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639 lines
16 KiB
639 lines
16 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _LINUX_SWAPOPS_H |
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#define _LINUX_SWAPOPS_H |
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#include <linux/radix-tree.h> |
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#include <linux/bug.h> |
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#include <linux/mm_types.h> |
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#ifdef CONFIG_MMU |
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#ifdef CONFIG_SWAP |
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#include <linux/swapfile.h> |
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#endif /* CONFIG_SWAP */ |
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/* |
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* swapcache pages are stored in the swapper_space radix tree. We want to |
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* get good packing density in that tree, so the index should be dense in |
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* the low-order bits. |
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* |
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* We arrange the `type' and `offset' fields so that `type' is at the six |
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* high-order bits of the swp_entry_t and `offset' is right-aligned in the |
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* remaining bits. Although `type' itself needs only five bits, we allow for |
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* shmem/tmpfs to shift it all up a further one bit: see swp_to_radix_entry(). |
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* |
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* swp_entry_t's are *never* stored anywhere in their arch-dependent format. |
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*/ |
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#define SWP_TYPE_SHIFT (BITS_PER_XA_VALUE - MAX_SWAPFILES_SHIFT) |
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#define SWP_OFFSET_MASK ((1UL << SWP_TYPE_SHIFT) - 1) |
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/* |
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* Definitions only for PFN swap entries (see is_pfn_swap_entry()). To |
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* store PFN, we only need SWP_PFN_BITS bits. Each of the pfn swap entries |
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* can use the extra bits to store other information besides PFN. |
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*/ |
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#ifdef MAX_PHYSMEM_BITS |
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#define SWP_PFN_BITS (MAX_PHYSMEM_BITS - PAGE_SHIFT) |
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#else /* MAX_PHYSMEM_BITS */ |
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#define SWP_PFN_BITS min_t(int, \ |
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sizeof(phys_addr_t) * 8 - PAGE_SHIFT, \ |
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SWP_TYPE_SHIFT) |
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#endif /* MAX_PHYSMEM_BITS */ |
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#define SWP_PFN_MASK (BIT(SWP_PFN_BITS) - 1) |
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/** |
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* Migration swap entry specific bitfield definitions. Layout: |
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* |
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* |----------+--------------------| |
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* | swp_type | swp_offset | |
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* |----------+--------+-+-+-------| |
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* | | resv |D|A| PFN | |
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* |----------+--------+-+-+-------| |
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* |
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* @SWP_MIG_YOUNG_BIT: Whether the page used to have young bit set (bit A) |
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* @SWP_MIG_DIRTY_BIT: Whether the page used to have dirty bit set (bit D) |
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* |
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* Note: A/D bits will be stored in migration entries iff there're enough |
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* free bits in arch specific swp offset. By default we'll ignore A/D bits |
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* when migrating a page. Please refer to migration_entry_supports_ad() |
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* for more information. If there're more bits besides PFN and A/D bits, |
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* they should be reserved and always be zeros. |
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*/ |
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#define SWP_MIG_YOUNG_BIT (SWP_PFN_BITS) |
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#define SWP_MIG_DIRTY_BIT (SWP_PFN_BITS + 1) |
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#define SWP_MIG_TOTAL_BITS (SWP_PFN_BITS + 2) |
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#define SWP_MIG_YOUNG BIT(SWP_MIG_YOUNG_BIT) |
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#define SWP_MIG_DIRTY BIT(SWP_MIG_DIRTY_BIT) |
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static inline bool is_pfn_swap_entry(swp_entry_t entry); |
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|
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/* Clear all flags but only keep swp_entry_t related information */ |
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static inline pte_t pte_swp_clear_flags(pte_t pte) |
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{ |
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if (pte_swp_exclusive(pte)) |
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pte = pte_swp_clear_exclusive(pte); |
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if (pte_swp_soft_dirty(pte)) |
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pte = pte_swp_clear_soft_dirty(pte); |
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if (pte_swp_uffd_wp(pte)) |
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pte = pte_swp_clear_uffd_wp(pte); |
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return pte; |
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} |
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/* |
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* Store a type+offset into a swp_entry_t in an arch-independent format |
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*/ |
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static inline swp_entry_t swp_entry(unsigned long type, pgoff_t offset) |
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{ |
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swp_entry_t ret; |
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ret.val = (type << SWP_TYPE_SHIFT) | (offset & SWP_OFFSET_MASK); |
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return ret; |
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} |
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/* |
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* Extract the `type' field from a swp_entry_t. The swp_entry_t is in |
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* arch-independent format |
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*/ |
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static inline unsigned swp_type(swp_entry_t entry) |
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{ |
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return (entry.val >> SWP_TYPE_SHIFT); |
