diff --git a/kernel/trace/trace_output.c b/kernel/trace/trace_output.c
index 6595074..d72b9a6 100644
--- a/kernel/trace/trace_output.c
+++ b/kernel/trace/trace_output.c
@@ -137,7 +137,7 @@
 	return 1;
 }
 
-int trace_seq_putmem(struct trace_seq *s, void *mem, size_t len)
+int trace_seq_putmem(struct trace_seq *s, const void *mem, size_t len)
 {
 	if (len > ((PAGE_SIZE - 1) - s->len))
 		return 0;
@@ -148,10 +148,10 @@
 	return len;
 }
 
-int trace_seq_putmem_hex(struct trace_seq *s, void *mem, size_t len)
+int trace_seq_putmem_hex(struct trace_seq *s, const void *mem, size_t len)
 {
 	unsigned char hex[HEX_CHARS];
-	unsigned char *data = mem;
+	const unsigned char *data = mem;
 	int i, j;
 
 #ifdef __BIG_ENDIAN
diff --git a/kernel/trace/trace_output.h b/kernel/trace/trace_output.h
index 46fb961..e0bde39 100644
--- a/kernel/trace/trace_output.h
+++ b/kernel/trace/trace_output.h
@@ -31,8 +31,9 @@
 				 size_t cnt);
 extern int trace_seq_puts(struct trace_seq *s, const char *str);
 extern int trace_seq_putc(struct trace_seq *s, unsigned char c);
-extern int trace_seq_putmem(struct trace_seq *s, void *mem, size_t len);
-extern int trace_seq_putmem_hex(struct trace_seq *s, void *mem, size_t len);
+extern int trace_seq_putmem(struct trace_seq *s, const void *mem, size_t len);
+extern int trace_seq_putmem_hex(struct trace_seq *s, const void *mem,
+				size_t len);
 extern void *trace_seq_reserve(struct trace_seq *s, size_t len);
 extern int trace_seq_path(struct trace_seq *s, struct path *path);
 extern int seq_print_userip_objs(const struct userstack_entry *entry,