access_process_vm device memory infrastructure

[pandora-kernel.git] / include / asm-x86 / rwsem.h

diff --git a/include/asm-x86/rwsem.h b/include/asm-x86/rwsem.h
index 520a379..750f2a3 100644 (file)
--- a/include/asm-x86/rwsem.h
+++ b/include/asm-x86/rwsem.h
@@ -56,14 +56,16 @@ extern asmregparm struct rw_semaphore *
 /*
  * the semaphore definition
  */
-struct rw_semaphore {
-       signed long             count;
+
 #define RWSEM_UNLOCKED_VALUE           0x00000000
 #define RWSEM_ACTIVE_BIAS              0x00000001
 #define RWSEM_ACTIVE_MASK              0x0000ffff
 #define RWSEM_WAITING_BIAS             (-0x00010000)
 #define RWSEM_ACTIVE_READ_BIAS         RWSEM_ACTIVE_BIAS
 #define RWSEM_ACTIVE_WRITE_BIAS                (RWSEM_WAITING_BIAS + RWSEM_ACTIVE_BIAS)
+
+struct rw_semaphore {
+       signed long             count;
        spinlock_t              wait_lock;
        struct list_head        wait_list;
 #ifdef CONFIG_DEBUG_LOCK_ALLOC
@@ -78,11 +80,13 @@ struct rw_semaphore {
 #endif
 
 
-#define __RWSEM_INITIALIZER(name) \
-{ RWSEM_UNLOCKED_VALUE, __SPIN_LOCK_UNLOCKED((name).wait_lock), \
-  LIST_HEAD_INIT((name).wait_list) __RWSEM_DEP_MAP_INIT(name) }
+#define __RWSEM_INITIALIZER(name)                              \
+{                                                              \
+       RWSEM_UNLOCKED_VALUE, __SPIN_LOCK_UNLOCKED((name).wait_lock), \
+       LIST_HEAD_INIT((name).wait_list) __RWSEM_DEP_MAP_INIT(name) \
+}
 
-#define DECLARE_RWSEM(name) \
+#define DECLARE_RWSEM(name)                                    \
        struct rw_semaphore name = __RWSEM_INITIALIZER(name)
 
 extern void __init_rwsem(struct rw_semaphore *sem, const char *name,
@@ -100,16 +104,16 @@ do {                                                              \
  */
 static inline void __down_read(struct rw_semaphore *sem)
 {
-       __asm__ __volatile__(
-               "# beginning down_read\n\t"
-LOCK_PREFIX    "  incl      (%%eax)\n\t" /* adds 0x00000001, returns the old value */
-               "  jns        1f\n"
-               "  call call_rwsem_down_read_failed\n"
-               "1:\n\t"
-               "# ending down_read\n\t"
-               : "+m" (sem->count)
-               : "a" (sem)
-               : "memory", "cc");
+       asm volatile("# beginning down_read\n\t"
+                    LOCK_PREFIX "  incl      (%%eax)\n\t"
+                    /* adds 0x00000001, returns the old value */
+                    "  jns        1f\n"
+                    "  call call_rwsem_down_read_failed\n"
+                    "1:\n\t"
+                    "# ending down_read\n\t"
+                    : "+m" (sem->count)
+                    : "a" (sem)
+                    : "memory", "cc");
 }
 
