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Date: Fri, 7 Dec 2018 11:22:29 +0900
From: Masami Hiramatsu <mhiramat@...nel.org>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
Tom Zanussi <tom.zanussi@...ux.intel.com>,
Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>
Subject: Re: [PATCH v2 10/12] tracing: Remove orphaned
trace_add/remove_event_call functions
On Tue, 4 Dec 2018 13:51:20 -0500
Steven Rostedt <rostedt@...dmis.org> wrote:
> On Mon, 5 Nov 2018 18:04:29 +0900
> Masami Hiramatsu <mhiramat@...nel.org> wrote:
>
> > Remove trace_add_event_call() and trace_remove_event_call()
> > functions since those are not used anymore.
> >
> > Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>
>
> Hi Masami,
>
> I've applied the series locally (need to test it) except for this
> patch. Honestly, I hate the "_nolock" name, and it makes no sense when
>
> 1) they still grab locks
> 2) there's no version without "_nolock"
Agreed.
>
> I added this patch in its place:
That looks good to me too. I thought to add similar patch, but just waited
for the comment.
Acked-by: Masami Hiramatsu <mhiramat@...nel.org>
Thank you!
>
> -- Steve
>
> From: "Steven Rostedt (VMware)" <rostedt@...dmis.org>
> Date: Tue, 4 Dec 2018 13:35:45 -0500
> Subject: [PATCH] tracing: Consolidate trace_add/remove_event_call back to the
> nolock functions
>
> The trace_add/remove_event_call_nolock() functions were added to allow
> the tace_add/remove_event_call() code be called when the event_mutex
> lock was already taken. Now that all callers are done within the
> event_mutex, there's no reason to have two different interfaces.
>
> Remove the current wrapper trace_add/remove_event_call()s and rename the
> _nolock versions back to the original names.
>
> Link: http://lkml.kernel.org/r/154140866955.17322.2081425494660638846.stgit@devbox
>
> Signed-off-by: Steven Rostedt (VMware) <rostedt@...dmis.org>
> ---
> include/linux/trace_events.h | 2 --
> kernel/trace/trace_events.c | 30 ++++--------------------------
> kernel/trace/trace_events_hist.c | 6 +++---
> kernel/trace/trace_kprobe.c | 4 ++--
> kernel/trace/trace_uprobe.c | 4 ++--
> 5 files changed, 11 insertions(+), 35 deletions(-)
>
> diff --git a/include/linux/trace_events.h b/include/linux/trace_events.h
> index 3aa05593a53f..4130a5497d40 100644
> --- a/include/linux/trace_events.h
> +++ b/include/linux/trace_events.h
> @@ -529,8 +529,6 @@ extern int trace_event_raw_init(struct trace_event_call *call);
> extern int trace_define_field(struct trace_event_call *call, const char *type,
> const char *name, int offset, int size,
> int is_signed, int filter_type);
> -extern int trace_add_event_call_nolock(struct trace_event_call *call);
> -extern int trace_remove_event_call_nolock(struct trace_event_call *call);
> extern int trace_add_event_call(struct trace_event_call *call);
> extern int trace_remove_event_call(struct trace_event_call *call);
> extern int trace_event_get_offsets(struct trace_event_call *call);
> diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
> index a3b157f689ee..bd0162c0467c 100644
> --- a/kernel/trace/trace_events.c
> +++ b/kernel/trace/trace_events.c
> @@ -2305,7 +2305,8 @@ __trace_early_add_new_event(struct trace_event_call *call,
> struct ftrace_module_file_ops;
> static void __add_event_to_tracers(struct trace_event_call *call);
>
> -int trace_add_event_call_nolock(struct trace_event_call *call)
> +/* Add an additional event_call dynamically */
> +int trace_add_event_call(struct trace_event_call *call)
> {
> int ret;
> lockdep_assert_held(&event_mutex);
> @@ -2320,17 +2321,6 @@ int trace_add_event_call_nolock(struct trace_event_call *call)
> return ret;
> }
>
> -/* Add an additional event_call dynamically */
> -int trace_add_event_call(struct trace_event_call *call)
> -{
> - int ret;
> -
> - mutex_lock(&event_mutex);
> - ret = trace_add_event_call_nolock(call);
> - mutex_unlock(&event_mutex);
> - return ret;
> -}
> -
> /*
> * Must be called under locking of trace_types_lock, event_mutex and
> * trace_event_sem.
