threeeye
bc1d038eac
Squashed backup commit (no shallow-clone history issues) of xiaomi-mt6833-dev/kernel_xiaomi_mt6833 (lineage-23.2 branch, upstream commit 9eece662e) plus all fixes applied to get everpal_defconfig building clean against a modern (GCC 15.2.0) toolchain -- see the previous commit message on the lineage-23.2 branch (also in this repo history is not available here since this is a squashed snapshot; full incremental history lives in the local DL380 checkout and the upstream GitHub remote). Upstream: https://github.com/xiaomi-mt6833-dev/kernel_xiaomi_mt6833 (lineage-23.2)
83 lines
1.5 KiB
C
83 lines
1.5 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(VERIFY_WRITE, 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;
|
|
|
|
pagefault_disable();
|
|
|
|
do {
|
|
if (op == FUTEX_OP_SET)
|
|
ret = oldval = 0;
|
|
else
|
|
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);
|
|
|
|
pagefault_enable();
|
|
|
|
if (!ret)
|
|
*oval = oldval;
|
|
|
|
return ret;
|
|
}
|
|
|
|
#endif /* __KERNEL__ */
|
|
#endif /* __ASM_SH_FUTEX_H */
|