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} |
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/* |
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* Extract the `offset' field from a swp_entry_t. The swp_entry_t is in |
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* arch-independent format |
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*/ |
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static inline pgoff_t swp_offset(swp_entry_t entry) |
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{ |
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return entry.val & SWP_OFFSET_MASK; |
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} |
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/* |
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* This should only be called upon a pfn swap entry to get the PFN stored |
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* in the swap entry. Please refers to is_pfn_swap_entry() for definition |
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* of pfn swap entry. |
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*/ |
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static inline unsigned long swp_offset_pfn(swp_entry_t entry) |
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{ |
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VM_BUG_ON(!is_pfn_swap_entry(entry)); |
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return swp_offset(entry) & SWP_PFN_MASK; |
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} |
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/* check whether a pte points to a swap entry */ |
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static inline int is_swap_pte(pte_t pte) |
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{ |
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return !pte_none(pte) && !pte_present(pte); |
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} |
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/* |
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* Convert the arch-dependent pte representation of a swp_entry_t into an |
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* arch-independent swp_entry_t. |
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*/ |
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static inline swp_entry_t pte_to_swp_entry(pte_t pte) |
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{ |
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swp_entry_t arch_entry; |
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pte = pte_swp_clear_flags(pte); |
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arch_entry = __pte_to_swp_entry(pte); |
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return swp_entry(__swp_type(arch_entry), __swp_offset(arch_entry)); |
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} |
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/* |
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* Convert the arch-independent representation of a swp_entry_t into the |
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* arch-dependent pte representation. |
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*/ |
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static inline pte_t swp_entry_to_pte(swp_entry_t entry) |
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{ |
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swp_entry_t arch_entry; |
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arch_entry = __swp_entry(swp_type(entry), swp_offset(entry)); |
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return __swp_entry_to_pte(arch_entry); |
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} |
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static inline swp_entry_t radix_to_swp_entry(void *arg) |
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{ |
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swp_entry_t entry; |
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entry.val = xa_to_value(arg); |
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return entry; |
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} |
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static inline void *swp_to_radix_entry(swp_entry_t entry) |
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{ |
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return xa_mk_value(entry.val); |
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} |
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static inline swp_entry_t make_swapin_error_entry(struct page *page) |
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{ |
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return swp_entry(SWP_SWAPIN_ERROR, page_to_pfn(page)); |
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} |
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static inline int is_swapin_error_entry(swp_entry_t entry) |
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{ |
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return swp_type(entry) == SWP_SWAPIN_ERROR; |
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} |
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#if IS_ENABLED(CONFIG_DEVICE_PRIVATE) |
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static inline swp_entry_t make_readable_device_private_entry(pgoff_t offset) |
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{ |
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return swp_entry(SWP_DEVICE_READ, offset); |
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} |
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static inline swp_entry_t make_writable_device_private_entry(pgoff_t offset) |
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{ |
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return swp_entry(SWP_DEVICE_WRITE, offset); |
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} |
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static inline bool is_device_private_entry(swp_entry_t entry) |
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{ |
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int type = swp_type(entry); |
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return type == SWP_DEVICE_READ || type == SWP_DEVICE_WRITE; |
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} |
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static inline bool is_writable_device_private_entry(swp_entry_t entry) |
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{ |
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return unlikely(swp_type(entry) == SWP_DEVICE_WRITE); |
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} |
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static inline swp_entry_t make_readable_device_exclusive_entry(pgoff_t offset) |
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{ |
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return swp_entry(SWP_DEVICE_EXCLUSIVE_READ, offset); |
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} |
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static inline swp_entry_t make_writable_device_exclusive_entry(pgoff_t offset) |
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{ |
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return swp_entry(SWP_DEVICE_EXCLUSIVE_WRITE, offset); |
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} |
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static inline bool is_device_exclusive_entry(swp_entry_t entry) |
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{ |
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return swp_type(entry) == SWP_DEVICE_EXCLUSIVE_READ || |
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swp_type(entry) == SWP_DEVICE_EXCLUSIVE_WRITE; |
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} |
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static inline bool is_writable_device_exclusive_entry(swp_entry_t entry) |
