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m68k: Switch to asm-generic/futex.h

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As of commit 00f634bc52 ("asm-generic: add generic futex for
!CONFIG_SMP") asm-generic follows the m68k futex implementation.

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
This commit is contained in:
Geert Uytterhoeven 2015-01-06 08:49:52 +01:00
parent a38eaa07a0
commit 8c0ce284b3
2 changed files with 1 additions and 94 deletions
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1
arch/m68k/include/asm/Kbuild
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@ -6,6 +6,7 @@ generic-y += device.h
generic-y += emergency-restart.h
generic-y += errno.h
generic-y += exec.h
generic-y += futex.h
generic-y += hw_irq.h
generic-y += ioctl.h
generic-y += ipcbuf.h

94
arch/m68k/include/asm/futex.h
View File

@ -1,94 +0,0 @@
#ifndef _ASM_M68K_FUTEX_H
#define _ASM_M68K_FUTEX_H
#ifdef __KERNEL__
#if !defined(CONFIG_MMU)
#include <asm-generic/futex.h>
#else /* CONFIG_MMU */
#include <linux/futex.h>
#include <linux/uaccess.h>
#include <asm/errno.h>
static inline int
futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
u32 oldval, u32 newval)
{
u32 val;
if (unlikely(get_user(val, uaddr) != 0))
return -EFAULT;
if (val == oldval && unlikely(put_user(newval, uaddr) != 0))
return -EFAULT;
*uval = val;
return 0;
}
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;
u32 tmp;
if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
oparg = 1 << oparg;
pagefault_disable(); /* implies preempt_disable() */
ret = -EFAULT;
if (unlikely(get_user(oldval, uaddr) != 0))
goto out_pagefault_enable;
ret = 0;
tmp = oldval;
switch (op) {
case FUTEX_OP_SET:
tmp = oparg;
break;
case FUTEX_OP_ADD:
tmp += oparg;
break;
case FUTEX_OP_OR:
tmp |= oparg;
break;
case FUTEX_OP_ANDN:
tmp &= ~oparg;
break;
case FUTEX_OP_XOR:
tmp ^= oparg;
break;
default:
ret = -ENOSYS;
}
if (ret == 0 && unlikely(put_user(tmp, uaddr) != 0))
ret = -EFAULT;
out_pagefault_enable:
pagefault_enable(); /* subsumes preempt_enable() */
if (ret == 0) {
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;
}
#endif /* CONFIG_MMU */
#endif /* __KERNEL__ */
#endif /* _ASM_M68K_FUTEX_H */