projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 3d2d827f MT |
1 | /* Copyright (C) 2009 Red Hat, Inc. |
| 2 | * | |
| 3 | * See ../COPYING for licensing terms. | |
| 4 | */ | |
| 5 | ||
| 6 | #include <linux/mm.h> | |
| 8efd755a | 7 | #include <linux/sched.h> |
| 6e84f315 | 8 | #include <linux/sched/mm.h> |
| f719ff9b | 9 | #include <linux/sched/task.h> |
| 3d2d827f | 10 | #include <linux/mmu_context.h> |
| b95f1b31 | 11 | #include <linux/export.h> |
| 3d2d827f MT |
12 | |
| 13 | #include <asm/mmu_context.h> | |
| 14 | ||
| 15 | /* | |
| 16 | * use_mm | |
| 17 | * Makes the calling kernel thread take on the specified | |
| 18 | * mm context. | |
| 3d2d827f MT |
19 | * (Note: this routine is intended to be called only |
| 20 | * from a kernel thread context) | |
| 21 | */ | |
| 22 | void use_mm(struct mm_struct *mm) | |
| 23 | { | |
| 24 | struct mm_struct *active_mm; | |
| 25 | struct task_struct *tsk = current; | |
| 26 | ||
| 27 | task_lock(tsk); | |
| 28 | active_mm = tsk->active_mm; | |
| f68e1480 | 29 | if (active_mm != mm) { |
| f1f10076 | 30 | mmgrab(mm); |
| f68e1480 MT |
31 | tsk->active_mm = mm; |
| 32 | } | |
| 3d2d827f | 33 | tsk->mm = mm; |
| 3d2d827f MT |
34 | switch_mm(active_mm, mm, tsk); |
| 35 | task_unlock(tsk); | |
| a53efe5f MS |
36 | #ifdef finish_arch_post_lock_switch |
| 37 | finish_arch_post_lock_switch(); | |
| 38 | #endif | |
| 3d2d827f | 39 | |
| f68e1480 MT |
40 | if (active_mm != mm) |
| 41 | mmdrop(active_mm); | |
| 3d2d827f | 42 | } |
| 5da779c3 | 43 | EXPORT_SYMBOL_GPL(use_mm); |
| 3d2d827f MT |
44 | |
| 45 | /* | |
| 46 | * unuse_mm | |
| 47 | * Reverses the effect of use_mm, i.e. releases the | |
| 48 | * specified mm context which was earlier taken on | |
| 49 | * by the calling kernel thread | |
| 50 | * (Note: this routine is intended to be called only | |
| 51 | * from a kernel thread context) | |
| 52 | */ | |
| 53 | void unuse_mm(struct mm_struct *mm) | |
| 54 | { | |
| 55 | struct task_struct *tsk = current; | |
| 56 | ||
| 57 | task_lock(tsk); | |
| 05af2e10 | 58 | sync_mm_rss(mm); |
| 3d2d827f MT |
59 | tsk->mm = NULL; |
| 60 | /* active_mm is still 'mm' */ | |
| 61 | enter_lazy_tlb(mm, tsk); | |
| 62 | task_unlock(tsk); | |
| 63 | } | |
| 5da779c3 | 64 | EXPORT_SYMBOL_GPL(unuse_mm); |