tracing/kprobes: Use dyn_event framework for kprobe events
Use dyn_event framework for kprobe events. This shows kprobe events on "tracing/dynamic_events" file. User can also define new events via tracing/dynamic_events. Link: http://lkml.kernel.org/r/154140855646.17322.6619219995865980392.stgit@devbox Reviewed-by: Tom Zanussi <tom.zanussi@linux.intel.com> Tested-by: Tom Zanussi <tom.zanussi@linux.intel.com> Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Masami Hiramatsu
Steven Rostedt (VMware)
parent
5448d44c38
commit
6212dd2968
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@ -20,6 +20,9 @@ current_tracer. Instead of that, add probe points via
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/sys/kernel/debug/tracing/kprobe_events, and enable it via
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/sys/kernel/debug/tracing/events/kprobes/<EVENT>/enable.
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You can also use /sys/kernel/debug/tracing/dynamic_events instead of
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kprobe_events. That interface will provide unified access to other
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dynamic events too.
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Synopsis of kprobe_events
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-------------------------
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@ -461,6 +461,7 @@ config KPROBE_EVENTS
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bool "Enable kprobes-based dynamic events"
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select TRACING
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select PROBE_EVENTS
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select DYNAMIC_EVENTS
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default y
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help
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This allows the user to add tracing events (similar to tracepoints)
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@ -12,6 +12,7 @@
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#include <linux/rculist.h>
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#include <linux/error-injection.h>
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#include "trace_dynevent.h"
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#include "trace_kprobe_selftest.h"
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#include "trace_probe.h"
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#include "trace_probe_tmpl.h"
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@ -19,17 +20,51 @@
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#define KPROBE_EVENT_SYSTEM "kprobes"
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#define KRETPROBE_MAXACTIVE_MAX 4096
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static int trace_kprobe_create(int argc, const char **argv);
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static int trace_kprobe_show(struct seq_file *m, struct dyn_event *ev);
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static int trace_kprobe_release(struct dyn_event *ev);
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static bool trace_kprobe_is_busy(struct dyn_event *ev);
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static bool trace_kprobe_match(const char *system, const char *event,
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struct dyn_event *ev);
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static struct dyn_event_operations trace_kprobe_ops = {
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.create = trace_kprobe_create,
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.show = trace_kprobe_show,
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.is_busy = trace_kprobe_is_busy,
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.free = trace_kprobe_release,
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.match = trace_kprobe_match,
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};
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/**
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* Kprobe event core functions
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*/
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struct trace_kprobe {
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struct list_head list;
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struct dyn_event devent;
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struct kretprobe rp; /* Use rp.kp for kprobe use */
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unsigned long __percpu *nhit;
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const char *symbol; /* symbol name */
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struct trace_probe tp;
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};
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static bool is_trace_kprobe(struct dyn_event *ev)
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{
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return ev->ops == &trace_kprobe_ops;
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}
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static struct trace_kprobe *to_trace_kprobe(struct dyn_event *ev)
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{
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return container_of(ev, struct trace_kprobe, devent);
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}
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/**
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* for_each_trace_kprobe - iterate over the trace_kprobe list
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* @pos: the struct trace_kprobe * for each entry
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* @dpos: the struct dyn_event * to use as a loop cursor
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*/
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#define for_each_trace_kprobe(pos, dpos) \
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for_each_dyn_event(dpos) \
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if (is_trace_kprobe(dpos) && (pos = to_trace_kprobe(dpos)))