> @@ -2376,8 +2366,8 @@ static int probe_remove_event_call(struct trace_event_call *call)
> return 0;
> }
>
> -/* no event_mutex version */
> -int trace_remove_event_call_nolock(struct trace_event_call *call)
> +/* Remove an event_call */
> +int trace_remove_event_call(struct trace_event_call *call)
> {
> int ret;
>
> @@ -2392,18 +2382,6 @@ int trace_remove_event_call_nolock(struct trace_event_call *call)
> return ret;
> }
>
> -/* Remove an event_call */
> -int trace_remove_event_call(struct trace_event_call *call)
> -{
> - int ret;
> -
> - mutex_lock(&event_mutex);
> - ret = trace_remove_event_call_nolock(call);
> - mutex_unlock(&event_mutex);
> -
> - return ret;
> -}
> -
> #define for_each_event(event, start, end) \
> for (event = start; \
> (unsigned long)event < (unsigned long)end; \
> diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
> index 21e4954375a1..82e72c48a5a9 100644
> --- a/kernel/trace/trace_events_hist.c
> +++ b/kernel/trace/trace_events_hist.c
> @@ -960,7 +960,7 @@ static int register_synth_event(struct synth_event *event)
> call->data = event;
> call->tp = event->tp;
>
> - ret = trace_add_event_call_nolock(call);
> + ret = trace_add_event_call(call);
> if (ret) {
> pr_warn("Failed to register synthetic event: %s\n",
> trace_event_name(call));
> @@ -969,7 +969,7 @@ static int register_synth_event(struct synth_event *event)
>
> ret = set_synth_event_print_fmt(call);
> if (ret < 0) {
> - trace_remove_event_call_nolock(call);
> + trace_remove_event_call(call);
> goto err;
> }
> out:
> @@ -984,7 +984,7 @@ static int unregister_synth_event(struct synth_event *event)
> struct trace_event_call *call = &event->call;
> int ret;
>
> - ret = trace_remove_event_call_nolock(call);
> + ret = trace_remove_event_call(call);
>
> return ret;
> }
> diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
> index bdf8c2ad5152..0e0f7b8024fb 100644
> --- a/kernel/trace/trace_kprobe.c
> +++ b/kernel/trace/trace_kprobe.c
> @@ -1353,7 +1353,7 @@ static int register_kprobe_event(struct trace_kprobe *tk)
> kfree(call->print_fmt);
> return -ENODEV;
> }
> - ret = trace_add_event_call_nolock(call);
> + ret = trace_add_event_call(call);
> if (ret) {
> pr_info("Failed to register kprobe event: %s\n",
> trace_event_name(call));
> @@ -1368,7 +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_nolock(&tk->tp.call);
> + ret = trace_remove_event_call(&tk->tp.call);
> if (!ret)
> kfree(tk->tp.call.print_fmt);
> return ret;
> diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c
> index 4a7b21c891f3..e335576b9411 100644
> --- a/kernel/trace/trace_uprobe.c
> +++ b/kernel/trace/trace_uprobe.c
> @@ -1320,7 +1320,7 @@ static int register_uprobe_event(struct trace_uprobe *tu)
> return -ENODEV;
> }
>
> - ret = trace_add_event_call_nolock(call);
> + ret = trace_add_event_call(call);
>
> if (ret) {
> pr_info("Failed to register uprobe event: %s\n",
> @@ -1337,7 +1337,7 @@ static int unregister_uprobe_event(struct trace_uprobe *tu)
> int ret;
>
> /* tu->event is unregistered in trace_remove_event_call() */
> - ret = trace_remove_event_call_nolock(&tu->tp.call);
> + ret = trace_remove_event_call(&tu->tp.call);
> if (ret)
> return ret;
> kfree(tu->tp.call.print_fmt);
> --
> 2.19.2
>
--
Masami Hiramatsu <mhiramat@...nel.org>
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