp_entry_t entry)
	238	{
	239	return 0;
	240	}
	241
	242	#endif
	243
616b8371 ZY	244	struct page_vma_mapped_walk;
	245
	246	#ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION
	247	extern void set_pmd_migration_entry(struct page_vma_mapped_walk *pvmw,
	248	struct page *page);
	249
	250	extern void remove_migration_pmd(struct page_vma_mapped_walk *pvmw,
	251	struct page *new);
	252
	253	extern void pmd_migration_entry_wait(struct mm_struct mm, pmd_t pmd);
	254
	255	static inline swp_entry_t pmd_to_swp_entry(pmd_t pmd)
	256	{
	257	swp_entry_t arch_entry;
	258
ab6e3d09 NH	259	if (pmd_swp_soft_dirty(pmd))
ab6e3d09 NH	260	pmd = pmd_swp_clear_soft_dirty(pmd);
616b8371 ZY	261	arch_entry = __pmd_to_swp_entry(pmd);
	262	return swp_entry(__swp_type(arch_entry), __swp_offset(arch_entry));
	263	}
	264
	265	static inline pmd_t swp_entry_to_pmd(swp_entry_t entry)
	266	{
	267	swp_entry_t arch_entry;
	268
	269	arch_entry = __swp_entry(swp_type(entry), swp_offset(entry));
	270	return __swp_entry_to_pmd(arch_entry);
	271	}
	272
	273	static inline int is_pmd_migration_entry(pmd_t pmd)
	274	{
	275	return !pmd_present(pmd) && is_migration_entry(pmd_to_swp_entry(pmd));
	276	}
	277	#else
	278	static inline void set_pmd_migration_entry(struct page_vma_mapped_walk *pvmw,
	279	struct page *page)
	280	{
	281	BUILD_BUG();
	282	}
	283
	284	static inline void remove_migration_pmd(struct page_vma_mapped_walk *pvmw,
	285	struct page *new)
	286	{
	287	BUILD_BUG();
	288	}
	289
	290	static inline void pmd_migration_entry_wait(struct mm_struct m, pmd_t p) { }
	291
	292	static inline swp_entry_t pmd_to_swp_entry(pmd_t pmd)
	293	{
	294	return swp_entry(0, 0);
	295	}
	296
	297	static inline pmd_t swp_entry_to_pmd(swp_entry_t entry)
	298	{
	299	return __pmd(0);
	300	}
	301
	302	static inline int is_pmd_migration_entry(pmd_t pmd)
	303	{
	304	return 0;
	305	}
	306	#endif
	307
a7420aa5	308	#ifdef CONFIG_MEMORY_FAILURE
8e30456b NH	309
	310	extern atomic_long_t num_poisoned_pages __read_mostly;
	311
a7420aa5 AK	312	/*
	313	* Support for hardware poisoned pages
	314	*/
	315	static inline swp_entry_t make_hwpoison_entry(struct page *page)
	316	{
	317	BUG_ON(!PageLocked(page));
	318	return swp_entry(SWP_HWPOISON, page_to_pfn(page));
	319	}
	320
	321	static inline int is_hwpoison_entry(swp_entry_t entry)
	322	{
	323	return swp_type(entry) == SWP_HWPOISON;
	324	}
8e30456b NH	325
	326	static inline void num_poisoned_pages_inc(void)
	327	{
	328	atomic_long_inc(&num_poisoned_pages);
	329	}
	330
	331	static inline void num_poisoned_pages_dec(void)
	332	{
	333	atomic_long_dec(&num_poisoned_pages);
	334	}
	335
a7420aa5 AK	336	#else
	337
	338	static inline swp_entry_t make_hwpoison_entry(struct page *page)
	339	{
	340	return swp_entry(0, 0);
	341	}
	342
	343	static inline int is_hwpoison_entry(swp_entry_t swp)
	344	{
	345	return 0;
	346	}
da1b13cc	347
da1b13cc WL	348	static inline void num_poisoned_pages_inc(void)
	349	{
	350	}
a7420aa5 AK	351	#endif
a7420aa5 AK	352
3f3673d7 SP	353	#if defined(CONFIG_MEMORY_FAILURE) \|\| defined(CONFIG_MIGRATION) \|\| \
3f3673d7 SP	354	defined(CONFIG_DEVICE_PRIVATE)
a7420aa5 AK	355	static inline int non_swap_entry(swp_entry_t entry)
	356	{
	357	return swp_type(entry) >= MAX_SWAPFILES;
	358	}
	359	#else
	360	static inline int non_swap_entry(swp_entry_t entry)
	361	{
	362	return 0;
	363	}
	364	#endif
a2c16d6c	365
9b98fa22	366	#endif /* CONFIG_MMU */
a2c16d6c	367	#endif /* _LINUX_SWAPOPS_H */