powerpc: use generic atomic implementation for local_t
powerpc implements local_t with atomic operations. There is already an asm-generic implementation which does this using atomic_t. Signed-off-by: Madhavan Srinivasan <maddy@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Madhavan Srinivasan
Michael Ellerman
parent
c6424382de
commit
3b7e302086
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@ -2,175 +2,6 @@
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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 <linux/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,%2,0) " # 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,%2,0) " # 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,%1,0) " # 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", "xer", "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,%1,0) " # 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", "xer", "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,%1,0) " # 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,%1,0) " # 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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#include <asm-generic/local.h>
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#endif /* _ARCH_POWERPC_LOCAL_H */
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