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 */
31enum {
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
39struct 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 */
51struct 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

source code of linux/include/linux/mm_types_task.h