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#define SIZEOF_TRACE_KPROBE(n) \
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(offsetof(struct trace_kprobe, tp.args) + \
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(sizeof(struct probe_arg) * (n)))
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@ -81,6 +116,22 @@ static nokprobe_inline bool trace_kprobe_module_exist(struct trace_kprobe *tk)
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return ret;
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}
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static bool trace_kprobe_is_busy(struct dyn_event *ev)
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{
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struct trace_kprobe *tk = to_trace_kprobe(ev);
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return trace_probe_is_enabled(&tk->tp);
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}
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static bool trace_kprobe_match(const char *system, const char *event,
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struct dyn_event *ev)
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{
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struct trace_kprobe *tk = to_trace_kprobe(ev);
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return strcmp(trace_event_name(&tk->tp.call), event) == 0 &&
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(!system || strcmp(tk->tp.call.class->system, system) == 0);
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}
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static nokprobe_inline unsigned long trace_kprobe_nhit(struct trace_kprobe *tk)
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{
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unsigned long nhit = 0;
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@ -128,9 +179,6 @@ bool trace_kprobe_error_injectable(struct trace_event_call *call)
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static int register_kprobe_event(struct trace_kprobe *tk);
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static int unregister_kprobe_event(struct trace_kprobe *tk);
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static DEFINE_MUTEX(probe_lock);
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static LIST_HEAD(probe_list);
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static int kprobe_dispatcher(struct kprobe *kp, struct pt_regs *regs);
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static int kretprobe_dispatcher(struct kretprobe_instance *ri,
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struct pt_regs *regs);
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@ -192,7 +240,7 @@ static struct trace_kprobe *alloc_trace_kprobe(const char *group,
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if (!tk->tp.class.system)
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goto error;
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INIT_LIST_HEAD(&tk->list);
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dyn_event_init(&tk->devent, &trace_kprobe_ops);
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INIT_LIST_HEAD(&tk->tp.files);
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return tk;
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error:
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@ -207,6 +255,9 @@ static void free_trace_kprobe(struct trace_kprobe *tk)
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{
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int i;
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if (!tk)
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return;
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for (i = 0; i < tk->tp.nr_args; i++)
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traceprobe_free_probe_arg(&tk->tp.args[i]);
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@ -220,9 +271,10 @@ static void free_trace_kprobe(struct trace_kprobe *tk)
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static struct trace_kprobe *find_trace_kprobe(const char *event,
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const char *group)
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{
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struct dyn_event *pos;
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struct trace_kprobe *tk;
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list_for_each_entry(tk, &probe_list, list)
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for_each_trace_kprobe(tk, pos)
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if (strcmp(trace_event_name(&tk->tp.call), event) == 0 &&
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strcmp(tk->tp.call.class->system, group) == 0)
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return tk;
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@ -321,7 +373,7 @@ disable_trace_kprobe(struct trace_kprobe *tk, struct trace_event_file *file)
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* created with perf_event_open. We don't need to wait for these
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* trace_kprobes
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*/
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if (list_empty(&tk->list))
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if (list_empty(&tk->devent.list))
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wait = 0;
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out:
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if (wait) {
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@ -419,7 +471,7 @@ static void __unregister_trace_kprobe(struct trace_kprobe *tk)
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}
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}
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/* Unregister a trace_probe and probe_event: call with locking probe_lock */
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/* Unregister a trace_probe and probe_event */
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static int unregister_trace_kprobe(struct trace_kprobe *tk)
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{
