* Andrew Morton ([EMAIL PROTECTED]) wrote:
> On Sun, 11 Feb 2007 14:18:12 -0500 Mathieu Desnoyers <[EMAIL PROTECTED]>
> wrote:
>
> > local_t : powerpc extension
>
> This diff contains changes which are also present in "[PATCH 07/10]
> atomic.h : Add atomic64 cmpxchg, xchg and add_unless to powerpc", resulting
> in rather a mess.
>
> I dropped the duplicated hunks from the later patch rather than this one,
> but I haven't tried to compile the result yet.
>
Yes, sorry about that : the atomic.h diff has been duplicated in both
the local and atomic changes.
The change to system.h for local.h is to add the xchg_local and
cmpxchg_local, while the change for atomic.h is to simply remove the
#include from system.h.
Here is a proper local.h diff, if it happens to become necessary, but
simply removing the duplicated asm-powerpc/system.h hunks will be ok.
Thanks,
Signed-off-by: Mathieu Desnoyers <[EMAIL PROTECTED]>
--- a/include/asm-powerpc/local.h
+++ b/include/asm-powerpc/local.h
@@ -1 +1,342 @@
-#include
+#ifndef _ARCH_POWERPC_LOCAL_H
+#define _ARCH_POWERPC_LOCAL_H
+
+#include
+#include
+
+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)
+
+#ifndef __powerpc64__
+
+static __inline__ int local_add_return(int a, local_t *l)
+{
+ int t;
+
+ __asm__ __volatile__(
+"1:lwarx %0,0,%2 # local_add_return\n\
+ add %0,%1,%0\n"
+ PPC405_ERR77(0,%2)
+" stwcx. %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__ int local_sub_return(int a, local_t *l)
+{
+ int t;
+
+ __asm__ __volatile__(
+"1:lwarx %0,0,%2 # local_sub_return\n\
+ subf%0,%1,%0\n"
+ PPC405_ERR77(0,%2)
+" stwcx. %0,0,%2 \n\
+ bne-1b"
+ : "=&r" (t)
+ : "r" (a), "r" (&(l->a.counter))
+ : "cc", "memory");
+
+ return t;
+}
+
+static __inline__ int local_inc_return(local_t *l)
+{
+ int t;
+
+ __asm__ __volatile__(
+"1:lwarx %0,0,%1 # local_inc_return\n\
+ addic %0,%0,1\n"
+ PPC405_ERR77(0,%1)
+" stwcx. %0,0,%1 \n\
+ bne-1b"
+ : "=&r" (t)
+ : "r" (&(l->a.counter))
+ : "cc", "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__ int local_dec_return(local_t *l)
+{
+ int t;
+
+ __asm__ __volatile__(
+"1:lwarx %0,0,%1 # local_dec_return\n\
+ addic %0,%0,-1\n"
+ PPC405_ERR77(0,%1)
+" stwcx. %0,0,%1\n\
+ bne-1b"
+ : "=&r" (t)
+ : "r" (&(l->a.counter))
+ : "cc", "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, int a, int u)
+{
+ int t;
+
+ __asm__ __volatile__ (
+"1:lwarx %0,0,%1 # local_add_unless\n\
+ cmpw0,%0,%3 \n\
+ beq-2f \n\
+ add %0,%2,%0 \n"
+ PPC405_ERR77(0,%2)
+" stwcx. %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__ int local_dec_if_positive(local_t *l)
+{
+ int t;
+
+ __asm__ __volatile__(
+"1:lwarx %0,0,%1 # local_dec_if_positive\n\
+ cmpwi %0,1\n\
+ addi%0,%0,-1\n\
+ blt-2f\n"
+ PPC405_ERR77(0,%1)
+" stwcx. %0,0,%1\n\
+ bne-1b"
+ "\n\
+2:": "=&b" (t)
+