1 #ifndef _ASM_S390_FUTEX_H 2 #define _ASM_S390_FUTEX_H 3 4 #include <linux/futex.h> 5 #include <linux/uaccess.h> 6 #include <asm/errno.h> 7 8 static inline int futex_atomic_op_inuser (int encoded_op, u32 __user *uaddr) 9 { 10 int op = (encoded_op >> 28) & 7; 11 int cmp = (encoded_op >> 24) & 15; 12 int oparg = (encoded_op << 8) >> 20; 13 int cmparg = (encoded_op << 20) >> 20; 14 int oldval, ret; 15 16 if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28)) 17 oparg = 1 << oparg; 18 19 pagefault_disable(); 20 ret = uaccess.futex_atomic_op(op, uaddr, oparg, &oldval); 21 pagefault_enable(); 22 23 if (!ret) { 24 switch (cmp) { 25 case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break; 26 case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break; 27 case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break; 28 case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break; 29 case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break; 30 case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break; 31 default: ret = -ENOSYS; 32 } 33 } 34 return ret; 35 } 36 37 static inline int futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr, 38 u32 oldval, u32 newval) 39 { 40 return uaccess.futex_atomic_cmpxchg(uval, uaddr, oldval, newval); 41 } 42 43 #endif /* _ASM_S390_FUTEX_H */ 44