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include/asm-x86/rwsem.h: checkpatch cleanups - formatting only
Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Joe Perches
Ingo Molnar
parent
0f4fc8c1dc
commit
6e5609a97a
@ -56,14 +56,16 @@ extern asmregparm struct rw_semaphore *
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/*
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* the semaphore definition
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*/
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struct rw_semaphore {
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signed long count;
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#define RWSEM_UNLOCKED_VALUE 0x00000000
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#define RWSEM_ACTIVE_BIAS 0x00000001
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#define RWSEM_ACTIVE_MASK 0x0000ffff
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#define RWSEM_WAITING_BIAS (-0x00010000)
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#define RWSEM_ACTIVE_READ_BIAS RWSEM_ACTIVE_BIAS
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#define RWSEM_ACTIVE_WRITE_BIAS (RWSEM_WAITING_BIAS + RWSEM_ACTIVE_BIAS)
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struct rw_semaphore {
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signed long count;
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spinlock_t wait_lock;
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struct list_head wait_list;
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#ifdef CONFIG_DEBUG_LOCK_ALLOC
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@ -78,11 +80,13 @@ struct rw_semaphore {
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#endif
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#define __RWSEM_INITIALIZER(name) \
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{ RWSEM_UNLOCKED_VALUE, __SPIN_LOCK_UNLOCKED((name).wait_lock), \
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LIST_HEAD_INIT((name).wait_list) __RWSEM_DEP_MAP_INIT(name) }
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#define __RWSEM_INITIALIZER(name) \
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{ \
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RWSEM_UNLOCKED_VALUE, __SPIN_LOCK_UNLOCKED((name).wait_lock), \
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LIST_HEAD_INIT((name).wait_list) __RWSEM_DEP_MAP_INIT(name) \
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}
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#define DECLARE_RWSEM(name) \
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#define DECLARE_RWSEM(name) \
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struct rw_semaphore name = __RWSEM_INITIALIZER(name)
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extern void __init_rwsem(struct rw_semaphore *sem, const char *name,
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@ -100,16 +104,16 @@ do { \
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*/
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static inline void __down_read(struct rw_semaphore *sem)
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{
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__asm__ __volatile__(
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"# beginning down_read\n\t"
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LOCK_PREFIX " incl (%%eax)\n\t" /* adds 0x00000001, returns the old value */
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" jns 1f\n"
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" call call_rwsem_down_read_failed\n"
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"1:\n\t"
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"# ending down_read\n\t"
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: "+m" (sem->count)
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: "a" (sem)
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: "memory", "cc");
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asm volatile("# beginning down_read\n\t"
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LOCK_PREFIX " incl (%%eax)\n\t"
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/* adds 0x00000001, returns the old value */
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" jns 1f\n"
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" call call_rwsem_down_read_failed\n"
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"1:\n\t"
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"# ending down_read\n\t"
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: "+m" (sem->count)
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: "a" (sem)
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: "memory", "cc");
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}
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/*
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@ -118,21 +122,20 @@ LOCK_PREFIX " incl (%%eax)\n\t" /* adds 0x00000001, returns the old value
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static inline int __down_read_trylock(struct rw_semaphore *sem)
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{
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__s32 result, tmp;
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__asm__ __volatile__(
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"# beginning __down_read_trylock\n\t"
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" movl %0,%1\n\t"
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"1:\n\t"
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" movl %1,%2\n\t"
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" addl %3,%2\n\t"
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" jle 2f\n\t"
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LOCK_PREFIX " cmpxchgl %2,%0\n\t"
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" jnz 1b\n\t"
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"2:\n\t"
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"# ending __down_read_trylock\n\t"
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: "+m" (sem->count), "=&a" (result), "=&r" (tmp)
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: "i" (RWSEM_ACTIVE_READ_BIAS)
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: "memory", "cc");
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return result>=0 ? 1 : 0;
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asm volatile("# beginning __down_read_trylock\n\t"
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" movl %0,%1\n\t"
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"1:\n\t"
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" movl %1,%2\n\t"
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" addl %3,%2\n\t"
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" jle 2f\n\t"
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LOCK_PREFIX " cmpxchgl %2,%0\n\t"
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" jnz 1b\n\t"
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"2:\n\t"
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"# ending __down_read_trylock\n\t"
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: "+m" (sem->count), "=&a" (result), "=&r" (tmp)
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: "i" (RWSEM_ACTIVE_READ_BIAS)
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: "memory", "cc");
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return result >= 0 ? 1 : 0;
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}
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/*
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@ -143,17 +146,18 @@ static inline void __down_write_nested(struct rw_semaphore *sem, int subclass)
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int tmp;
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tmp = RWSEM_ACTIVE_WRITE_BIAS;
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__asm__ __volatile__(
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"# beginning down_write\n\t"
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LOCK_PREFIX " xadd %%edx,(%%eax)\n\t" /* subtract 0x0000ffff, returns the old value */
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" testl %%edx,%%edx\n\t" /* was the count 0 before? */
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" jz 1f\n"
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" call call_rwsem_down_write_failed\n"
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"1:\n"
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"# ending down_write"
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: "+m" (sem->count), "=d" (tmp)
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: "a" (sem), "1" (tmp)
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: "memory", "cc");
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asm volatile("# beginning down_write\n\t"
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LOCK_PREFIX " xadd %%edx,(%%eax)\n\t"
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/* subtract 0x0000ffff, returns the old value */
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" testl %%edx,%%edx\n\t"
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/* was the count 0 before? */
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" jz 1f\n"
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" call call_rwsem_down_write_failed\n"
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"1:\n"
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"# ending down_write"
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: "+m" (sem->count), "=d" (tmp)
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: "a" (sem), "1" (tmp)
