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local_t: powerpc extension
[akpm@linux-foundation.org: build fixes] Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> Cc: Paul Mackerras <paulus@samba.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Mathieu Desnoyers
Linus Torvalds
parent
14c846a4d8
commit
6d8944a0d7
@ -1 +1,200 @@
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#include <asm-generic/local.h>
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#ifndef _ARCH_POWERPC_LOCAL_H
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#define _ARCH_POWERPC_LOCAL_H
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#include <linux/percpu.h>
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#include <asm/atomic.h>
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typedef struct
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{
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atomic_long_t a;
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} local_t;
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#define LOCAL_INIT(i) { ATOMIC_LONG_INIT(i) }
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#define local_read(l) atomic_long_read(&(l)->a)
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#define local_set(l,i) atomic_long_set(&(l)->a, (i))
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#define local_add(i,l) atomic_long_add((i),(&(l)->a))
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#define local_sub(i,l) atomic_long_sub((i),(&(l)->a))
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#define local_inc(l) atomic_long_inc(&(l)->a)
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#define local_dec(l) atomic_long_dec(&(l)->a)
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static __inline__ long local_add_return(long a, local_t *l)
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{
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long t;
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__asm__ __volatile__(
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"1:" PPC_LLARX "%0,0,%2 # local_add_return\n\
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add %0,%1,%0\n"
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PPC405_ERR77(0,%2)
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PPC_STLCX "%0,0,%2 \n\
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bne- 1b"
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: "=&r" (t)
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: "r" (a), "r" (&(l->a.counter))
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: "cc", "memory");
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return t;
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}
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#define local_add_negative(a, l) (local_add_return((a), (l)) < 0)
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static __inline__ long local_sub_return(long a, local_t *l)
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{
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long t;
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__asm__ __volatile__(
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"1:" PPC_LLARX "%0,0,%2 # local_sub_return\n\
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subf %0,%1,%0\n"
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PPC405_ERR77(0,%2)
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PPC_STLCX "%0,0,%2 \n\
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bne- 1b"
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: "=&r" (t)
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: "r" (a), "r" (&(l->a.counter))
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: "cc", "memory");
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return t;
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}
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static __inline__ long local_inc_return(local_t *l)
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{
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long t;
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__asm__ __volatile__(
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"1:" PPC_LLARX "%0,0,%1 # local_inc_return\n\
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addic %0,%0,1\n"
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PPC405_ERR77(0,%1)
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PPC_STLCX "%0,0,%1 \n\
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bne- 1b"
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: "=&r" (t)
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: "r" (&(l->a.counter))
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: "cc", "memory");
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return t;
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}
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/*
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* local_inc_and_test - increment and test
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* @l: pointer of type local_t
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*
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* Atomically increments @l by 1
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* and returns true if the result is zero, or false for all
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* other cases.
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*/
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#define local_inc_and_test(l) (local_inc_return(l) == 0)
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static __inline__ long local_dec_return(local_t *l)
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{
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long t;
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__asm__ __volatile__(
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"1:" PPC_LLARX "%0,0,%1 # local_dec_return\n\
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addic %0,%0,-1\n"
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PPC405_ERR77(0,%1)
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PPC_STLCX "%0,0,%1\n\
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bne- 1b"
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: "=&r" (t)
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: "r" (&(l->a.counter))
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: "cc", "memory");
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return t;
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}
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#define local_cmpxchg(l, o, n) \
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(cmpxchg_local(&((l)->a.counter), (o), (n)))
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#define local_xchg(l, n) (xchg_local(&((l)->a.counter), (n)))
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/**
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* local_add_unless - add unless the number is a given value
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* @l: pointer of type local_t
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* @a: the amount to add to v...
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* @u: ...unless v is equal to u.
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*
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* Atomically adds @a to @l, so long as it was not @u.
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* Returns non-zero if @l was not @u, and zero otherwise.
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*/
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static __inline__ int local_add_unless(local_t *l, long a, long u)
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{
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long t;
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__asm__ __volatile__ (
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"1:" PPC_LLARX "%0,0,%1 # local_add_unless\n\
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cmpw 0,%0,%3 \n\
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beq- 2f \n\
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add %0,%2,%0 \n"
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PPC405_ERR77(0,%2)
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PPC_STLCX "%0,0,%1 \n\
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bne- 1b \n"
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" subf %0,%2,%0 \n\
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2:"
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: "=&r" (t)
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: "r" (&(l->a.counter)), "r" (a), "r" (u)
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: "cc", "memory");
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return t != u;
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}
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#define local_inc_not_zero(l) local_add_unless((l), 1, 0)
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#define local_sub_and_test(a, l) (local_sub_return((a), (l)) == 0)
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#define local_dec_and_test(l) (local_dec_return((l)) == 0)
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/*
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* Atomically test *l and decrement if it is greater than 0.
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* The function returns the old value of *l minus 1.
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*/
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static __inline__ long local_dec_if_positive(local_t *l)
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{
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long t;
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__asm__ __volatile__(
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"1:" PPC_LLARX "%0,0,%1 # local_dec_if_positive\n\
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cmpwi %0,1\n\
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addi %0,%0,-1\n\
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blt- 2f\n"
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PPC405_ERR77(0,%1)
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PPC_STLCX "%0,0,%1\n\
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bne- 1b"
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"\n\
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2:" : "=&b" (t)
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: "r" (&(l->a.counter))
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: "cc", "memory");
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return t;
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}
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/* Use these for per-cpu local_t variables: on some archs they are
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* much more efficient than these naive implementations. Note they take
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* a variable, not an address.
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*/
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#define __local_inc(l) ((l)->a.counter++)
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#define __local_dec(l) ((l)->a.counter++)
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#define __local_add(i,l) ((l)->a.counter+=(i))
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#define __local_sub(i,l) ((l)->a.counter-=(i))
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/* Need to disable preemption for the cpu local counters otherwise we could
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still access a variable of a previous CPU in a non atomic way. */
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#define cpu_local_wrap_v(l) \
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({ local_t res__; \
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preempt_disable(); \
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res__ = (l); \
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preempt_enable(); \
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res__; })
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#define cpu_local_wrap(l) \
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({ preempt_disable(); \
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l; \
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preempt_enable(); }) \
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#define cpu_local_read(l) cpu_local_wrap_v(local_read(&__get_cpu_var(l)))
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#define cpu_local_set(l, i) cpu_local_wrap(local_set(&__get_cpu_var(l), (i)))
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#define cpu_local_inc(l) cpu_local_wrap(local_inc(&__get_cpu_var(l)))
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#define cpu_local_dec(l) cpu_local_wrap(local_dec(&__get_cpu_var(l)))
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#define cpu_local_add(i, l) cpu_local_wrap(local_add((i), &__get_cpu_var(l)))
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#define cpu_local_sub(i, l) cpu_local_wrap(local_sub((i), &__get_cpu_var(l)))
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#define __cpu_local_inc(l) cpu_local_inc(l)
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#define __cpu_local_dec(l) cpu_local_dec(l)
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#define __cpu_local_add(i, l) cpu_local_add((i), (l))
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#define __cpu_local_sub(i, l) cpu_local_sub((i), (l))
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#endif /* _ARCH_POWERPC_LOCAL_H */
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