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review.evervolv.com / android_kernel_oneplus_msm8996 / fc432e1952a3899ce35e84b417e5d60f74cb901b / . / include / asm-s390 / futex.h
blob: 5c5d02de49e9ae53fe5728fef181f1657fd4c3dc [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>
Heiko Carstensd8ad0752007-01-09 10:18:50 +0100[diff] [blame]7#include <linux/uaccess.h>
Martin Schwidefsky3363fbd2006-04-27 18:40:12 -0700[diff] [blame]8#include <asm/errno.h>
Martin Schwidefsky3363fbd2006-04-27 18:40:12 -0700[diff] [blame]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
Heiko Carstensd8ad0752007-01-09 10:18:50 +0100[diff] [blame]24 pagefault_disable();
Gerald Schaeferd02765d2006-09-20 15:59:42 +0200[diff] [blame]25 ret = uaccess.futex_atomic_op(op, uaddr, oparg, &oldval);
Heiko Carstensd8ad0752007-01-09 10:18:50 +0100[diff] [blame]26 pagefault_enable();
Martin Schwidefsky3363fbd2006-04-27 18:40:12 -0700[diff] [blame]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
Gerald Schaeferd02765d2006-09-20 15:59:42 +0200[diff] [blame]42static inline int futex_atomic_cmpxchg_inatomic(int __user *uaddr,
43 int oldval, int newval)
Martin Schwidefsky3363fbd2006-04-27 18:40:12 -0700[diff] [blame]44{
Martin Schwidefsky3363fbd2006-04-27 18:40:12 -0700[diff] [blame]45 if (! access_ok (VERIFY_WRITE, uaddr, sizeof(int)))
46 return -EFAULT;
Gerald Schaeferd02765d2006-09-20 15:59:42 +0200[diff] [blame]47
48 return uaccess.futex_atomic_cmpxchg(uaddr, oldval, newval);
Martin Schwidefsky3363fbd2006-04-27 18:40:12 -0700[diff] [blame]49}
50
51#endif /* __KERNEL__ */
52#endif /* _ASM_S390_FUTEX_H */