diff options
Diffstat (limited to 'include/asm-i386/semaphore.h')
-rw-r--r-- | include/asm-i386/semaphore.h | 49 |
1 files changed, 17 insertions, 32 deletions
diff --git a/include/asm-i386/semaphore.h b/include/asm-i386/semaphore.h index d51e800acf29..e63b6a68f04c 100644 --- a/include/asm-i386/semaphore.h +++ b/include/asm-i386/semaphore.h | |||
@@ -100,13 +100,10 @@ static inline void down(struct semaphore * sem) | |||
100 | __asm__ __volatile__( | 100 | __asm__ __volatile__( |
101 | "# atomic down operation\n\t" | 101 | "# atomic down operation\n\t" |
102 | LOCK_PREFIX "decl %0\n\t" /* --sem->count */ | 102 | LOCK_PREFIX "decl %0\n\t" /* --sem->count */ |
103 | "js 2f\n" | 103 | "jns 2f\n" |
104 | "1:\n" | 104 | "\tlea %0,%%eax\n\t" |
105 | LOCK_SECTION_START("") | 105 | "call __down_failed\n" |
106 | "2:\tlea %0,%%eax\n\t" | 106 | "2:" |
107 | "call __down_failed\n\t" | ||
108 | "jmp 1b\n" | ||
109 | LOCK_SECTION_END | ||
110 | :"+m" (sem->count) | 107 | :"+m" (sem->count) |
111 | : | 108 | : |
112 | :"memory","ax"); | 109 | :"memory","ax"); |
@@ -123,15 +120,12 @@ static inline int down_interruptible(struct semaphore * sem) | |||
123 | might_sleep(); | 120 | might_sleep(); |
124 | __asm__ __volatile__( | 121 | __asm__ __volatile__( |
125 | "# atomic interruptible down operation\n\t" | 122 | "# atomic interruptible down operation\n\t" |
123 | "xorl %0,%0\n\t" | ||
126 | LOCK_PREFIX "decl %1\n\t" /* --sem->count */ | 124 | LOCK_PREFIX "decl %1\n\t" /* --sem->count */ |
127 | "js 2f\n\t" | 125 | "jns 2f\n\t" |
128 | "xorl %0,%0\n" | 126 | "lea %1,%%eax\n\t" |
129 | "1:\n" | 127 | "call __down_failed_interruptible\n" |
130 | LOCK_SECTION_START("") | 128 | "2:" |
131 | "2:\tlea %1,%%eax\n\t" | ||
132 | "call __down_failed_interruptible\n\t" | ||
133 | "jmp 1b\n" | ||
134 | LOCK_SECTION_END | ||
135 | :"=a" (result), "+m" (sem->count) | 129 | :"=a" (result), "+m" (sem->count) |
136 | : | 130 | : |
137 | :"memory"); | 131 | :"memory"); |
@@ -148,15 +142,12 @@ static inline int down_trylock(struct semaphore * sem) | |||
148 | 142 | ||
149 | __asm__ __volatile__( | 143 | __asm__ __volatile__( |
150 | "# atomic interruptible down operation\n\t" | 144 | "# atomic interruptible down operation\n\t" |
145 | "xorl %0,%0\n\t" | ||
151 | LOCK_PREFIX "decl %1\n\t" /* --sem->count */ | 146 | LOCK_PREFIX "decl %1\n\t" /* --sem->count */ |
152 | "js 2f\n\t" | 147 | "jns 2f\n\t" |
153 | "xorl %0,%0\n" | 148 | "lea %1,%%eax\n\t" |
154 | "1:\n" | ||
155 | LOCK_SECTION_START("") | ||
156 | "2:\tlea %1,%%eax\n\t" | ||
157 | "call __down_failed_trylock\n\t" | 149 | "call __down_failed_trylock\n\t" |
158 | "jmp 1b\n" | 150 | "2:\n" |
159 | LOCK_SECTION_END | ||
160 | :"=a" (result), "+m" (sem->count) | 151 | :"=a" (result), "+m" (sem->count) |
161 | : | 152 | : |
162 | :"memory"); | 153 | :"memory"); |
@@ -166,22 +157,16 @@ static inline int down_trylock(struct semaphore * sem) | |||
166 | /* | 157 | /* |
167 | * Note! This is subtle. We jump to wake people up only if | 158 | * Note! This is subtle. We jump to wake people up only if |
168 | * the semaphore was negative (== somebody was waiting on it). | 159 | * the semaphore was negative (== somebody was waiting on it). |
169 | * The default case (no contention) will result in NO | ||
170 | * jumps for both down() and up(). | ||
171 | */ | 160 | */ |
172 | static inline void up(struct semaphore * sem) | 161 | static inline void up(struct semaphore * sem) |
173 | { | 162 | { |
174 | __asm__ __volatile__( | 163 | __asm__ __volatile__( |
175 | "# atomic up operation\n\t" | 164 | "# atomic up operation\n\t" |
176 | LOCK_PREFIX "incl %0\n\t" /* ++sem->count */ | 165 | LOCK_PREFIX "incl %0\n\t" /* ++sem->count */ |
177 | "jle 2f\n" | 166 | "jg 1f\n\t" |
178 | "1:\n" | 167 | "lea %0,%%eax\n\t" |
179 | LOCK_SECTION_START("") | 168 | "call __up_wakeup\n" |
180 | "2:\tlea %0,%%eax\n\t" | 169 | "1:" |
181 | "call __up_wakeup\n\t" | ||
182 | "jmp 1b\n" | ||
183 | LOCK_SECTION_END | ||
184 | ".subsection 0\n" | ||
185 | :"+m" (sem->count) | 170 | :"+m" (sem->count) |
186 | : | 171 | : |
187 | :"memory","ax"); | 172 | :"memory","ax"); |