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-rw-r--r--arch/h8300/kernel/Makefile2
-rw-r--r--arch/h8300/kernel/h8300_ksyms.c1
-rw-r--r--arch/h8300/kernel/semaphore.c132
3 files changed, 1 insertions, 134 deletions
diff --git a/arch/h8300/kernel/Makefile b/arch/h8300/kernel/Makefile
index 874f6aefee65..6c248c3c5c3b 100644
--- a/arch/h8300/kernel/Makefile
+++ b/arch/h8300/kernel/Makefile
@@ -5,7 +5,7 @@
5extra-y := vmlinux.lds 5extra-y := vmlinux.lds
6 6
7obj-y := process.o traps.o ptrace.o irq.o \ 7obj-y := process.o traps.o ptrace.o irq.o \
8 sys_h8300.o time.o semaphore.o signal.o \ 8 sys_h8300.o time.o signal.o \
9 setup.o gpio.o init_task.o syscalls.o \ 9 setup.o gpio.o init_task.o syscalls.o \
10 entry.o 10 entry.o
11 11
diff --git a/arch/h8300/kernel/h8300_ksyms.c b/arch/h8300/kernel/h8300_ksyms.c
index d1b15267ac81..6866bd9c7fb4 100644
--- a/arch/h8300/kernel/h8300_ksyms.c
+++ b/arch/h8300/kernel/h8300_ksyms.c
@@ -12,7 +12,6 @@
12#include <asm/pgalloc.h> 12#include <asm/pgalloc.h>
13#include <asm/irq.h> 13#include <asm/irq.h>
14#include <asm/io.h> 14#include <asm/io.h>
15#include <asm/semaphore.h>
16#include <asm/checksum.h> 15#include <asm/checksum.h>
17#include <asm/current.h> 16#include <asm/current.h>
18#include <asm/gpio.h> 17#include <asm/gpio.h>
diff --git a/arch/h8300/kernel/semaphore.c b/arch/h8300/kernel/semaphore.c
deleted file mode 100644
index d12cbbfe6ebd..000000000000
--- a/arch/h8300/kernel/semaphore.c
+++ /dev/null
@@ -1,132 +0,0 @@
1/*
2 * Generic semaphore code. Buyer beware. Do your own
3 * specific changes in <asm/semaphore-helper.h>
4 */
5
6#include <linux/sched.h>
7#include <linux/init.h>
8#include <asm/semaphore-helper.h>
9
10#ifndef CONFIG_RMW_INSNS
11spinlock_t semaphore_wake_lock;
12#endif
13
14/*
15 * Semaphores are implemented using a two-way counter:
16 * The "count" variable is decremented for each process
17 * that tries to sleep, while the "waking" variable is
18 * incremented when the "up()" code goes to wake up waiting
19 * processes.
20 *
21 * Notably, the inline "up()" and "down()" functions can
22 * efficiently test if they need to do any extra work (up
23 * needs to do something only if count was negative before
24 * the increment operation.
25 *
26 * waking_non_zero() (from asm/semaphore.h) must execute
27 * atomically.
28 *
29 * When __up() is called, the count was negative before
30 * incrementing it, and we need to wake up somebody.
31 *
32 * This routine adds one to the count of processes that need to
33 * wake up and exit. ALL waiting processes actually wake up but
34 * only the one that gets to the "waking" field first will gate
35 * through and acquire the semaphore. The others will go back
36 * to sleep.
37 *
38 * Note that these functions are only called when there is
39 * contention on the lock, and as such all this is the
40 * "non-critical" part of the whole semaphore business. The
41 * critical part is the inline stuff in <asm/semaphore.h>
42 * where we want to avoid any extra jumps and calls.
43 */
44void __up(struct semaphore *sem)
45{
46 wake_one_more(sem);
47 wake_up(&sem->wait);
48}
49
50/*
51 * Perform the "down" function. Return zero for semaphore acquired,
52 * return negative for signalled out of the function.
53 *
54 * If called from __down, the return is ignored and the wait loop is
55 * not interruptible. This means that a task waiting on a semaphore
56 * using "down()" cannot be killed until someone does an "up()" on
57 * the semaphore.
58 *
59 * If called from __down_interruptible, the return value gets checked
60 * upon return. If the return value is negative then the task continues
61 * with the negative value in the return register (it can be tested by
62 * the caller).
63 *
64 * Either form may be used in conjunction with "up()".
65 *
66 */
67
68
69#define DOWN_HEAD(task_state) \
70 \
71 \
72 current->state = (task_state); \
73 add_wait_queue(&sem->wait, &wait); \
74 \
75 /* \
76 * Ok, we're set up. sem->count is known to be less than zero \
77 * so we must wait. \
78 * \
79 * We can let go the lock for purposes of waiting. \
80 * We re-acquire it after awaking so as to protect \
81 * all semaphore operations. \
82 * \
83 * If "up()" is called before we call waking_non_zero() then \
84 * we will catch it right away. If it is called later then \
85 * we will have to go through a wakeup cycle to catch it. \
86 * \
87 * Multiple waiters contend for the semaphore lock to see \
88 * who gets to gate through and who has to wait some more. \
89 */ \
90 for (;;) {
91
92#define DOWN_TAIL(task_state) \
93 current->state = (task_state); \
94 } \
95 current->state = TASK_RUNNING; \
96 remove_wait_queue(&sem->wait, &wait);
97
98void __sched __down(struct semaphore * sem)
99{
100 DECLARE_WAITQUEUE(wait, current);
101
102 DOWN_HEAD(TASK_UNINTERRUPTIBLE)
103 if (waking_non_zero(sem))
104 break;
105 schedule();
106 DOWN_TAIL(TASK_UNINTERRUPTIBLE)
107}
108
109int __sched __down_interruptible(struct semaphore * sem)
110{
111 DECLARE_WAITQUEUE(wait, current);
112 int ret = 0;
113
114 DOWN_HEAD(TASK_INTERRUPTIBLE)
115
116 ret = waking_non_zero_interruptible(sem, current);
117 if (ret)
118 {
119 if (ret == 1)
120 /* ret != 0 only if we get interrupted -arca */
121 ret = 0;
122 break;
123 }
124 schedule();
125 DOWN_TAIL(TASK_INTERRUPTIBLE)
126 return ret;
127}
128
129int __down_trylock(struct semaphore * sem)
130{
131 return waking_non_zero_trylock(sem);
132}
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