fedora core 6 1.2949 + vserver 2.2.0

[linux-2.6.git] / include / asm-powerpc / futex.h

diff --git a/include/asm-powerpc/futex.h b/include/asm-powerpc/futex.h
index 39e85f3..3f3673f 100644 (file)
--- a/include/asm-powerpc/futex.h
+++ b/include/asm-powerpc/futex.h
@@ -43,7 +43,7 @@ static inline int futex_atomic_op_inuser (int encoded_op, int __user *uaddr)
        if (! access_ok (VERIFY_WRITE, uaddr, sizeof(int)))
                return -EFAULT;
 
-       inc_preempt_count();
+       pagefault_disable();
 
        switch (op) {
        case FUTEX_OP_SET:
@@ -65,7 +65,7 @@ static inline int futex_atomic_op_inuser (int encoded_op, int __user *uaddr)
                ret = -ENOSYS;
        }
 
-       dec_preempt_count();
+       pagefault_enable();
 
        if (!ret) {
                switch (cmp) {
@@ -81,5 +81,37 @@ static inline int futex_atomic_op_inuser (int encoded_op, int __user *uaddr)
        return ret;
 }
 
+static inline int
+futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval)
+{
+       int prev;
+
+       if (!access_ok(VERIFY_WRITE, uaddr, sizeof(int)))
+               return -EFAULT;
+
+        __asm__ __volatile__ (
+        LWSYNC_ON_SMP
+"1:     lwarx   %0,0,%2         # futex_atomic_cmpxchg_inatomic\n\
+        cmpw    0,%0,%3\n\
+        bne-    3f\n"
+        PPC405_ERR77(0,%2)
+"2:     stwcx.  %4,0,%2\n\
+        bne-    1b\n"
+        ISYNC_ON_SMP
+"3:    .section .fixup,\"ax\"\n\
+4:     li      %0,%5\n\
+       b       3b\n\
+       .previous\n\
+       .section __ex_table,\"a\"\n\
+       .align 3\n\
+       " PPC_LONG "1b,4b,2b,4b\n\
+       .previous" \
+        : "=&r" (prev), "+m" (*uaddr)
+        : "r" (uaddr), "r" (oldval), "r" (newval), "i" (-EFAULT)
+        : "cc", "memory");
+
+        return prev;
+}
+
 #endif /* __KERNEL__ */
 #endif /* _ASM_POWERPC_FUTEX_H */