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/* Enabled event can not be unregistered */
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@ -431,7 +483,7 @@ static int unregister_trace_kprobe(struct trace_kprobe *tk)
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return -EBUSY;
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__unregister_trace_kprobe(tk);
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list_del(&tk->list);
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dyn_event_remove(&tk->devent);
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return 0;
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}
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@ -442,7 +494,7 @@ static int register_trace_kprobe(struct trace_kprobe *tk)
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struct trace_kprobe *old_tk;
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int ret;
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mutex_lock(&probe_lock);
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mutex_lock(&event_mutex);
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/* Delete old (same name) event if exist */
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old_tk = find_trace_kprobe(trace_event_name(&tk->tp.call),
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@ -471,10 +523,10 @@ static int register_trace_kprobe(struct trace_kprobe *tk)
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if (ret < 0)
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unregister_kprobe_event(tk);
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else
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list_add_tail(&tk->list, &probe_list);
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dyn_event_add(&tk->devent);
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end:
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mutex_unlock(&probe_lock);
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mutex_unlock(&event_mutex);
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return ret;
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}
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@ -483,6 +535,7 @@ static int trace_kprobe_module_callback(struct notifier_block *nb,
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unsigned long val, void *data)
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{
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struct module *mod = data;
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struct dyn_event *pos;
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struct trace_kprobe *tk;
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int ret;
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@ -490,8 +543,8 @@ static int trace_kprobe_module_callback(struct notifier_block *nb,
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return NOTIFY_DONE;
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/* Update probes on coming module */
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mutex_lock(&probe_lock);
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list_for_each_entry(tk, &probe_list, list) {
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mutex_lock(&event_mutex);
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for_each_trace_kprobe(tk, pos) {
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if (trace_kprobe_within_module(tk, mod)) {
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/* Don't need to check busy - this should have gone. */
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__unregister_trace_kprobe(tk);
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@ -502,7 +555,7 @@ static int trace_kprobe_module_callback(struct notifier_block *nb,
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mod->name, ret);
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}
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}
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mutex_unlock(&probe_lock);
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mutex_unlock(&event_mutex);
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return NOTIFY_DONE;
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}
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@ -520,7 +573,7 @@ static inline void sanitize_event_name(char *name)
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*name = '_';
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}
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static int create_trace_kprobe(int argc, char **argv)
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static int trace_kprobe_create(int argc, const char *argv[])
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{
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/*
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* Argument syntax:
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@ -544,9 +597,10 @@ static int create_trace_kprobe(int argc, char **argv)
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* FETCHARG:TYPE : use TYPE instead of unsigned long.
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*/
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struct trace_kprobe *tk;
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int i, ret = 0;
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bool is_return = false, is_delete = false;
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char *symbol = NULL, *event = NULL, *group = NULL;
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int i, len, ret = 0;
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bool is_return = false;
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char *symbol = NULL, *tmp = NULL;
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const char *event = NULL, *group = KPROBE_EVENT_SYSTEM;
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int maxactive = 0;
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long offset = 0;
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void *addr = NULL;
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@ -554,26 +608,26 @@ static int create_trace_kprobe(int argc, char **argv)
