Merge mulgrave-w:git/scsi-misc-2.6

[pandora-kernel.git] / include / asm-s390 / futex.h

diff --git a/include/asm-s390/futex.h b/include/asm-s390/futex.h
index 6a332a9..5e261e1 100644 (file)
--- a/include/asm-s390/futex.h
+++ b/include/asm-s390/futex.h
@@ -1,6 +1,50 @@
-#ifndef _ASM_FUTEX_H
-#define _ASM_FUTEX_H
+#ifndef _ASM_S390_FUTEX_H
+#define _ASM_S390_FUTEX_H
 
-#include <asm-generic/futex.h>
+#ifdef __KERNEL__
 
-#endif
+#include <linux/futex.h>
+#include <asm/errno.h>
+#include <asm/uaccess.h>
+
+static inline int futex_atomic_op_inuser (int encoded_op, int __user *uaddr)
+{
+       int op = (encoded_op >> 28) & 7;
+       int cmp = (encoded_op >> 24) & 15;
+       int oparg = (encoded_op << 8) >> 20;
+       int cmparg = (encoded_op << 20) >> 20;
+       int oldval, ret;
+
+       if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
+               oparg = 1 << oparg;
+
+       if (! access_ok (VERIFY_WRITE, uaddr, sizeof(int)))
+               return -EFAULT;
+
+       ret = uaccess.futex_atomic_op(op, uaddr, oparg, &oldval);
+
+       if (!ret) {
+               switch (cmp) {
+               case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break;
+               case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break;
+               case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break;
+               case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break;
+               case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break;
+               case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break;
+               default: ret = -ENOSYS;
+               }
+       }
+       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;
+
+       return uaccess.futex_atomic_cmpxchg(uaddr, oldval, newval);
+}
+
+#endif /* __KERNEL__ */
+#endif /* _ASM_S390_FUTEX_H */