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Subject[RFC][PATCH -tip 9/9] tracing: kprobe-tracer plugin supports module_probe
Use register/unregister_module_*probe functions for tracing
module .init/.exit functions.

Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Cc: Ingo Molnar <mingo@elte.hu>
---
kernel/trace/trace_kprobe.c | 15 ++++++++++-----
1 files changed, 10 insertions(+), 5 deletions(-)

diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index e801e8c..7b7ab53 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -226,6 +226,11 @@ static void free_trace_probe(struct trace_probe *tp)
kfree(tp);
}

+static int activate_handler(void *offset, struct module *mod)
+{
+ return ((unsigned long)offset == 0) ? 1 : 0;
+}
+
static int register_trace_probe(struct trace_probe *tp)
{
int ret;
@@ -234,9 +239,10 @@ static int register_trace_probe(struct trace_probe *tp)
list_add_tail(&tp->list, &probe_list);

if (probe_is_return(tp))
- ret = register_kretprobe(&tp->rp);
+ ret = register_module_kretprobe(&tp->rp, activate_handler, 0);
else
- ret = register_kprobe(&tp->kp);
+ ret = register_module_kprobe(&tp->kp, activate_handler,
+ (void *)(tp->kp.offset));

if (ret) {
pr_warning("Probe registering error: %d\n", ret);
@@ -249,9 +255,9 @@ static int register_trace_probe(struct trace_probe *tp)
static void unregister_trace_probe(struct trace_probe *tp)
{
if (probe_is_return(tp))
- unregister_kretprobe(&tp->rp);
+ unregister_module_kretprobe(&tp->rp);
else
- unregister_kprobe(&tp->kp);
+ unregister_module_kprobe(&tp->kp);
list_del(&tp->list);
}

@@ -301,7 +307,6 @@ static int create_trace_probe(int argc, char **argv)
} else {
/* a symbol specified */
symbol = argv[1];
- /* TODO: support .init module functions */
tmp = strchr(symbol, '+');
if (!tmp)
tmp = strchr(symbol, '-');
--
Masami Hiramatsu
Software Engineer
Hitachi Computer Products (America) Inc.
Software Solutions Division

e-mail: mhiramat@redhat.com




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