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unsigned int flags = TPARG_FL_KERNEL;
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/* argc must be >= 1 */
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if (argv[0][0] == 'p')
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is_return = false;
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else if (argv[0][0] == 'r') {
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if (argv[0][0] == 'r') {
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is_return = true;
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flags |= TPARG_FL_RETURN;
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} else if (argv[0][0] == '-')
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is_delete = true;
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else {
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pr_info("Probe definition must be started with 'p', 'r' or"
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" '-'.\n");
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return -EINVAL;
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}
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} else if (argv[0][0] != 'p' || argc < 2)
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return -ECANCELED;
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event = strchr(&argv[0][1], ':');
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if (event) {
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event[0] = '\0';
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if (event)
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event++;
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}
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if (is_return && isdigit(argv[0][1])) {
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ret = kstrtouint(&argv[0][1], 0, &maxactive);
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if (event)
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len = event - &argv[0][1] - 1;
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else
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len = strlen(&argv[0][1]);
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if (len > MAX_EVENT_NAME_LEN - 1)
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return -E2BIG;
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memcpy(buf, &argv[0][1], len);
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buf[len] = '\0';
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ret = kstrtouint(buf, 0, &maxactive);
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if (ret) {
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pr_info("Failed to parse maxactive.\n");
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return ret;
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@ -588,74 +642,37 @@ static int create_trace_kprobe(int argc, char **argv)
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}
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}
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if (event) {
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char *slash;
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slash = strchr(event, '/');
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if (slash) {
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group = event;
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event = slash + 1;
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slash[0] = '\0';
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if (strlen(group) == 0) {
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pr_info("Group name is not specified\n");
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return -EINVAL;
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}
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}
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if (strlen(event) == 0) {
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pr_info("Event name is not specified\n");
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return -EINVAL;
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}
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}
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if (!group)
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group = KPROBE_EVENT_SYSTEM;
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if (is_delete) {
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if (!event) {
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pr_info("Delete command needs an event name.\n");
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return -EINVAL;
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}
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mutex_lock(&probe_lock);
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tk = find_trace_kprobe(event, group);
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if (!tk) {
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mutex_unlock(&probe_lock);
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pr_info("Event %s/%s doesn't exist.\n", group, event);
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return -ENOENT;
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}
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/* delete an event */
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ret = unregister_trace_kprobe(tk);
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if (ret == 0)
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free_trace_kprobe(tk);
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mutex_unlock(&probe_lock);
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return ret;
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}
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if (argc < 2) {
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pr_info("Probe point is not specified.\n");
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return -EINVAL;
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}
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/* try to parse an address. if that fails, try to read the
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* input as a symbol. */
