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gerrit-public.fairphone.software / kernel / msm-4.9 / 2dbb232c4d6b6c89fc367f7566c7c87dd3b56cd7 / . / include / asm-s390 / futex.h
blob: 5e261e1de6719bb99a638421e63eec8c02e5f79a [file] [log] [blame]
Martin Schwidefsky3363fbd2006-04-27 18:40:12 -0700[diff] [blame]1#ifndef _ASM_S390_FUTEX_H
2#define _ASM_S390_FUTEX_H
Jakub Jelinek4732efb2005-09-06 15:16:25 -0700[diff] [blame]3
Martin Schwidefsky3363fbd2006-04-27 18:40:12 -0700[diff] [blame]4#ifdef __KERNEL__
Jakub Jelinek4732efb2005-09-06 15:16:25 -0700[diff] [blame]5
Martin Schwidefsky3363fbd2006-04-27 18:40:12 -0700[diff] [blame]6#include <linux/futex.h>
7#include <asm/errno.h>
8#include <asm/uaccess.h>
9
Martin Schwidefsky3363fbd2006-04-27 18:40:12 -0700[diff] [blame]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;
Gerald Schaeferd02765d2006-09-20 15:59:42 +0200[diff] [blame]16 int oldval, ret;
17
Martin Schwidefsky3363fbd2006-04-27 18:40:12 -0700[diff] [blame]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
Gerald Schaeferd02765d2006-09-20 15:59:42 +0200[diff] [blame]24 ret = uaccess.futex_atomic_op(op, uaddr, oparg, &oldval);
Martin Schwidefsky3363fbd2006-04-27 18:40:12 -0700[diff] [blame]25
26 if (!ret) {
27 switch (cmp) {
28 case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break;
29 case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break;
30 case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break;
31 case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break;
32 case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break;
33 case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break;
34 default: ret = -ENOSYS;
35 }
36 }
37 return ret;
38}
39
Gerald Schaeferd02765d2006-09-20 15:59:42 +0200[diff] [blame]40static inline int futex_atomic_cmpxchg_inatomic(int __user *uaddr,
41 int oldval, int newval)
Martin Schwidefsky3363fbd2006-04-27 18:40:12 -0700[diff] [blame]42{
Martin Schwidefsky3363fbd2006-04-27 18:40:12 -0700[diff] [blame]43 if (! access_ok (VERIFY_WRITE, uaddr, sizeof(int)))
44 return -EFAULT;
Gerald Schaeferd02765d2006-09-20 15:59:42 +0200[diff] [blame]45
46 return uaccess.futex_atomic_cmpxchg(uaddr, oldval, newval);
Martin Schwidefsky3363fbd2006-04-27 18:40:12 -0700[diff] [blame]47}
48
49#endif /* __KERNEL__ */
50#endif /* _ASM_S390_FUTEX_H */