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| author | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2017-07-11 19:21:04 -0400 |
|---|---|---|
| committer | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2017-07-11 19:21:04 -0400 |
| commit | bbd1d27d863d5c0acee65ecd0c2e34035e1df5ea (patch) | |
| tree | 51b0930471b32f25996e5968b4cfc2428d3cd00a /kernel | |
| parent | dc8d387210e3e2ab294031e8f6542329bc9141c4 (diff) | |
| download | lwn-bbd1d27d863d5c0acee65ecd0c2e34035e1df5ea.tar.gz lwn-bbd1d27d863d5c0acee65ecd0c2e34035e1df5ea.zip | |
tracing: Do note expose stack_trace_filter without DYNAMIC_FTRACE
The "stack_trace_filter" file only makes sense if DYNAMIC_FTRACE is
configured in. If it is not, then the user can not filter any functions.
Not only that, the open function causes warnings when DYNAMIC_FTRACE is not
set.
Link: http://lkml.kernel.org/r/20170710110521.600806-1-arnd@arndb.de
Reported-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/trace/trace_stack.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/kernel/trace/trace_stack.c b/kernel/trace/trace_stack.c index b4a751e8f9d6..a4df67cbc711 100644 --- a/kernel/trace/trace_stack.c +++ b/kernel/trace/trace_stack.c @@ -406,6 +406,8 @@ static const struct file_operations stack_trace_fops = { .release = seq_release, }; +#ifdef CONFIG_DYNAMIC_FTRACE + static int stack_trace_filter_open(struct inode *inode, struct file *file) { @@ -423,6 +425,8 @@ static const struct file_operations stack_trace_filter_fops = { .release = ftrace_regex_release, }; +#endif /* CONFIG_DYNAMIC_FTRACE */ + int stack_trace_sysctl(struct ctl_table *table, int write, void __user *buffer, size_t *lenp, @@ -477,8 +481,10 @@ static __init int stack_trace_init(void) trace_create_file("stack_trace", 0444, d_tracer, NULL, &stack_trace_fops); +#ifdef CONFIG_DYNAMIC_FTRACE trace_create_file("stack_trace_filter", 0444, d_tracer, &trace_ops, &stack_trace_filter_fops); +#endif if (stack_trace_filter_buf[0]) ftrace_set_early_filter(&trace_ops, stack_trace_filter_buf, 1); |