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tracing/probe: Add trace_probe init and free functions 

Add common trace_probe init and cleanup function in
trace_probe.c, and use it from trace_kprobe.c and trace_uprobe.c

Link: http://lkml.kernel.org/r/155931582664.28323.5934870189034740822.stgit@devnote2

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Masami Hiramatsu 2019-06-01 00:17:06 +09:00 committed by Steven Rostedt (VMware)
parent b4d4b96be8
commit 455b289973
4 changed files with 58 additions and 58 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

49
kernel/trace/trace_kprobe.c
View File

@ -197,6 +197,16 @@ static int kprobe_dispatcher(struct kprobe *kp, struct pt_regs *regs);
static int kretprobe_dispatcher(struct kretprobe_instance *ri,
struct pt_regs *regs);
static void free_trace_kprobe(struct trace_kprobe *tk)
{
if (tk) {
trace_probe_cleanup(&tk->tp);
kfree(tk->symbol);
free_percpu(tk->nhit);
kfree(tk);
}
}
/*
* Allocate new trace_probe and initialize it (including kprobes).
*/
@ -235,49 +245,17 @@ static struct trace_kprobe *alloc_trace_kprobe(const char *group,
tk->rp.maxactive = maxactive;
if (!event || !group) {
ret = -EINVAL;
goto error;
}
tk->tp.call.class = &tk->tp.class;
tk->tp.call.name = kstrdup(event, GFP_KERNEL);
if (!tk->tp.call.name)
goto error;
tk->tp.class.system = kstrdup(group, GFP_KERNEL);
if (!tk->tp.class.system)
ret = trace_probe_init(&tk->tp, event, group);
if (ret < 0)
goto error;
dyn_event_init(&tk->devent, &trace_kprobe_ops);
INIT_LIST_HEAD(&tk->tp.files);
return tk;
error:
kfree(tk->tp.call.name);
kfree(tk->symbol);
free_percpu(tk->nhit);
kfree(tk);
free_trace_kprobe(tk);
return ERR_PTR(ret);
}
static void free_trace_kprobe(struct trace_kprobe *tk)
{
int i;
if (!tk)
return;
for (i = 0; i < tk->tp.nr_args; i++)
traceprobe_free_probe_arg(&tk->tp.args[i]);
kfree(tk->tp.call.class->system);
kfree(tk->tp.call.name);
kfree(tk->tp.call.print_fmt);
kfree(tk->symbol);
free_percpu(tk->nhit);
kfree(tk);
}
static struct trace_kprobe *find_trace_kprobe(const char *event,
const char *group)
{
@ -1400,7 +1378,6 @@ static struct trace_event_functions kprobe_funcs = {
static inline void init_trace_event_call(struct trace_kprobe *tk,
struct trace_event_call *call)
{
INIT_LIST_HEAD(&call->class->fields);
if (trace_kprobe_is_return(tk)) {
call->event.funcs = &kretprobe_funcs;
call->class->define_fields = kretprobe_event_define_fields;

36
kernel/trace/trace_probe.c
View File

@ -884,3 +884,39 @@ int traceprobe_define_arg_fields(struct trace_event_call *event_call,
}
return 0;
}
void trace_probe_cleanup(struct trace_probe *tp)
{
int i;
for (i = 0; i < tp->nr_args; i++)
traceprobe_free_probe_arg(&tp->args[i]);
kfree(tp->call.class->system);
kfree(tp->call.name);
kfree(tp->call.print_fmt);
}
int trace_probe_init(struct trace_probe *tp, const char *event,
const char *group)
{
if (!event || !group)
return -EINVAL;
tp->call.class = &tp->class;
tp->call.name = kstrdup(event, GFP_KERNEL);
if (!tp->call.name)
return -ENOMEM;
tp->class.system = kstrdup(group, GFP_KERNEL);
if (!tp->class.system) {
kfree(tp->call.name);
tp->call.name = NULL;
return -ENOMEM;
}
INIT_LIST_HEAD(&tp->files);
INIT_LIST_HEAD(&tp->class.fields);
return 0;
}

4
kernel/trace/trace_probe.h
View File

@ -248,6 +248,10 @@ static inline bool trace_probe_is_registered(struct trace_probe *tp)
return !!(tp->flags & TP_FLAG_REGISTERED);
}
int trace_probe_init(struct trace_probe *tp, const char *event,
const char *group);
void trace_probe_cleanup(struct trace_probe *tp);
/* Check the name is good for event/group/fields */
static inline bool is_good_name(const char *name)
{

27
kernel/trace/trace_uprobe.c
View File

@ -300,25 +300,17 @@ static struct trace_uprobe *
alloc_trace_uprobe(const char *group, const char *event, int nargs, bool is_ret)
{
struct trace_uprobe *tu;
if (!event || !group)
return ERR_PTR(-EINVAL);
int ret;
tu = kzalloc(SIZEOF_TRACE_UPROBE(nargs), GFP_KERNEL);
if (!tu)
return ERR_PTR(-ENOMEM);
tu->tp.call.class = &tu->tp.class;
tu->tp.call.name = kstrdup(event, GFP_KERNEL);
if (!tu->tp.call.name)
goto error;
tu->tp.class.system = kstrdup(group, GFP_KERNEL);
if (!tu->tp.class.system)
ret = trace_probe_init(&tu->tp, event, group);
if (ret < 0)
goto error;
dyn_event_init(&tu->devent, &trace_uprobe_ops);
INIT_LIST_HEAD(&tu->tp.files);
tu->consumer.handler = uprobe_dispatcher;
if (is_ret)
tu->consumer.ret_handler = uretprobe_dispatcher;
@ -326,26 +318,18 @@ alloc_trace_uprobe(const char *group, const char *event, int nargs, bool is_ret)
return tu;
error:
kfree(tu->tp.call.name);
kfree(tu);
return ERR_PTR(-ENOMEM);
return ERR_PTR(ret);
}
static void free_trace_uprobe(struct trace_uprobe *tu)
{
int i;
if (!tu)
return;
for (i = 0; i < tu->tp.nr_args; i++)
traceprobe_free_probe_arg(&tu->tp.args[i]);
path_put(&tu->path);
kfree(tu->tp.call.class->system);
kfree(tu->tp.call.name);
kfree(tu->tp.call.print_fmt);
trace_probe_cleanup(&tu->tp);
kfree(tu->filename);
kfree(tu);
}
@ -1351,7 +1335,6 @@ static struct trace_event_functions uprobe_funcs = {
static inline void init_trace_event_call(struct trace_uprobe *tu,
struct trace_event_call *call)
{
INIT_LIST_HEAD(&call->class->fields);
call->event.funcs = &uprobe_funcs;
call->class->define_fields = uprobe_event_define_fields;