--- zzzz-none-000/linux-3.10.107/arch/x86/oprofile/backtrace.c	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/arch/x86/oprofile/backtrace.c	2021-02-04 17:41:59.000000000 +0000
@@ -47,7 +47,7 @@
 	unsigned long bytes;
 
 	bytes = copy_from_user_nmi(bufhead, head, sizeof(bufhead));
-	if (bytes != sizeof(bufhead))
+	if (bytes != 0)
 		return NULL;
 
 	fp = (struct stack_frame_ia32 *) compat_ptr(bufhead[0].next_frame);
@@ -93,7 +93,7 @@
 	unsigned long bytes;
 
 	bytes = copy_from_user_nmi(bufhead, head, sizeof(bufhead));
-	if (bytes != sizeof(bufhead))
+	if (bytes != 0)
 		return NULL;
 
 	oprofile_add_trace(bufhead[0].return_address);
@@ -111,7 +111,7 @@
 {
 	struct stack_frame *head = (struct stack_frame *)frame_pointer(regs);
 
-	if (!user_mode_vm(regs)) {
+	if (!user_mode(regs)) {
 		unsigned long stack = kernel_stack_pointer(regs);
 		if (depth)
 			dump_trace(NULL, regs, (unsigned long *)stack, 0,