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Filename/usr/src/linux-headers-3.13.0-24/arch/s390/include/asm/futex.h
Size1.15 kb
Permissionrw-r--r--
Ownerroot : root
Create time27-Apr-2025 09:50
Last modified20-Jan-2014 10:40
Last accessed07-Jul-2025 04:49
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#ifndef _ASM_S390_FUTEX_H
#define _ASM_S390_FUTEX_H

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

static inline int futex_atomic_op_inuser (int encoded_op, u32 __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;

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(u32 *uval, u32 __user *uaddr,
u32 oldval, u32 newval)
{
return uaccess.futex_atomic_cmpxchg(uval, uaddr, oldval, newval);
}

#endif /* _ASM_S390_FUTEX_H */