arm64: fix USER_DS definition problem in non-compat mode

hulk inclusion
category: bugfix
bugzilla: 51788
CVE: NA

--------

For some platforms which CONFIG_COMPAT is not set, the function 'is_compat_task'
is not declared. Therefore, the macro USER_DS cannot be defined using the function
'is_compat_task' in this case.

Fixes: 2ef73d5148e3 ("arm64: fix current_thread_info()->addr_limit setup")
Signed-off-by: NChen Jiahao <chenjiahao16@huawei.com>
Reviewed-by: NChang Liao <liaochang1@huawei.com>
Signed-off-by: NChen Jun <chenjun102@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

arch/arm64/include/asm/processor.h

@@ -9,8 +9,12 @@
 #define __ASM_PROCESSOR_H
 
 #define KERNEL_DS		UL(-1)
+#ifdef CONFIG_COMPAT
 #define USER_DS			(is_compat_task() ? \
 				(UL(0x100000000) - 1) : (TASK_SIZE - 1))
+#else
+#define USER_DS			(TASK_SIZE - 1)
+#endif
 
 /*
  * On arm64 systems, unaligned accesses by the CPU are cheap, and so there is