 /*
@@ -118,21 +122,20 @@ LOCK_PREFIX       "  incl      (%%eax)\n\t" /* adds 0x00000001, returns the old value
 static inline int __down_read_trylock(struct rw_semaphore *sem)
 {
        __s32 result, tmp;
-       __asm__ __volatile__(
-               "# beginning __down_read_trylock\n\t"
-               "  movl      %0,%1\n\t"
-               "1:\n\t"
-               "  movl      %1,%2\n\t"
-               "  addl      %3,%2\n\t"
-               "  jle       2f\n\t"
-LOCK_PREFIX    "  cmpxchgl  %2,%0\n\t"
-               "  jnz       1b\n\t"
-               "2:\n\t"
-               "# ending __down_read_trylock\n\t"
-               : "+m" (sem->count), "=&a" (result), "=&r" (tmp)
-               : "i" (RWSEM_ACTIVE_READ_BIAS)
-               : "memory", "cc");
-       return result>=0 ? 1 : 0;
+       asm volatile("# beginning __down_read_trylock\n\t"
+                    "  movl      %0,%1\n\t"
+                    "1:\n\t"
+                    "  movl         %1,%2\n\t"
+                    "  addl      %3,%2\n\t"
+                    "  jle          2f\n\t"
+                    LOCK_PREFIX "  cmpxchgl  %2,%0\n\t"
+                    "  jnz          1b\n\t"
+                    "2:\n\t"
+                    "# ending __down_read_trylock\n\t"
+                    : "+m" (sem->count), "=&a" (result), "=&r" (tmp)
+                    : "i" (RWSEM_ACTIVE_READ_BIAS)
+                    : "memory", "cc");
+       return result >= 0 ? 1 : 0;
 }
 
 /*
@@ -143,17 +146,18 @@ static inline void __down_write_nested(struct rw_semaphore *sem, int subclass)
        int tmp;
 
        tmp = RWSEM_ACTIVE_WRITE_BIAS;
-       __asm__ __volatile__(
-               "# beginning down_write\n\t"
-LOCK_PREFIX    "  xadd      %%edx,(%%eax)\n\t" /* subtract 0x0000ffff, returns the old value */
-               "  testl     %%edx,%%edx\n\t" /* was the count 0 before? */
-               "  jz        1f\n"
-               "  call call_rwsem_down_write_failed\n"
-               "1:\n"
-               "# ending down_write"
-               : "+m" (sem->count), "=d" (tmp)
-               : "a" (sem), "1" (tmp)
-               : "memory", "cc");
+       asm volatile("# beginning down_write\n\t"
+                    LOCK_PREFIX "  xadd      %%edx,(%%eax)\n\t"
+                    /* subtract 0x0000ffff, returns the old value */
+                    "  testl     %%edx,%%edx\n\t"
+                    /* was the count 0 before? */
+                    "  jz        1f\n"
+                    "  call call_rwsem_down_write_failed\n"
+                    "1:\n"
+                    "# ending down_write"
+                    : "+m" (sem->count), "=d" (tmp)
+                    : "a" (sem), "1" (tmp)
+                    : "memory", "cc");
 }
 
 static inline void __down_write(struct rw_semaphore *sem)
@@ -167,7 +171,7 @@ static inline void __down_write(struct rw_semaphore *sem)
 static inline int __down_write_trylock(struct rw_semaphore *sem)
 {
        signed long ret = cmpxchg(&sem->count,
-                                 RWSEM_UNLOCKED_VALUE, 
+                                 RWSEM_UNLOCKED_VALUE,
                                  RWSEM_ACTIVE_WRITE_BIAS);
        if (ret == RWSEM_UNLOCKED_VALUE)
                return 1;
@@ -180,16 +184,16 @@ static inline int __down_write_trylock(struct rw_semaphore *sem)
 static inline void __up_read(struct rw_semaphore *sem)
 {
        __s32 tmp = -RWSEM_ACTIVE_READ_BIAS;
-       __asm__ __volatile__(
-               "# beginning __up_read\n\t"
-LOCK_PREFIX    "  xadd      %%edx,(%%eax)\n\t" /* subtracts 1, returns the old value */
-               "  jns        1f\n\t"
-               "  call call_rwsem_wake\n"
-               "1:\n"
-               "# ending __up_read\n"
-               : "+m" (sem->count), "=d" (tmp)
-               : "a" (sem), "1" (tmp)
-               : "memory", "cc");
+       asm volatile("# beginning __up_read\n\t"
+                    LOCK_PREFIX "  xadd      %%edx,(%%eax)\n\t"
+                    /* subtracts 1, returns the old value */
+                    "  jns        1f\n\t"
+                    "  call call_rwsem_wake\n"
+                    "1:\n"
+                    "# ending __up_read\n"
+                    : "+m" (sem->count), "=d" (tmp)
+                    : "a" (sem), "1" (tmp)
+                    : "memory", "cc");
 }
 
