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>

diff --git a/arch/powerpc/include/asm/local.h b/arch/powerpc/include/asm/local.h
index 600a68bd77f5a89c2da0a39d47d0a99b25fbcbd5..cfbcc31d43add9f30132713fbfe11d7cc2909ff0 100644 (file)
--- a/arch/powerpc/include/asm/local.h
+++ b/arch/powerpc/include/asm/local.h
@@ -2,175 +2,6 @@
 #ifndef _ARCH_POWERPC_LOCAL_H
 #define _ARCH_POWERPC_LOCAL_H
 
-#include <linux/percpu.h>
-#include <linux/atomic.h>
-
-typedef struct
-{
-       atomic_long_t a;
-} local_t;
-
-#define LOCAL_INIT(i)  { ATOMIC_LONG_INIT(i) }
-
-#define local_read(l)  atomic_long_read(&(l)->a)
-#define local_set(l,i) atomic_long_set(&(l)->a, (i))
-
-#define local_add(i,l) atomic_long_add((i),(&(l)->a))
-#define local_sub(i,l) atomic_long_sub((i),(&(l)->a))
-#define local_inc(l)   atomic_long_inc(&(l)->a)
-#define local_dec(l)   atomic_long_dec(&(l)->a)
-
-static __inline__ long local_add_return(long a, local_t *l)
-{
-       long t;
-
-       __asm__ __volatile__(
-"1:"   PPC_LLARX(%0,0,%2,0) "                  # local_add_return\n\
-       add     %0,%1,%0\n"
-       PPC405_ERR77(0,%2)
-       PPC_STLCX       "%0,0,%2 \n\
-       bne-    1b"
-       : "=&r" (t)
-       : "r" (a), "r" (&(l->a.counter))
-       : "cc", "memory");
-
-       return t;
-}
-
-#define local_add_negative(a, l)       (local_add_return((a), (l)) < 0)
-
-static __inline__ long local_sub_return(long a, local_t *l)
-{
-       long t;
-
-       __asm__ __volatile__(
-"1:"   PPC_LLARX(%0,0,%2,0) "                  # local_sub_return\n\
-       subf    %0,%1,%0\n"
-       PPC405_ERR77(0,%2)
-       PPC_STLCX       "%0,0,%2 \n\
-       bne-    1b"
-       : "=&r" (t)
-       : "r" (a), "r" (&(l->a.counter))
-       : "cc", "memory");
-
-       return t;
-}
-
-static __inline__ long local_inc_return(local_t *l)
-{
-       long t;
-
-       __asm__ __volatile__(
-"1:"   PPC_LLARX(%0,0,%1,0) "                  # local_inc_return\n\
-       addic   %0,%0,1\n"
-       PPC405_ERR77(0,%1)
-       PPC_STLCX       "%0,0,%1 \n\
-       bne-    1b"
-       : "=&r" (t)
-       : "r" (&(l->a.counter))
-       : "cc", "xer", "memory");
-
-       return t;
-}
-
-/*
- * local_inc_and_test - increment and test
- * @l: pointer of type local_t
- *
- * Atomically increments @l by 1
- * and returns true if the result is zero, or false for all
- * other cases.
- */
-#define local_inc_and_test(l) (local_inc_return(l) == 0)
-
-static __inline__ long local_dec_return(local_t *l)
-{
-       long t;
-
-       __asm__ __volatile__(
-"1:"   PPC_LLARX(%0,0,%1,0) "                  # local_dec_return\n\
-       addic   %0,%0,-1\n"
-       PPC405_ERR77(0,%1)
-       PPC_STLCX       "%0,0,%1\n\
-       bne-    1b"
-       : "=&r" (t)
-       : "r" (&(l->a.counter))
-       : "cc", "xer", "memory");
-
-       return t;
-}
-
-#define local_cmpxchg(l, o, n) \
-       (cmpxchg_local(&((l)->a.counter), (o), (n)))
-#define local_xchg(l, n) (xchg_local(&((l)->a.counter), (n)))
-
-/**
- * local_add_unless - add unless the number is a given value
- * @l: pointer of type local_t
- * @a: the amount to add to v...
- * @u: ...unless v is equal to u.
- *
- * Atomically adds @a to @l, so long as it was not @u.
- * Returns non-zero if @l was not @u, and zero otherwise.
- */
-static __inline__ int local_add_unless(local_t *l, long a, long u)
-{
-       long t;
-
-       __asm__ __volatile__ (
-"1:"   PPC_LLARX(%0,0,%1,0) "                  # local_add_unless\n\
-       cmpw    0,%0,%3 \n\
-       beq-    2f \n\
-       add     %0,%2,%0 \n"
-       PPC405_ERR77(0,%2)
-       PPC_STLCX       "%0,0,%1 \n\
-       bne-    1b \n"
-"      subf    %0,%2,%0 \n\
-2:"
-       : "=&r" (t)
-       : "r" (&(l->a.counter)), "r" (a), "r" (u)
-       : "cc", "memory");
-
-       return t != u;
-}
-
-#define local_inc_not_zero(l) local_add_unless((l), 1, 0)
-
-#define local_sub_and_test(a, l)       (local_sub_return((a), (l)) == 0)
-#define local_dec_and_test(l)          (local_dec_return((l)) == 0)
-
-/*
- * Atomically test *l and decrement if it is greater than 0.
- * The function returns the old value of *l minus 1.
- */
-static __inline__ long local_dec_if_positive(local_t *l)
-{
-       long t;
-
-       __asm__ __volatile__(
-"1:"   PPC_LLARX(%0,0,%1,0) "                  # local_dec_if_positive\n\
-       cmpwi   %0,1\n\
-       addi    %0,%0,-1\n\
-       blt-    2f\n"
-       PPC405_ERR77(0,%1)
-       PPC_STLCX       "%0,0,%1\n\
-       bne-    1b"
-       "\n\
-2:"    : "=&b" (t)
-       : "r" (&(l->a.counter))
-       : "cc", "memory");
-
-       return t;
-}
-
-/* Use these for per-cpu local_t variables: on some archs they are
- * much more efficient than these naive implementations.  Note they take
- * a variable, not an address.
- */
-
-#define __local_inc(l)         ((l)->a.counter++)
-#define __local_dec(l)         ((l)->a.counter++)
-#define __local_add(i,l)       ((l)->a.counter+=(i))
-#define __local_sub(i,l)       ((l)->a.counter-=(i))
+#include <asm-generic/local.h>
 
 #endif /* _ARCH_POWERPC_LOCAL_H */