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{ |
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return unlikely(swp_type(entry) == SWP_DEVICE_EXCLUSIVE_WRITE); |
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} |
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#else /* CONFIG_DEVICE_PRIVATE */ |
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static inline swp_entry_t make_readable_device_private_entry(pgoff_t offset) |
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{ |
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return swp_entry(0, 0); |
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} |
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static inline swp_entry_t make_writable_device_private_entry(pgoff_t offset) |
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{ |
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return swp_entry(0, 0); |
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} |
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static inline bool is_device_private_entry(swp_entry_t entry) |
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{ |
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return false; |
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} |
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static inline bool is_writable_device_private_entry(swp_entry_t entry) |
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{ |
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return false; |
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} |
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static inline swp_entry_t make_readable_device_exclusive_entry(pgoff_t offset) |
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{ |
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return swp_entry(0, 0); |
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} |
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static inline swp_entry_t make_writable_device_exclusive_entry(pgoff_t offset) |
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{ |
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return swp_entry(0, 0); |
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} |
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static inline bool is_device_exclusive_entry(swp_entry_t entry) |
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{ |
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return false; |
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} |
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static inline bool is_writable_device_exclusive_entry(swp_entry_t entry) |
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{ |
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return false; |
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} |
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#endif /* CONFIG_DEVICE_PRIVATE */ |
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#ifdef CONFIG_MIGRATION |
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static inline int is_migration_entry(swp_entry_t entry) |
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{ |
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return unlikely(swp_type(entry) == SWP_MIGRATION_READ || |
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swp_type(entry) == SWP_MIGRATION_READ_EXCLUSIVE || |
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swp_type(entry) == SWP_MIGRATION_WRITE); |
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} |
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static inline int is_writable_migration_entry(swp_entry_t entry) |
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{ |
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return unlikely(swp_type(entry) == SWP_MIGRATION_WRITE); |
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} |
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static inline int is_readable_migration_entry(swp_entry_t entry) |
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{ |
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return unlikely(swp_type(entry) == SWP_MIGRATION_READ); |
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} |
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static inline int is_readable_exclusive_migration_entry(swp_entry_t entry) |
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{ |
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return unlikely(swp_type(entry) == SWP_MIGRATION_READ_EXCLUSIVE); |
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} |
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static inline swp_entry_t make_readable_migration_entry(pgoff_t offset) |
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{ |
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return swp_entry(SWP_MIGRATION_READ, offset); |
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} |
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static inline swp_entry_t make_readable_exclusive_migration_entry(pgoff_t offset) |
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{ |
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return swp_entry(SWP_MIGRATION_READ_EXCLUSIVE, offset); |
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} |
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static inline swp_entry_t make_writable_migration_entry(pgoff_t offset) |
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{ |
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return swp_entry(SWP_MIGRATION_WRITE, offset); |
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} |
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/* |
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* Returns whether the host has large enough swap offset field to support |
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* carrying over pgtable A/D bits for page migrations. The result is |
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* pretty much arch specific. |
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*/ |
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static inline bool migration_entry_supports_ad(void) |
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{ |
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#ifdef CONFIG_SWAP |
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return swap_migration_ad_supported; |
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#else /* CONFIG_SWAP */ |
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return false; |
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#endif /* CONFIG_SWAP */ |
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} |
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static inline swp_entry_t make_migration_entry_young(swp_entry_t entry) |
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{ |
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if (migration_entry_supports_ad()) |
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return swp_entry(swp_type(entry), |
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swp_offset(entry) | SWP_MIG_YOUNG); |
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return entry; |
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} |
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static inline bool is_migration_entry_young(swp_entry_t entry) |
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{ |
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if (migration_entry_supports_ad()) |
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return swp_offset(entry) & SWP_MIG_YOUNG; |
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/* Keep the old behavior of aging page after migration */ |
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return false; |
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} |
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static inline swp_entry_t make_migration_entry_dirty(swp_entry_t entry) |
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{ |