 /*
@@ -197,17 +201,18 @@ LOCK_PREFIX       "  xadd      %%edx,(%%eax)\n\t" /* subtracts 1, returns the old valu
  */
 static inline void __up_write(struct rw_semaphore *sem)
 {
-       __asm__ __volatile__(
-               "# beginning __up_write\n\t"
-               "  movl      %2,%%edx\n\t"
-LOCK_PREFIX    "  xaddl     %%edx,(%%eax)\n\t" /* tries to transition 0xffff0001 -> 0x00000000 */
-               "  jz       1f\n"
-               "  call call_rwsem_wake\n"
-               "1:\n\t"
-               "# ending __up_write\n"
-               : "+m" (sem->count)
-               : "a" (sem), "i" (-RWSEM_ACTIVE_WRITE_BIAS)
-               : "memory", "cc", "edx");
+       asm volatile("# beginning __up_write\n\t"
+                    "  movl      %2,%%edx\n\t"
+                    LOCK_PREFIX "  xaddl     %%edx,(%%eax)\n\t"
+                    /* tries to transition
+                       0xffff0001 -> 0x00000000 */
+                    "  jz       1f\n"
+                    "  call call_rwsem_wake\n"
+                    "1:\n\t"
+                    "# ending __up_write\n"
+                    : "+m" (sem->count)
+                    : "a" (sem), "i" (-RWSEM_ACTIVE_WRITE_BIAS)
+                    : "memory", "cc", "edx");
 }
 
 /*
@@ -215,16 +220,16 @@ LOCK_PREFIX       "  xaddl     %%edx,(%%eax)\n\t" /* tries to transition 0xffff0001 ->
  */
 static inline void __downgrade_write(struct rw_semaphore *sem)
 {
-       __asm__ __volatile__(
-               "# beginning __downgrade_write\n\t"
-LOCK_PREFIX    "  addl      %2,(%%eax)\n\t" /* transitions 0xZZZZ0001 -> 0xYYYY0001 */
-               "  jns       1f\n\t"
-               "  call call_rwsem_downgrade_wake\n"
-               "1:\n\t"
-               "# ending __downgrade_write\n"
-               : "+m" (sem->count)
-               : "a" (sem), "i" (-RWSEM_WAITING_BIAS)
-               : "memory", "cc");
+       asm volatile("# beginning __downgrade_write\n\t"
+                    LOCK_PREFIX "  addl      %2,(%%eax)\n\t"
+                    /* transitions 0xZZZZ0001 -> 0xYYYY0001 */
+                    "  jns       1f\n\t"
+                    "  call call_rwsem_downgrade_wake\n"
+                    "1:\n\t"
+                    "# ending __downgrade_write\n"
+                    : "+m" (sem->count)
+                    : "a" (sem), "i" (-RWSEM_WAITING_BIAS)
+                    : "memory", "cc");
 }
 
 /*
@@ -232,10 +237,9 @@ LOCK_PREFIX        "  addl      %2,(%%eax)\n\t" /* transitions 0xZZZZ0001 -> 0xYYYY0001
  */
 static inline void rwsem_atomic_add(int delta, struct rw_semaphore *sem)
 {
-       __asm__ __volatile__(
-LOCK_PREFIX    "addl %1,%0"
-               : "+m" (sem->count)
-               : "ir" (delta));
+       asm volatile(LOCK_PREFIX "addl %1,%0"
+                    : "+m" (sem->count)
+                    : "ir" (delta));
 }
 
 /*
@@ -245,12 +249,11 @@ static inline int rwsem_atomic_update(int delta, struct rw_semaphore *sem)
 {
        int tmp = delta;
 
-       __asm__ __volatile__(
-LOCK_PREFIX    "xadd %0,%1"
-               : "+r" (tmp), "+m" (sem->count)
-               : : "memory");
+       asm volatile(LOCK_PREFIX "xadd %0,%1"
+                    : "+r" (tmp), "+m" (sem->count)
+                    : : "memory");
 
-       return tmp+delta;
+       return tmp + delta;
 }
 
 static inline int rwsem_is_locked(struct rw_semaphore *sem)