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parisc: Update futex.h to match generic implementation 

The attached patch updates the parisc version of futex.h to match the
current generic implementation except for the spinlock code.

Signed-off-by: John David Anglin <dave.anglin@bell.net>
Signed-off-by: Helge Deller <deller@gmx.de>
This commit is contained in:
John David Anglin 2016-05-21 15:03:54 -04:00 committed by Helge Deller
parent 4df3c9ec12
commit 99aed91a8d
1 changed files with 30 additions and 42 deletions
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72
arch/parisc/include/asm/futex.h
View File

@ -35,70 +35,57 @@ static inline int
futex_atomic_op_inuser (int encoded_op, u32 __user *uaddr)
{
unsigned long int flags;
u32 val;
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 = 0, ret;
int oldval, ret;
u32 tmp;
if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
oparg = 1 << oparg;
if (!access_ok(VERIFY_WRITE, uaddr, sizeof(*uaddr)))
return -EFAULT;
_futex_spin_lock_irqsave(uaddr, &flags);
pagefault_disable();
_futex_spin_lock_irqsave(uaddr, &flags);
ret = -EFAULT;
if (unlikely(get_user(oldval, uaddr) != 0))
goto out_pagefault_enable;
ret = 0;
tmp = oldval;
switch (op) {
case FUTEX_OP_SET:
/* *(int *)UADDR2 = OPARG; */
ret = get_user(oldval, uaddr);
if (!ret)
ret = put_user(oparg, uaddr);
tmp = oparg;
break;
case FUTEX_OP_ADD:
/* *(int *)UADDR2 += OPARG; */
ret = get_user(oldval, uaddr);
if (!ret) {
val = oldval + oparg;
ret = put_user(val, uaddr);
}
tmp += oparg;
break;
case FUTEX_OP_OR:
/* *(int *)UADDR2 |= OPARG; */
ret = get_user(oldval, uaddr);
if (!ret) {
val = oldval | oparg;
ret = put_user(val, uaddr);
}
tmp |= oparg;
break;
case FUTEX_OP_ANDN:
/* *(int *)UADDR2 &= ~OPARG; */
ret = get_user(oldval, uaddr);
if (!ret) {
val = oldval & ~oparg;
ret = put_user(val, uaddr);
}
tmp &= ~oparg;
break;
case FUTEX_OP_XOR:
/* *(int *)UADDR2 ^= OPARG; */
ret = get_user(oldval, uaddr);
if (!ret) {
val = oldval ^ oparg;
ret = put_user(val, uaddr);
}
tmp ^= oparg;
break;
default:
ret = -ENOSYS;
}
if (ret == 0 && unlikely(put_user(tmp, uaddr) != 0))
ret = -EFAULT;
out_pagefault_enable:
pagefault_enable();
_futex_spin_unlock_irqrestore(uaddr, &flags);
pagefault_enable();
if (!ret) {
if (ret == 0) {
switch (cmp) {
case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break;
case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break;
@ -112,12 +99,10 @@ futex_atomic_op_inuser (int encoded_op, u32 __user *uaddr)
return ret;
}
/* Non-atomic version */
static inline int
futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
u32 oldval, u32 newval)
{
int ret;
u32 val;
unsigned long flags;
@ -137,17 +122,20 @@ futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
*/
_futex_spin_lock_irqsave(uaddr, &flags);
if (unlikely(get_user(val, uaddr) != 0)) {
_futex_spin_unlock_irqrestore(uaddr, &flags);
return -EFAULT;
}
ret = get_user(val, uaddr);
if (!ret && val == oldval)
ret = put_user(newval, uaddr);
if (val == oldval && unlikely(put_user(newval, uaddr) != 0)) {
_futex_spin_unlock_irqrestore(uaddr, &flags);
return -EFAULT;
}
*uval = val;
_futex_spin_unlock_irqrestore(uaddr, &flags);
return ret;
return 0;
}
#endif /*__KERNEL__*/