mirror of
https://github.com/tbsdtv/linux_media.git
synced 2025-07-23 12:43:29 +02:00
a08971e948
Move access_ok() in and pagefault_enable()/pagefault_disable() out. Mechanical conversion only - some instances don't really need a separate access_ok() at all (e.g. the ones only using get_user()/put_user(), or architectures where access_ok() is always true); we'll deal with that in followups. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
79 lines
1.4 KiB
C
79 lines
1.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef __ASM_SH_FUTEX_H
|
|
#define __ASM_SH_FUTEX_H
|
|
|
|
#ifdef __KERNEL__
|
|
|
|
#include <linux/futex.h>
|
|
#include <linux/uaccess.h>
|
|
#include <asm/errno.h>
|
|
|
|
#if !defined(CONFIG_SMP)
|
|
#include <asm/futex-irq.h>
|
|
#elif defined(CONFIG_CPU_J2)
|
|
#include <asm/futex-cas.h>
|
|
#elif defined(CONFIG_CPU_SH4A)
|
|
#include <asm/futex-llsc.h>
|
|
#else
|
|
#error SMP not supported on this configuration.
|
|
#endif
|
|
|
|
static inline int
|
|
futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
|
|
u32 oldval, u32 newval)
|
|
{
|
|
if (!access_ok(uaddr, sizeof(u32)))
|
|
return -EFAULT;
|
|
|
|
return atomic_futex_op_cmpxchg_inatomic(uval, uaddr, oldval, newval);
|
|
}
|
|
|
|
static inline int arch_futex_atomic_op_inuser(int op, u32 oparg, int *oval,
|
|
u32 __user *uaddr)
|
|
{
|
|
u32 oldval, newval, prev;
|
|
int ret;
|
|
|
|
if (!access_ok(uaddr, sizeof(u32)))
|
|
return -EFAULT;
|
|
|
|
do {
|
|
ret = get_user(oldval, uaddr);
|
|
|
|
if (ret) break;
|
|
|
|
switch (op) {
|
|
case FUTEX_OP_SET:
|
|
newval = oparg;
|
|
break;
|
|
case FUTEX_OP_ADD:
|
|
newval = oldval + oparg;
|
|
break;
|
|
case FUTEX_OP_OR:
|
|
newval = oldval | oparg;
|
|
break;
|
|
case FUTEX_OP_ANDN:
|
|
newval = oldval & ~oparg;
|
|
break;
|
|
case FUTEX_OP_XOR:
|
|
newval = oldval ^ oparg;
|
|
break;
|
|
default:
|
|
ret = -ENOSYS;
|
|
break;
|
|
}
|
|
|
|
if (ret) break;
|
|
|
|
ret = futex_atomic_cmpxchg_inatomic(&prev, uaddr, oldval, newval);
|
|
} while (!ret && prev != oldval);
|
|
|
|
if (!ret)
|
|
*oval = oldval;
|
|
|
|
return ret;
|
|
}
|
|
|
|
#endif /* __KERNEL__ */
|
|
#endif /* __ASM_SH_FUTEX_H */
|