4 files changed, 71 insertions, 32 deletions

diff --git a/arch/alpha/include/asm/atomic.h b/arch/alpha/include/asm/atomic.h
index c2cbe4fc391c..78b03ef39f6f 100644
--- a/arch/alpha/include/asm/atomic.h
+++ b/arch/alpha/include/asm/atomic.h
@@ -186,17 +186,24 @@ static __inline__ long atomic64_sub_return(long i, atomic64_t * v)
  */
 static __inline__ int __atomic_add_unless(atomic_t *v, int a, int u)
 {
-        int c, old;
-        c = atomic_read(v);
-        for (;;) {
-                if (unlikely(c == (u)))
-                        break;
-                old = atomic_cmpxchg((v), c, c + (a));
-                if (likely(old == c))
-                        break;
-                c = old;
-        }
-        return c;
+        int c, new, old;
+        smp_mb();
+        __asm__ __volatile__(
+        "1:     ldl_l   %[old],%[mem]\n"
+        "       cmpeq   %[old],%[u],%[c]\n"
+        "       addl    %[old],%[a],%[new]\n"
+        "       bne     %[c],2f\n"
+        "       stl_c   %[new],%[mem]\n"
+        "       beq     %[new],3f\n"
+        "2:\n"
+        ".subsection 2\n"
+        "3:     br      1b\n"
+        ".previous"
+        : [old] "=&r"(old), [new] "=&r"(new), [c] "=&r"(c)
+        : [mem] "m"(*v), [a] "rI"(a), [u] "rI"((long)u)
+        : "memory");
+        smp_mb();
+        return old;
 }
 
 
@@ -207,21 +214,56 @@ static __inline__ int __atomic_add_unless(atomic_t *v, int a, int u)
  * @u: ...unless v is equal to u.
  *
  * Atomically adds @a to @v, so long as it was not @u.
- * Returns the old value of @v.
+ * Returns true iff @v was not @u.
  */
 static __inline__ int atomic64_add_unless(atomic64_t *v, long a, long u)
 {
-        long c, old;
-        c = atomic64_read(v);
-        for (;;) {
-                if (unlikely(c == (u)))
-                        break;
-                old = atomic64_cmpxchg((v), c, c + (a));
-                if (likely(old == c))
-                        break;
-                c = old;
-        }
-        return c != (u);
+        long c, tmp;
+        smp_mb();
+        __asm__ __volatile__(
+        "1:     ldq_l   %[tmp],%[mem]\n"
+        "       cmpeq   %[tmp],%[u],%[c]\n"
+        "       addq    %[tmp],%[a],%[tmp]\n"
+        "       bne     %[c],2f\n"
+        "       stq_c   %[tmp],%[mem]\n"
+        "       beq     %[tmp],3f\n"
+        "2:\n"
+        ".subsection 2\n"
+        "3:     br      1b\n"
+        ".previous"
+        : [tmp] "=&r"(tmp), [c] "=&r"(c)
+        : [mem] "m"(*v), [a] "rI"(a), [u] "rI"(u)
+        : "memory");
+        smp_mb();
+        return !c;
+}
+
+/*
+ * atomic64_dec_if_positive - decrement by 1 if old value positive
+ * @v: pointer of type atomic_t
+ *
+ * The function returns the old value of *v minus 1, even if
+ * the atomic variable, v, was not decremented.
+ */
+static inline long atomic64_dec_if_positive(atomic64_t *v)
+{
+        long old, tmp;
+        smp_mb();
+        __asm__ __volatile__(
+        "1:     ldq_l   %[old],%[mem]\n"
+        "       subq    %[old],1,%[tmp]\n"
+        "       ble     %[old],2f\n"
+        "       stq_c   %[tmp],%[mem]\n"
+        "       beq     %[tmp],3f\n"
+        "2:\n"
+        ".subsection 2\n"
+        "3:     br      1b\n"
+        ".previous"
+        : [old] "=&r"(old), [tmp] "=&r"(tmp)
+        : [mem] "m"(*v)
+        : "memory");
+        smp_mb();
+        return old - 1;
 }
 
 #define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0)
diff --git a/arch/alpha/include/asm/param.h b/arch/alpha/include/asm/param.h
index bf46af51941b..a5b68b268bcf 100644
--- a/arch/alpha/include/asm/param.h
+++ b/arch/alpha/include/asm/param.h
@@ -3,7 +3,9 @@
 
 #include <uapi/asm/param.h>
 
-#define HZ              CONFIG_HZ
-#define USER_HZ         HZ
-# define CLOCKS_PER_SEC HZ      /* frequency at which times() counts */
+# undef HZ
+# define HZ             CONFIG_HZ
+# define USER_HZ        1024
+# define CLOCKS_PER_SEC USER_HZ /* frequency at which times() counts */
+
 #endif /* _ASM_ALPHA_PARAM_H */
diff --git a/arch/alpha/include/asm/spinlock.h b/arch/alpha/include/asm/spinlock.h
index 3bba21e41b81..37b570d01202 100644
--- a/arch/alpha/include/asm/spinlock.h
+++ b/arch/alpha/include/asm/spinlock.h
@@ -168,8 +168,4 @@ static inline void arch_write_unlock(arch_rwlock_t * lock)
 #define arch_read_lock_flags(lock, flags) arch_read_lock(lock)
 #define arch_write_lock_flags(lock, flags) arch_write_lock(lock)
 
-#define arch_spin_relax(lock)   cpu_relax()
-#define arch_read_relax(lock)   cpu_relax()
-#define arch_write_relax(lock)  cpu_relax()
-
 #endif /* _ALPHA_SPINLOCK_H */
diff --git a/arch/alpha/include/asm/unistd.h b/arch/alpha/include/asm/unistd.h
index 43baee17acdf..f2c94402e2c8 100644
--- a/arch/alpha/include/asm/unistd.h
+++ b/arch/alpha/include/asm/unistd.h
@@ -3,8 +3,7 @@
 
 #include <uapi/asm/unistd.h>
 
-
-#define NR_SYSCALLS                     506
+#define NR_SYSCALLS                     508
 
 #define __ARCH_WANT_OLD_READDIR
 #define __ARCH_WANT_STAT64