trace: fix compiler warning in branch profiler
Impact: fix compiler warning
The ftrace_pointers used in the branch profiler are constant values.
They should never change. But the compiler complains when they are
passed into the debugfs_create_file as a data pointer, because the
function discards the qualifier.
This patch typecasts the parameter to debugfs_create_file back to
a void pointer. To remind the callbacks that they are pointing to
a constant value, I also modified the callback local pointers to
be const struct ftrace_pointer * as well.
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/kernel/trace/trace_branch.c b/kernel/trace/trace_branch.c
index 85792ae..877ee88 100644
--- a/kernel/trace/trace_branch.c
+++ b/kernel/trace/trace_branch.c
@@ -191,7 +191,7 @@
static void *
t_next(struct seq_file *m, void *v, loff_t *pos)
{
- struct ftrace_pointer *f = m->private;
+ const struct ftrace_pointer *f = m->private;
struct ftrace_branch_data *p = v;
(*pos)++;
@@ -224,7 +224,7 @@
static int t_show(struct seq_file *m, void *v)
{
- struct ftrace_pointer *fp = m->private;
+ const struct ftrace_pointer *fp = m->private;
struct ftrace_branch_data *p = v;
const char *f;
long percent;
@@ -296,7 +296,7 @@
extern unsigned long __start_branch_profile[];
extern unsigned long __stop_branch_profile[];
-static struct ftrace_pointer ftrace_branch_pos = {
+static const struct ftrace_pointer ftrace_branch_pos = {
.start = __start_branch_profile,
.stop = __stop_branch_profile,
.hit = 1,
@@ -320,7 +320,7 @@
d_tracer = tracing_init_dentry();
entry = debugfs_create_file("profile_annotated_branch", 0444, d_tracer,
- &ftrace_annotated_branch_pos,
+ (void *)&ftrace_annotated_branch_pos,
&tracing_branch_fops);
if (!entry)
pr_warning("Could not create debugfs "
@@ -328,7 +328,7 @@
#ifdef CONFIG_PROFILE_ALL_BRANCHES
entry = debugfs_create_file("profile_branch", 0444, d_tracer,
- &ftrace_branch_pos,
+ (void *)&ftrace_branch_pos,
&tracing_branch_fops);
if (!entry)
pr_warning("Could not create debugfs"