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if (migration_entry_supports_ad()) |
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return swp_entry(swp_type(entry), |
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swp_offset(entry) | SWP_MIG_DIRTY); |
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return entry; |
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} |
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static inline bool is_migration_entry_dirty(swp_entry_t entry) |
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{ |
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if (migration_entry_supports_ad()) |
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return swp_offset(entry) & SWP_MIG_DIRTY; |
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/* Keep the old behavior of clean page after migration */ |
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return false; |
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} |
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extern void __migration_entry_wait(struct mm_struct *mm, pte_t *ptep, |
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spinlock_t *ptl); |
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extern void migration_entry_wait(struct mm_struct *mm, pmd_t *pmd, |
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unsigned long address); |
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#ifdef CONFIG_HUGETLB_PAGE |
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extern void __migration_entry_wait_huge(pte_t *ptep, spinlock_t *ptl); |
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extern void migration_entry_wait_huge(struct vm_area_struct *vma, pte_t *pte); |
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#endif /* CONFIG_HUGETLB_PAGE */ |
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#else /* CONFIG_MIGRATION */ |
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static inline swp_entry_t make_readable_migration_entry(pgoff_t offset) |
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{ |
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return swp_entry(0, 0); |
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} |
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static inline swp_entry_t make_readable_exclusive_migration_entry(pgoff_t offset) |
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{ |
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return swp_entry(0, 0); |
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} |
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static inline swp_entry_t make_writable_migration_entry(pgoff_t offset) |
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{ |
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return swp_entry(0, 0); |
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} |
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static inline int is_migration_entry(swp_entry_t swp) |
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{ |
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return 0; |
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} |
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static inline void __migration_entry_wait(struct mm_struct *mm, pte_t *ptep, |
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spinlock_t *ptl) { } |
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static inline void migration_entry_wait(struct mm_struct *mm, pmd_t *pmd, |
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unsigned long address) { } |
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#ifdef CONFIG_HUGETLB_PAGE |
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static inline void __migration_entry_wait_huge(pte_t *ptep, spinlock_t *ptl) { } |
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static inline void migration_entry_wait_huge(struct vm_area_struct *vma, pte_t *pte) { } |
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#endif /* CONFIG_HUGETLB_PAGE */ |
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static inline int is_writable_migration_entry(swp_entry_t entry) |
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{ |
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return 0; |
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} |
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static inline int is_readable_migration_entry(swp_entry_t entry) |
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{ |
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return 0; |
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} |
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static inline swp_entry_t make_migration_entry_young(swp_entry_t entry) |
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{ |
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return entry; |
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} |
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static inline bool is_migration_entry_young(swp_entry_t entry) |
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{ |
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return false; |
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} |
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static inline swp_entry_t make_migration_entry_dirty(swp_entry_t entry) |
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{ |
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return entry; |
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} |
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static inline bool is_migration_entry_dirty(swp_entry_t entry) |
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{ |
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return false; |
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} |
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#endif /* CONFIG_MIGRATION */ |
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typedef unsigned long pte_marker; |
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#define PTE_MARKER_UFFD_WP BIT(0) |
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#define PTE_MARKER_MASK (PTE_MARKER_UFFD_WP) |
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#ifdef CONFIG_PTE_MARKER |
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static inline swp_entry_t make_pte_marker_entry(pte_marker marker) |
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{ |
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return swp_entry(SWP_PTE_MARKER, marker); |
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} |
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static inline bool is_pte_marker_entry(swp_entry_t entry) |
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{ |
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return swp_type(entry) == SWP_PTE_MARKER; |
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} |
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static inline pte_marker pte_marker_get(swp_entry_t entry) |
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{ |
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return swp_offset(entry) & PTE_MARKER_MASK; |
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} |
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static inline bool is_pte_marker(pte_t pte) |
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{ |
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return is_swap_pte(pte) && is_pte_marker_entry(pte_to_swp_entry(pte)); |
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} |
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#else /* CONFIG_PTE_MARKER */ |
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static inline swp_entry_t make_pte_marker_entry(pte_marker marker) |
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{ |
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/* This should never be called if !CONFIG_PTE_MARKER */ |
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WARN_ON_ONCE(1); |
