diff options
author | Glenn Elliott <gelliott@cs.unc.edu> | 2012-03-04 19:47:13 -0500 |
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committer | Glenn Elliott <gelliott@cs.unc.edu> | 2012-03-04 19:47:13 -0500 |
commit | c71c03bda1e86c9d5198c5d83f712e695c4f2a1e (patch) | |
tree | ecb166cb3e2b7e2adb3b5e292245fefd23381ac8 /drivers/char/tty_mutex.c | |
parent | ea53c912f8a86a8567697115b6a0d8152beee5c8 (diff) | |
parent | 6a00f206debf8a5c8899055726ad127dbeeed098 (diff) |
Merge branch 'mpi-master' into wip-k-fmlpwip-k-fmlp
Conflicts:
litmus/sched_cedf.c
Diffstat (limited to 'drivers/char/tty_mutex.c')
-rw-r--r-- | drivers/char/tty_mutex.c | 47 |
1 files changed, 0 insertions, 47 deletions
diff --git a/drivers/char/tty_mutex.c b/drivers/char/tty_mutex.c deleted file mode 100644 index 133697540c73..000000000000 --- a/drivers/char/tty_mutex.c +++ /dev/null | |||
@@ -1,47 +0,0 @@ | |||
1 | /* | ||
2 | * drivers/char/tty_lock.c | ||
3 | */ | ||
4 | #include <linux/tty.h> | ||
5 | #include <linux/module.h> | ||
6 | #include <linux/kallsyms.h> | ||
7 | #include <linux/semaphore.h> | ||
8 | #include <linux/sched.h> | ||
9 | |||
10 | /* | ||
11 | * The 'big tty mutex' | ||
12 | * | ||
13 | * This mutex is taken and released by tty_lock() and tty_unlock(), | ||
14 | * replacing the older big kernel lock. | ||
15 | * It can no longer be taken recursively, and does not get | ||
16 | * released implicitly while sleeping. | ||
17 | * | ||
18 | * Don't use in new code. | ||
19 | */ | ||
20 | static DEFINE_MUTEX(big_tty_mutex); | ||
21 | struct task_struct *__big_tty_mutex_owner; | ||
22 | EXPORT_SYMBOL_GPL(__big_tty_mutex_owner); | ||
23 | |||
24 | /* | ||
25 | * Getting the big tty mutex. | ||
26 | */ | ||
27 | void __lockfunc tty_lock(void) | ||
28 | { | ||
29 | struct task_struct *task = current; | ||
30 | |||
31 | WARN_ON(__big_tty_mutex_owner == task); | ||
32 | |||
33 | mutex_lock(&big_tty_mutex); | ||
34 | __big_tty_mutex_owner = task; | ||
35 | } | ||
36 | EXPORT_SYMBOL(tty_lock); | ||
37 | |||
38 | void __lockfunc tty_unlock(void) | ||
39 | { | ||
40 | struct task_struct *task = current; | ||
41 | |||
42 | WARN_ON(__big_tty_mutex_owner != task); | ||
43 | __big_tty_mutex_owner = NULL; | ||
44 | |||
45 | mutex_unlock(&big_tty_mutex); | ||
46 | } | ||
47 | EXPORT_SYMBOL(tty_unlock); | ||