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Source at commit cdde9cf73945d547acd3e96f9508c79e84ad0bf1 created 12 years 9 months ago. By Maarten ter Huurne, MMC: JZ4740: Added support for CPU frequency changing | |
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1 | /* Copyright (C) 2009 Red Hat, Inc. |
2 | * |
3 | * See ../COPYING for licensing terms. |
4 | */ |
5 | |
6 | #include <linux/mm.h> |
7 | #include <linux/mmu_context.h> |
8 | #include <linux/export.h> |
9 | #include <linux/sched.h> |
10 | |
11 | #include <asm/mmu_context.h> |
12 | |
13 | /* |
14 | * use_mm |
15 | * Makes the calling kernel thread take on the specified |
16 | * mm context. |
17 | * Called by the retry thread execute retries within the |
18 | * iocb issuer's mm context, so that copy_from/to_user |
19 | * operations work seamlessly for aio. |
20 | * (Note: this routine is intended to be called only |
21 | * from a kernel thread context) |
22 | */ |
23 | void use_mm(struct mm_struct *mm) |
24 | { |
25 | struct mm_struct *active_mm; |
26 | struct task_struct *tsk = current; |
27 | |
28 | task_lock(tsk); |
29 | active_mm = tsk->active_mm; |
30 | if (active_mm != mm) { |
31 | atomic_inc(&mm->mm_count); |
32 | tsk->active_mm = mm; |
33 | } |
34 | tsk->mm = mm; |
35 | switch_mm(active_mm, mm, tsk); |
36 | task_unlock(tsk); |
37 | |
38 | if (active_mm != mm) |
39 | mmdrop(active_mm); |
40 | } |
41 | EXPORT_SYMBOL_GPL(use_mm); |
42 | |
43 | /* |
44 | * unuse_mm |
45 | * Reverses the effect of use_mm, i.e. releases the |
46 | * specified mm context which was earlier taken on |
47 | * by the calling kernel thread |
48 | * (Note: this routine is intended to be called only |
49 | * from a kernel thread context) |
50 | */ |
51 | void unuse_mm(struct mm_struct *mm) |
52 | { |
53 | struct task_struct *tsk = current; |
54 | |
55 | task_lock(tsk); |
56 | sync_mm_rss(mm); |
57 | tsk->mm = NULL; |
58 | /* active_mm is still 'mm' */ |
59 | enter_lazy_tlb(mm, tsk); |
60 | task_unlock(tsk); |
61 | } |
62 | EXPORT_SYMBOL_GPL(unuse_mm); |
63 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
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jz-3.11
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jz-3.6-rc2-pwm
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jz-3.9-rc8
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jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9