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: "memory", "cc");
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}
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static inline void __down_write(struct rw_semaphore *sem)
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@ -167,7 +171,7 @@ static inline void __down_write(struct rw_semaphore *sem)
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static inline int __down_write_trylock(struct rw_semaphore *sem)
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{
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signed long ret = cmpxchg(&sem->count,
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RWSEM_UNLOCKED_VALUE,
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RWSEM_UNLOCKED_VALUE,
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RWSEM_ACTIVE_WRITE_BIAS);
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if (ret == RWSEM_UNLOCKED_VALUE)
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return 1;
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@ -180,16 +184,16 @@ static inline int __down_write_trylock(struct rw_semaphore *sem)
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static inline void __up_read(struct rw_semaphore *sem)
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{
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__s32 tmp = -RWSEM_ACTIVE_READ_BIAS;
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__asm__ __volatile__(
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"# beginning __up_read\n\t"
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LOCK_PREFIX " xadd %%edx,(%%eax)\n\t" /* subtracts 1, returns the old value */
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" jns 1f\n\t"
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" call call_rwsem_wake\n"
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"1:\n"
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"# ending __up_read\n"
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: "+m" (sem->count), "=d" (tmp)
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: "a" (sem), "1" (tmp)
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: "memory", "cc");
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asm volatile("# beginning __up_read\n\t"
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LOCK_PREFIX " xadd %%edx,(%%eax)\n\t"
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/* subtracts 1, returns the old value */
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" jns 1f\n\t"
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" call call_rwsem_wake\n"
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"1:\n"
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"# ending __up_read\n"
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: "+m" (sem->count), "=d" (tmp)
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: "a" (sem), "1" (tmp)
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: "memory", "cc");
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}
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/*
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@ -197,17 +201,18 @@ LOCK_PREFIX " xadd %%edx,(%%eax)\n\t" /* subtracts 1, returns the old valu
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*/
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static inline void __up_write(struct rw_semaphore *sem)
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{
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__asm__ __volatile__(
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"# beginning __up_write\n\t"
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" movl %2,%%edx\n\t"
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LOCK_PREFIX " xaddl %%edx,(%%eax)\n\t" /* tries to transition 0xffff0001 -> 0x00000000 */
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" jz 1f\n"
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" call call_rwsem_wake\n"
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"1:\n\t"
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"# ending __up_write\n"
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: "+m" (sem->count)
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: "a" (sem), "i" (-RWSEM_ACTIVE_WRITE_BIAS)
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: "memory", "cc", "edx");
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asm volatile("# beginning __up_write\n\t"
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" movl %2,%%edx\n\t"
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LOCK_PREFIX " xaddl %%edx,(%%eax)\n\t"
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/* tries to transition
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0xffff0001 -> 0x00000000 */
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" jz 1f\n"
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" call call_rwsem_wake\n"
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"1:\n\t"
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"# ending __up_write\n"
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: "+m" (sem->count)
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: "a" (sem), "i" (-RWSEM_ACTIVE_WRITE_BIAS)
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: "memory", "cc", "edx");
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}
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/*
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@ -215,16 +220,16 @@ LOCK_PREFIX " xaddl %%edx,(%%eax)\n\t" /* tries to transition 0xffff0001 ->
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*/
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static inline void __downgrade_write(struct rw_semaphore *sem)
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{
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__asm__ __volatile__(
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"# beginning __downgrade_write\n\t"
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LOCK_PREFIX " addl %2,(%%eax)\n\t" /* transitions 0xZZZZ0001 -> 0xYYYY0001 */
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" jns 1f\n\t"
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" call call_rwsem_downgrade_wake\n"
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"1:\n\t"
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"# ending __downgrade_write\n"
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: "+m" (sem->count)
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: "a" (sem), "i" (-RWSEM_WAITING_BIAS)
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: "memory", "cc");
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asm volatile("# beginning __downgrade_write\n\t"
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LOCK_PREFIX " addl %2,(%%eax)\n\t"
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/* transitions 0xZZZZ0001 -> 0xYYYY0001 */
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" jns 1f\n\t"
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" call call_rwsem_downgrade_wake\n"
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"1:\n\t"
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"# ending __downgrade_write\n"
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: "+m" (sem->count)
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: "a" (sem), "i" (-RWSEM_WAITING_BIAS)
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: "memory", "cc");
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}
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/*
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@ -232,10 +237,9 @@ LOCK_PREFIX " addl %2,(%%eax)\n\t" /* transitions 0xZZZZ0001 -> 0xYYYY0001
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*/
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static inline void rwsem_atomic_add(int delta, struct rw_semaphore *sem)
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{
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__asm__ __volatile__(
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LOCK_PREFIX "addl %1,%0"
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: "+m" (sem->count)
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: "ir" (delta));
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asm volatile(LOCK_PREFIX "addl %1,%0"
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: "+m" (sem->count)
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: "ir" (delta));
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}
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/*
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@ -245,12 +249,11 @@ static inline int rwsem_atomic_update(int delta, struct rw_semaphore *sem)
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{
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int tmp = delta;
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__asm__ __volatile__(
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LOCK_PREFIX "xadd %0,%1"
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: "+r" (tmp), "+m" (sem->count)
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: : "memory");
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asm volatile(LOCK_PREFIX "xadd %0,%1"
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: "+r" (tmp), "+m" (sem->count)
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: : "memory");
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return tmp+delta;
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return tmp + delta;
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}
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static inline int rwsem_is_locked(struct rw_semaphore *sem)
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