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futex.h

#ifndef _ASM_S390_FUTEX_H
#define _ASM_S390_FUTEX_H

#ifdef __KERNEL__

#include <linux/futex.h>
#include <linux/uaccess.h>
#include <asm/errno.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;

      pagefault_disable();
      ret = uaccess.futex_atomic_op(op, uaddr, oparg, &oldval);
      pagefault_enable();

      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 */

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