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if (kstrtoul(argv[1], 0, (unsigned long *)&addr)) {
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/* Check whether uprobe event specified */
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if (strchr(argv[1], '/') && strchr(argv[1], ':'))
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return -ECANCELED;
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/* a symbol specified */
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symbol = argv[1];
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symbol = kstrdup(argv[1], GFP_KERNEL);
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if (!symbol)
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return -ENOMEM;
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/* TODO: support .init module functions */
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ret = traceprobe_split_symbol_offset(symbol, &offset);
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if (ret || offset < 0 || offset > UINT_MAX) {
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pr_info("Failed to parse either an address or a symbol.\n");
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return ret;
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goto out;
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}
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if (kprobe_on_func_entry(NULL, symbol, offset))
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flags |= TPARG_FL_FENTRY;
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if (offset && is_return && !(flags & TPARG_FL_FENTRY)) {
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pr_info("Given offset is not valid for return probe.\n");
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return -EINVAL;
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ret = -EINVAL;
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goto out;
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}
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}
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argc -= 2; argv += 2;
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/* setup a probe */
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if (!event) {
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if (event) {
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ret = traceprobe_parse_event_name(&event, &group, buf);
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if (ret)
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goto out;
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} else {
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/* Make a new event name */
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if (symbol)
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snprintf(buf, MAX_EVENT_NAME_LEN, "%c_%s_%ld",
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@ -666,17 +683,27 @@ static int create_trace_kprobe(int argc, char **argv)
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sanitize_event_name(buf);
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event = buf;
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}
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/* setup a probe */
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tk = alloc_trace_kprobe(group, event, addr, symbol, offset, maxactive,
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argc, is_return);
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if (IS_ERR(tk)) {
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pr_info("Failed to allocate trace_probe.(%d)\n",
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(int)PTR_ERR(tk));
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return PTR_ERR(tk);
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ret = PTR_ERR(tk);
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goto out;
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}
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/* parse arguments */
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for (i = 0; i < argc && i < MAX_TRACE_ARGS; i++) {
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ret = traceprobe_parse_probe_arg(&tk->tp, i, argv[i], flags);
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tmp = kstrdup(argv[i], GFP_KERNEL);
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if (!tmp) {
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ret = -ENOMEM;
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goto error;
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}
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ret = traceprobe_parse_probe_arg(&tk->tp, i, tmp, flags);
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kfree(tmp);
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if (ret)
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goto error;
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}
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@ -684,60 +711,39 @@ static int create_trace_kprobe(int argc, char **argv)
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ret = register_trace_kprobe(tk);
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if (ret)
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goto error;
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return 0;
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out:
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kfree(symbol);
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return ret;
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error:
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free_trace_kprobe(tk);
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return ret;
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goto out;
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}
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static int release_all_trace_kprobes(void)
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static int create_or_delete_trace_kprobe(int argc, char **argv)
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{
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struct trace_kprobe *tk;
