1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _LINUX_MM_TYPES_TASK_H 3 #define _LINUX_MM_TYPES_TASK_H 4 5 /* 6 * Here are the definitions of the MM data types that are embedded in 'struct task_struct'. 7 * 8 * (These are defined separately to decouple sched.h from mm_types.h as much as possible.) 9 */ 10 11 #include <linux/types.h> 12 #include <linux/threads.h> 13 #include <linux/atomic.h> 14 #include <linux/cpumask.h> 15 16 #include <asm/page.h> 17 18 #ifdef CONFIG_ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH 19 #include <asm/tlbbatch.h> 20 #endif 21 22 #define USE_SPLIT_PTE_PTLOCKS (NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS) 23 #define USE_SPLIT_PMD_PTLOCKS (USE_SPLIT_PTE_PTLOCKS && \ 24 IS_ENABLED(CONFIG_ARCH_ENABLE_SPLIT_PMD_PTLOCK)) 25 #define ALLOC_SPLIT_PTLOCKS (SPINLOCK_SIZE > BITS_PER_LONG/8) 26 27 /* 28 * When updating this, please also update struct resident_page_types[] in 29 * kernel/fork.c 30 */ 31 enum { 32 MM_FILEPAGES, /* Resident file mapping pages */ 33 MM_ANONPAGES, /* Resident anonymous pages */ 34 MM_SWAPENTS, /* Anonymous swap entries */ 35 MM_SHMEMPAGES, /* Resident shared memory pages */ 36 NR_MM_COUNTERS 37 }; 38 39 struct page_frag { 40 struct page *page; 41 #if (BITS_PER_LONG > 32) || (PAGE_SIZE >= 65536) 42 __u32 offset; 43 __u32 size; 44 #else 45 __u16 offset; 46 __u16 size; 47 #endif 48 }; 49 50 /* Track pages that require TLB flushes */ 51 struct tlbflush_unmap_batch { 52 #ifdef CONFIG_ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH 53 /* 54 * The arch code makes the following promise: generic code can modify a 55 * PTE, then call arch_tlbbatch_add_pending() (which internally provides 56 * all needed barriers), then call arch_tlbbatch_flush(), and the entries 57 * will be flushed on all CPUs by the time that arch_tlbbatch_flush() 58 * returns. 59 */ 60 struct arch_tlbflush_unmap_batch arch; 61 62 /* True if a flush is needed. */ 63 bool flush_required; 64 65 /* 66 * If true then the PTE was dirty when unmapped. The entry must be 67 * flushed before IO is initiated or a stale TLB entry potentially 68 * allows an update without redirtying the page. 69 */ 70 bool writable; 71 #endif 72 }; 73 74 #endif /* _LINUX_MM_TYPES_TASK_H */ 75