@@ -10632,17 +10658,23 @@ static __init void create_trace_instances(struct dentry *d_tracer)
 static void
 init_tracer_tracefs(struct trace_array *tr, struct dentry *d_tracer)
 {
+	umode_t writable_mode = TRACE_MODE_WRITE;
+	bool readonly = trace_array_is_readonly(tr);
 	int cpu;
 
+	if (readonly)
+		writable_mode = TRACE_MODE_READ;
+
 	trace_create_file("available_tracers", TRACE_MODE_READ, d_tracer,
-			tr, &show_traces_fops);
+			  tr, &show_traces_fops);
 
-	trace_create_file("current_tracer", TRACE_MODE_WRITE, d_tracer,
-			tr, &set_tracer_fops);
+	trace_create_file("current_tracer", writable_mode, d_tracer,
+			  tr, &set_tracer_fops);
 
-	trace_create_file("tracing_cpumask", TRACE_MODE_WRITE, d_tracer,
+	trace_create_file("tracing_cpumask", writable_mode, d_tracer,
 			  tr, &tracing_cpumask_fops);
 
+	/* Options are used for changing print-format even for readonly instance. */
 	trace_create_file("trace_options", TRACE_MODE_WRITE, d_tracer,
 			  tr, &tracing_iter_fops);
 

@@ -10652,27 +10684,35 @@ init_tracer_tracefs(struct trace_array *tr, struct dentry *d_tracer)
 	trace_create_file("trace_pipe", TRACE_MODE_READ, d_tracer,
 			  tr, &tracing_pipe_fops);
 
-	trace_create_file("buffer_size_kb", TRACE_MODE_WRITE, d_tracer,
+	trace_create_file("buffer_size_kb", writable_mode, d_tracer,
 			  tr, &tracing_entries_fops);
 
 	trace_create_file("buffer_total_size_kb", TRACE_MODE_READ, d_tracer,
 			  tr, &tracing_total_entries_fops);
 
-	trace_create_file("free_buffer", 0200, d_tracer,
-			  tr, &tracing_free_buffer_fops);
+	if (!readonly) {
+		trace_create_file("free_buffer", 0200, d_tracer,
+				tr, &tracing_free_buffer_fops);

 
 	trace_create_file("timestamp_mode", TRACE_MODE_READ, d_tracer, tr,

@@ -10680,41 +10720,38 @@ init_tracer_tracefs(struct trace_array *tr, struct dentry *d_tracer)
 
 	tr->buffer_percent = 50;
 
-	trace_create_file("buffer_percent", TRACE_MODE_WRITE, d_tracer,
-			tr, &buffer_percent_fops);
-
-	trace_create_file("buffer_subbuf_size_kb", TRACE_MODE_WRITE, d_tracer,
+	trace_create_file("buffer_subbuf_size_kb", writable_mode, d_tracer,
 			  tr, &buffer_subbuf_size_fops);
 
-	trace_create_file("syscall_user_buf_size", TRACE_MODE_WRITE, d_tracer,
-			 tr, &tracing_syscall_buf_fops);
-
 	create_trace_options_dir(tr);
 
 #ifdef CONFIG_TRACER_MAX_TRACE
-	trace_create_maxlat_file(tr, d_tracer);
+	if (!readonly)
+		trace_create_maxlat_file(tr, d_tracer);
 #endif
 
-	if (ftrace_create_function_files(tr, d_tracer))
+	if (!readonly && ftrace_create_function_files(tr, d_tracer))
 		MEM_FAIL(1, "Could not allocate function filter files");
 
 	if (tr->range_addr_start) {
 		trace_create_file("last_boot_info", TRACE_MODE_READ, d_tracer,
 				  tr, &last_boot_fops);
 #ifdef CONFIG_TRACER_SNAPSHOT
-	} else {
+	} else if (!readonly) {
 		trace_create_file("snapshot", TRACE_MODE_WRITE, d_tracer,
 				  tr, &snapshot_fops);
 #endif
 	}
 
-	trace_create_file("error_log", TRACE_MODE_WRITE, d_tracer,
-			  tr, &tracing_err_log_fops);
+	if (!readonly)
+		trace_create_file("error_log", TRACE_MODE_WRITE, d_tracer,
+				  tr, &tracing_err_log_fops);

 }
 
 #ifdef CONFIG_TRACEFS_AUTOMOUNT_DEPRECATED

diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 69e7defba6c6..0adc644084bf 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h

@@ -33,6 +33,7 @@
 
 #define TRACE_MODE_WRITE	0640
 #define TRACE_MODE_READ		0440
+#define TRACE_MODE_WRITE_MASK	(TRACE_MODE_WRITE & ~TRACE_MODE_READ)
 
 enum trace_type {
 	__TRACE_FIRST_TYPE = 0,

@@ -483,6 +484,12 @@ extern bool trace_clock_in_ns(struct trace_array *tr);
 
 extern unsigned long trace_adjust_address(struct trace_array *tr, unsigned long addr);
 
+static inline bool trace_array_is_readonly(struct trace_array *tr)
+{
+	/* backup instance is read only. */
+	return tr->flags & TRACE_ARRAY_FL_VMALLOC;

+}
+
 /*
  * The global tracer (top) should be the first trace array added,
  * but we check the flag anyway.

@@ -681,7 +688,6 @@ struct dentry *trace_create_file(const char *name,
 				 void *data,
 				 const struct file_operations *fops);
 
-
 /**
  * tracer_tracing_is_on_cpu - show real state of ring buffer enabled on for a cpu
  * @tr : the trace array to know if ring buffer is enabled

diff --git a/kernel/trace/trace_boot.c b/kernel/trace/trace_boot.c
index dbe29b4c6a7a..2ca2541c8a58 100644
--- a/kernel/trace/trace_boot.c
+++ b/kernel/trace/trace_boot.c

@@ -61,7 +61,8 @@ trace_boot_set_instance_options(struct trace_array *tr, struct xbc_node *node)
 		v = memparse(p, NULL);
 		if (v < PAGE_SIZE)
 			pr_err("Buffer size is too small: %s\n", p);
-		if (tracing_resize_ring_buffer(tr, v, RING_BUFFER_ALL_CPUS) < 0)
+		if (trace_array_is_readonly(tr) ||
+		    tracing_resize_ring_buffer(tr, v, RING_BUFFER_ALL_CPUS) < 0)
 			pr_err("Failed to resize trace buffer to %s\n", p);
 	}
 

@@ -597,7 +598,7 @@ trace_boot_enable_tracer(struct trace_array *tr, struct xbc_node *node)
 
 	p = xbc_node_find_value(node, "tracer", NULL);
 	if (p && *p != '\0') {
-		if (tracing_set_tracer(tr, p) < 0)
+		if (trace_array_is_readonly(tr) || tracing_set_tracer(tr, p) < 0)
 			pr_err("Failed to set given tracer: %s\n", p);
 	}