fedora core 6 1.2949 + vserver 2.2.0

[linux-2.6.git] / include / asm-i386 / futex.h

diff --git a/include/asm-i386/futex.h b/include/asm-i386/futex.h
index 44b9db8..438ef0e 100644 (file)
--- a/include/asm-i386/futex.h
+++ b/include/asm-i386/futex.h
@@ -20,8 +20,8 @@
        .align  8\n\
        .long   1b,3b\n\
        .previous"                                              \
-       : "=r" (oldval), "=r" (ret), "=m" (*uaddr)              \
-       : "i" (-EFAULT), "m" (*uaddr), "0" (oparg), "1" (0))
+       : "=r" (oldval), "=r" (ret), "+m" (*uaddr)              \
+       : "i" (-EFAULT), "0" (oparg), "1" (0))
 
 #define __futex_atomic_op2(insn, ret, oldval, uaddr, oparg) \
   __asm__ __volatile (                                         \
@@ -38,9 +38,9 @@
        .align  8\n\
        .long   1b,4b,2b,4b\n\
        .previous"                                              \
-       : "=&a" (oldval), "=&r" (ret), "=m" (*uaddr),           \
+       : "=&a" (oldval), "=&r" (ret), "+m" (*uaddr),           \
          "=&r" (tem)                                           \
-       : "r" (oparg), "i" (-EFAULT), "m" (*uaddr), "1" (0))
+       : "r" (oparg), "i" (-EFAULT), "1" (0))
 
 static inline int
 futex_atomic_op_inuser (int encoded_op, int __user *uaddr)
@@ -56,7 +56,7 @@ 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();
 
        if (op == FUTEX_OP_SET)
                __futex_atomic_op1("xchgl %0, %2", ret, oldval, uaddr, oparg);
@@ -88,7 +88,7 @@ futex_atomic_op_inuser (int encoded_op, int __user *uaddr)
                }
        }
 
-       dec_preempt_count();
+       pagefault_enable();
 
        if (!ret) {
                switch (cmp) {
@@ -104,5 +104,32 @@ 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)
+{
+       if (!access_ok(VERIFY_WRITE, uaddr, sizeof(int)))
+               return -EFAULT;
+
+       __asm__ __volatile__(
+               "1:     " LOCK_PREFIX "cmpxchgl %3, %1          \n"
+
+               "2:     .section .fixup, \"ax\"                 \n"
+               "3:     mov     %2, %0                          \n"
+               "       jmp     2b                              \n"
+               "       .previous                               \n"
+
+               "       .section __ex_table, \"a\"              \n"
+               "       .align  8                               \n"
+               "       .long   1b,3b                           \n"
+               "       .previous                               \n"
+
+               : "=a" (oldval), "+m" (*uaddr)
+               : "i" (-EFAULT), "r" (newval), "0" (oldval)
+               : "memory"
+       );
+
+       return oldval;
+}
+
 #endif
 #endif