LXR linux/include/asm-s390/futex.h

   1#ifndef _ASM_S390_FUTEX_H
   2#define _ASM_S390_FUTEX_H
   3
   4#ifdef __KERNEL__
   5
   6#include <linux/futex.h>
   7#include <linux/uaccess.h>
   8#include <asm/errno.h>
   9
  10static inline int futex_atomic_op_inuser (int encoded_op, int __user *uaddr)
  11{
  12        int op = (encoded_op >> 28) & 7;
  13        int cmp = (encoded_op >> 24) & 15;
  14        int oparg = (encoded_op << 8) >> 20;
  15        int cmparg = (encoded_op << 20) >> 20;
  16        int oldval, ret;
  17
  18        if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
  19                oparg = 1 << oparg;
  20
  21        if (! access_ok (VERIFY_WRITE, uaddr, sizeof(int)))
  22                return -EFAULT;
  23
  24        pagefault_disable();
  25        ret = uaccess.futex_atomic_op(op, uaddr, oparg, &oldval);
  26        pagefault_enable();
  27
  28        if (!ret) {
  29                switch (cmp) {
  30                case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break;
  31                case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break;
  32                case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break;
  33                case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break;
  34                case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break;
  35                case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break;
  36                default: ret = -ENOSYS;
  37                }
  38        }
  39        return ret;
  40}
  41
  42static inline int futex_atomic_cmpxchg_inatomic(int __user *uaddr,
  43                                                int oldval, int newval)
  44{
  45        if (! access_ok (VERIFY_WRITE, uaddr, sizeof(int)))
  46                return -EFAULT;
  47
  48        return uaccess.futex_atomic_cmpxchg(uaddr, oldval, newval);
  49}
  50
  51#endif /* __KERNEL__ */
  52#endif /* _ASM_S390_FUTEX_H */
  53