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int ret = 0;
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int ret;
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mutex_lock(&probe_lock);
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/* Ensure no probe is in use. */
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list_for_each_entry(tk, &probe_list, list)
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if (trace_probe_is_enabled(&tk->tp)) {
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ret = -EBUSY;
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goto end;
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}
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/* TODO: Use batch unregistration */
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while (!list_empty(&probe_list)) {
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tk = list_entry(probe_list.next, struct trace_kprobe, list);
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ret = unregister_trace_kprobe(tk);
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if (ret)
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goto end;
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if (argv[0][0] == '-')
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return dyn_event_release(argc, argv, &trace_kprobe_ops);
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ret = trace_kprobe_create(argc, (const char **)argv);
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return ret == -ECANCELED ? -EINVAL : ret;
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}
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static int trace_kprobe_release(struct dyn_event *ev)
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{
|
||||
struct trace_kprobe *tk = to_trace_kprobe(ev);
|
||||
int ret = unregister_trace_kprobe(tk);
|
||||
|
||||
if (!ret)
|
||||
free_trace_kprobe(tk);
|
||||
}
|
||||
|
||||
end:
|
||||
mutex_unlock(&probe_lock);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
/* Probes listing interfaces */
|
||||
static void *probes_seq_start(struct seq_file *m, loff_t *pos)
|
||||
static int trace_kprobe_show(struct seq_file *m, struct dyn_event *ev)
|
||||
{
|
||||
mutex_lock(&probe_lock);
|
||||
return seq_list_start(&probe_list, *pos);
|
||||
}
|
||||
|
||||
static void *probes_seq_next(struct seq_file *m, void *v, loff_t *pos)
|
||||
{
|
||||
return seq_list_next(v, &probe_list, pos);
|
||||
}
|
||||
|
||||
static void probes_seq_stop(struct seq_file *m, void *v)
|
||||
{
|
||||
mutex_unlock(&probe_lock);
|
||||
}
|
||||
|
||||
static int probes_seq_show(struct seq_file *m, void *v)
|
||||
{
|
||||
struct trace_kprobe *tk = v;
|
||||
struct trace_kprobe *tk = to_trace_kprobe(ev);
|
||||
int i;
|
||||
|
||||
seq_putc(m, trace_kprobe_is_return(tk) ? 'r' : 'p');
|
||||
|
|
@ -759,10 +765,20 @@ static int probes_seq_show(struct seq_file *m, void *v)
|
|||
return 0;
|
||||
}
|
||||
|
||||
static int probes_seq_show(struct seq_file *m, void *v)
|
||||
{
|
||||
struct dyn_event *ev = v;
|
||||
|
||||
if (!is_trace_kprobe(ev))
|
||||
return 0;
|
||||
|
||||
return trace_kprobe_show(m, ev);
|
||||
}
|
||||
|
||||
static const struct seq_operations probes_seq_op = {
|
||||
.start = probes_seq_start,
|
||||
.next = probes_seq_next,
|
||||
.stop = probes_seq_stop,
|
||||
.start = dyn_event_seq_start,
|
||||
.next = dyn_event_seq_next,
|
||||
.stop = dyn_event_seq_stop,
|
||||
.show = probes_seq_show
|
||||
};
|
||||
|
||||
|
|
@ -771,7 +787,7 @@ static int probes_open(struct inode *inode, struct file *file)
|
|||
int ret;
|
||||
|
||||
if ((file->f_mode & FMODE_WRITE) && (file->f_flags & O_TRUNC)) {
|
||||
ret = release_all_trace_kprobes();
|
||||
ret = dyn_events_release_all(&trace_kprobe_ops);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
}
|
||||
|
|
@ -783,7 +799,7 @@ static ssize_t probes_write(struct file *file, const char __user *buffer,
|
|||
size_t count, loff_t *ppos)
|
||||
{
|
||||
return trace_parse_run_command(file, buffer, count, ppos,
|
||||
create_trace_kprobe);
|
||||
create_or_delete_trace_kprobe);
|
||||
}
|
||||
|
||||
static const struct file_operations kprobe_events_ops = {
|
||||
|
|
@ -798,8 +814,13 @@ static const struct file_operations kprobe_events_ops = {
|
|||
/* Probes profiling interfaces */
|
||||
static int probes_profile_seq_show(struct seq_file *m, void *v)
|
||||
{
|
||||
struct trace_kprobe *tk = v;
|
||||
struct dyn_event *ev = v;
|
||||
struct trace_kprobe *tk;
|
||||
|
||||
if (!is_trace_kprobe(ev))
|
||||
return 0;
|
||||
|
||||
tk = to_trace_kprobe(ev);
|
||||
seq_printf(m, " %-44s %15lu %15lu\n",
|
||||
trace_event_name(&tk->tp.call),
|
||||
trace_kprobe_nhit(tk),
|
||||
|
|
@ -809,9 +830,9 @@ static int probes_profile_seq_show(struct seq_file *m, void *v)
|
|||
}
|
||||
|
||||
static const struct seq_operations profile_seq_op = {
|
||||
.start = probes_seq_start,
|
||||
.next = probes_seq_next,
|
||||
.stop = probes_seq_stop,
|
||||
.start = dyn_event_seq_start,
|
||||
.next = dyn_event_seq_next,
|
||||
.stop = dyn_event_seq_stop,
|
||||
.show = probes_profile_seq_show
|
||||
};
|
||||
|
||||
|
|
@ -1332,7 +1353,7 @@ static int register_kprobe_event(struct trace_kprobe *tk)
|
|||
kfree(call->print_fmt);
|
||||
return -ENODEV;
|
||||
}
|
||||
ret = trace_add_event_call(call);
|
||||
ret = trace_add_event_call_nolock(call);
|
||||
if (ret) {
|
||||
pr_info("Failed to register kprobe event: %s\n",
|
||||
trace_event_name(call));
|
||||
|
|
@ -1347,7 +1368,7 @@ static int unregister_kprobe_event(struct trace_kprobe *tk)
|
|||
int ret;
|
||||
|
||||
/* tp->event is unregistered in trace_remove_event_call() */
|
||||
ret = trace_remove_event_call(&tk->tp.call);
|
||||
ret = trace_remove_event_call_nolock(&tk->tp.call);
|
||||
if (!ret)
|
||||
kfree(tk->tp.call.print_fmt);
|
||||
return ret;
|
||||
|
|
@ -1364,7 +1385,7 @@ create_local_trace_kprobe(char *func, void *addr, unsigned long offs,
|
|||
char *event;
|
||||
|
||||
/*
|
||||
* local trace_kprobes are not added to probe_list, so they are never
|
||||
* local trace_kprobes are not added to dyn_event, so they are never
|
||||
* searched in find_trace_kprobe(). Therefore, there is no concern of
|
||||
* duplicated name here.
