2 files changed, 94 insertions, 1 deletions

diff --git a/arch/m68k/include/asm/Kbuild b/arch/m68k/include/asm/Kbuild
index c7933e41f10d..09d77a862da3 100644
--- a/arch/m68k/include/asm/Kbuild
+++ b/arch/m68k/include/asm/Kbuild
@@ -6,7 +6,6 @@ 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
diff --git a/arch/m68k/include/asm/futex.h b/arch/m68k/include/asm/futex.h
new file mode 100644
index 000000000000..bc868af10c96
--- /dev/null
+++ b/arch/m68k/include/asm/futex.h
@@ -0,0 +1,94 @@
+#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 */