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return swp_entry(0, 0); |
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} |
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static inline bool is_pte_marker_entry(swp_entry_t entry) |
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{ |
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return false; |
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} |
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static inline pte_marker pte_marker_get(swp_entry_t entry) |
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{ |
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return 0; |
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} |
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static inline bool is_pte_marker(pte_t pte) |
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{ |
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return false; |
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} |
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#endif /* CONFIG_PTE_MARKER */ |
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static inline pte_t make_pte_marker(pte_marker marker) |
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{ |
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return swp_entry_to_pte(make_pte_marker_entry(marker)); |
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} |
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/* |
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* This is a special version to check pte_none() just to cover the case when |
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* the pte is a pte marker. It existed because in many cases the pte marker |
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* should be seen as a none pte; it's just that we have stored some information |
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* onto the none pte so it becomes not-none any more. |
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* |
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* It should be used when the pte is file-backed, ram-based and backing |
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* userspace pages, like shmem. It is not needed upon pgtables that do not |
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* support pte markers at all. For example, it's not needed on anonymous |
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* memory, kernel-only memory (including when the system is during-boot), |
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* non-ram based generic file-system. It's fine to be used even there, but the |
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* extra pte marker check will be pure overhead. |
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* |
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* For systems configured with !CONFIG_PTE_MARKER this will be automatically |
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* optimized to pte_none(). |
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*/ |
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static inline int pte_none_mostly(pte_t pte) |
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{ |
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return pte_none(pte) || is_pte_marker(pte); |
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} |
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static inline struct page *pfn_swap_entry_to_page(swp_entry_t entry) |
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{ |
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struct page *p = pfn_to_page(swp_offset_pfn(entry)); |
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/* |
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* Any use of migration entries may only occur while the |
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* corresponding page is locked |
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*/ |
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BUG_ON(is_migration_entry(entry) && !PageLocked(p)); |
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return p; |
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} |
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/* |
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* A pfn swap entry is a special type of swap entry that always has a pfn stored |
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* in the swap offset. They are used to represent unaddressable device memory |
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* and to restrict access to a page undergoing migration. |
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*/ |
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static inline bool is_pfn_swap_entry(swp_entry_t entry) |
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{ |
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/* Make sure the swp offset can always store the needed fields */ |
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BUILD_BUG_ON(SWP_TYPE_SHIFT < SWP_PFN_BITS); |
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return is_migration_entry(entry) || is_device_private_entry(entry) || |
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is_device_exclusive_entry(entry); |
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} |
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struct page_vma_mapped_walk; |
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#ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION |
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extern int set_pmd_migration_entry(struct page_vma_mapped_walk *pvmw, |
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struct page *page); |
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extern void remove_migration_pmd(struct page_vma_mapped_walk *pvmw, |
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struct page *new); |
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extern void pmd_migration_entry_wait(struct mm_struct *mm, pmd_t *pmd); |
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static inline swp_entry_t pmd_to_swp_entry(pmd_t pmd) |
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{ |
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swp_entry_t arch_entry; |
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if (pmd_swp_soft_dirty(pmd)) |
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pmd = pmd_swp_clear_soft_dirty(pmd); |
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if (pmd_swp_uffd_wp(pmd)) |
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pmd = pmd_swp_clear_uffd_wp(pmd); |
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arch_entry = __pmd_to_swp_entry(pmd); |
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return swp_entry(__swp_type(arch_entry), __swp_offset(arch_entry)); |
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} |
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static inline pmd_t swp_entry_to_pmd(swp_entry_t entry) |
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{ |
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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 is_swap_pmd(pmd) && is_migration_entry(pmd_to_swp_entry(pmd)); |
|
} |
|
#else /* CONFIG_ARCH_ENABLE_THP_MIGRATION */ |
|
static inline int 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 /* CONFIG_ARCH_ENABLE_THP_MIGRATION */ |
|
|
|
#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_sub(long i) |
|
{ |
|
atomic_long_sub(i, &num_poisoned_pages); |
|
} |
|
|
|
#else /* CONFIG_MEMORY_FAILURE */ |
|
|
|
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) |
|
{ |
|
} |
|
|
|
static inline void num_poisoned_pages_sub(long i) |
|
{ |
|
} |
|
#endif /* CONFIG_MEMORY_FAILURE */ |
|
|
|
static inline int non_swap_entry(swp_entry_t entry) |
|
{ |
|
return swp_type(entry) >= MAX_SWAPFILES; |
|
} |
|
|
|
#endif /* CONFIG_MMU */ |
|
#endif /* _LINUX_SWAPOPS_H */
|
|
|