|
||||
*/
|
||||
|
|
@ -1422,6 +1443,11 @@ static __init int init_kprobe_trace(void)
|
|||
{
|
||||
struct dentry *d_tracer;
|
||||
struct dentry *entry;
|
||||
int ret;
|
||||
|
||||
ret = dyn_event_register(&trace_kprobe_ops);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
if (register_module_notifier(&trace_kprobe_module_nb))
|
||||
return -EINVAL;
|
||||
|
|
@ -1479,9 +1505,8 @@ static __init int kprobe_trace_self_tests_init(void)
|
|||
|
||||
pr_info("Testing kprobe tracing: ");
|
||||
|
||||
ret = trace_run_command("p:testprobe kprobe_trace_selftest_target "
|
||||
"$stack $stack0 +0($stack)",
|
||||
create_trace_kprobe);
|
||||
ret = trace_run_command("p:testprobe kprobe_trace_selftest_target $stack $stack0 +0($stack)",
|
||||
create_or_delete_trace_kprobe);
|
||||
if (WARN_ON_ONCE(ret)) {
|
||||
pr_warn("error on probing function entry.\n");
|
||||
warn++;
|
||||
|
|
@ -1501,8 +1526,8 @@ static __init int kprobe_trace_self_tests_init(void)
|
|||
}
|
||||
}
|
||||
|
||||
ret = trace_run_command("r:testprobe2 kprobe_trace_selftest_target "
|
||||
"$retval", create_trace_kprobe);
|
||||
ret = trace_run_command("r:testprobe2 kprobe_trace_selftest_target $retval",
|
||||
create_or_delete_trace_kprobe);
|
||||
if (WARN_ON_ONCE(ret)) {
|
||||
pr_warn("error on probing function return.\n");
|
||||
warn++;
|
||||
|
|
@ -1572,20 +1597,24 @@ static __init int kprobe_trace_self_tests_init(void)
|
|||
disable_trace_kprobe(tk, file);
|
||||
}
|
||||
|
||||
ret = trace_run_command("-:testprobe", create_trace_kprobe);
|
||||
ret = trace_run_command("-:testprobe", create_or_delete_trace_kprobe);
|
||||
if (WARN_ON_ONCE(ret)) {
|
||||
pr_warn("error on deleting a probe.\n");
|
||||
warn++;
|
||||
}
|
||||
|
||||
ret = trace_run_command("-:testprobe2", create_trace_kprobe);
|
||||
ret = trace_run_command("-:testprobe2", create_or_delete_trace_kprobe);
|
||||
if (WARN_ON_ONCE(ret)) {
|
||||
pr_warn("error on deleting a probe.\n");
|
||||
warn++;
|
||||
}
|
||||
|
||||
end:
|
||||
release_all_trace_kprobes();
|
||||
ret = dyn_events_release_all(&trace_kprobe_ops);
|
||||
if (WARN_ON_ONCE(ret)) {
|
||||
pr_warn("error on cleaning up probes.\n");
|
||||
warn++;
|
||||
}
|
||||
/*
|
||||
* Wait for the optimizer work to finish. Otherwise it might fiddle
|
||||
* with probes in already freed __init text.
|
||||
|
|
|
|||
|
|
@ -154,6 +154,33 @@ int traceprobe_split_symbol_offset(char *symbol, long *offset)
|
|||
return 0;
|
||||
}
|
||||
|
||||
/* @buf must has MAX_EVENT_NAME_LEN size */
|
||||
int traceprobe_parse_event_name(const char **pevent, const char **pgroup,
|
||||
char *buf)
|
||||
{
|
||||
const char *slash, *event = *pevent;
|
||||
|
||||
slash = strchr(event, '/');
|
||||
if (slash) {
|
||||
if (slash == event) {
|
||||
pr_info("Group name is not specified\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
if (slash - event + 1 > MAX_EVENT_NAME_LEN) {
|
||||
pr_info("Group name is too long\n");
|
||||
return -E2BIG;
|
||||
}
|
||||
strlcpy(buf, event, slash - event + 1);
|
||||
*pgroup = buf;
|
||||
*pevent = slash + 1;
|
||||
}
|
||||
if (strlen(event) == 0) {
|
||||
pr_info("Event name is not specified\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
#define PARAM_MAX_STACK (THREAD_SIZE / sizeof(unsigned long))
|
||||
|
||||
static int parse_probe_vars(char *arg, const struct fetch_type *t,
|
||||
|
|
|
|||
|
|
@ -279,6 +279,8 @@ extern int traceprobe_update_arg(struct probe_arg *arg);
|
|||
extern void traceprobe_free_probe_arg(struct probe_arg *arg);
|
||||
|
||||
extern int traceprobe_split_symbol_offset(char *symbol, long *offset);
|
||||
extern int traceprobe_parse_event_name(const char **pevent,
|
||||
const char **pgroup, char *buf);
|
||||
|
||||
extern int traceprobe_set_print_fmt(struct trace_probe *tp, bool is_return);
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue
Block a user