This is a note to let you know that I've just added the patch titled
tracing: Consolidate trace_add/remove_event_call back to the nolock functions
to the 4.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
tracing-consolidate-trace_add-remove_event_call-back-to-the-nolock-functions.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From stable+bounces-43482-greg=kroah.com@xxxxxxxxxxxxxxx Thu May 9 04:30:26 2024
From: George Guo <dongtai.guo@xxxxxxxxx>
Date: Thu, 9 May 2024 10:29:23 +0800
Subject: tracing: Consolidate trace_add/remove_event_call back to the nolock functions
To: gregkh@xxxxxxxxxxxxxxxxxxx, rostedt@xxxxxxxxxxx, mhiramat@xxxxxxxxxx, tom.zanussi@xxxxxxxxxxxxxxx
Cc: stable@xxxxxxxxxxxxxxx, George Guo <guodongtai@xxxxxxxxxx>
Message-ID: <20240509022931.3513365-6-dongtai.guo@xxxxxxxxx>
From: "Steven Rostedt (VMware)" <rostedt@xxxxxxxxxxx>
commit 7e1413edd6194a9807aa5f3ac0378b9b4b9da879 upstream.
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
Acked-by: Masami Hiramatsu <mhiramat@xxxxxxxxxx>
Signed-off-by: Steven Rostedt (VMware) <rostedt@xxxxxxxxxxx>
Signed-off-by: George Guo <guodongtai@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
include/linux/trace_events.h | 2 --
kernel/trace/trace_events.c | 30 ++++--------------------------
kernel/trace/trace_events_hist.c | 6 +++---
3 files changed, 7 insertions(+), 31 deletions(-)
--- a/include/linux/trace_events.h
+++ b/include/linux/trace_events.h
@@ -529,8 +529,6 @@ extern int trace_event_raw_init(struct t
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);
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -2312,7 +2312,8 @@ __trace_early_add_new_event(struct trace
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);
@@ -2327,17 +2328,6 @@ int trace_add_event_call_nolock(struct t
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.
@@ -2383,8 +2373,8 @@ static int probe_remove_event_call(struc
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;
@@ -2398,18 +2388,6 @@ int trace_remove_event_call_nolock(struc
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; \
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -980,7 +980,7 @@ static int register_synth_event(struct s
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));
@@ -989,7 +989,7 @@ static int register_synth_event(struct s
ret = set_synth_event_print_fmt(call);
if (ret < 0) {
- trace_remove_event_call_nolock(call);
+ trace_remove_event_call(call);
goto err;
}
out:
@@ -1004,7 +1004,7 @@ static int unregister_synth_event(struct
struct trace_event_call *call = &event->call;
int ret;
- ret = trace_remove_event_call_nolock(call);
+ ret = trace_remove_event_call(call);
return ret;
}
Patches currently in stable-queue which might be from kroah.com@xxxxxxxxxxxxxxx are
queue-4.19/tracing-consolidate-trace_add-remove_event_call-back-to-the-nolock-functions.patch
queue-4.19/tracing-split-up-onmatch-action-data.patch
queue-4.19/tracing-remove-unnecessary-var_ref-destroy-in-track_data_destroy.patch
queue-4.19/tracing-use-str_has_prefix-helper-for-histogram-code.patch
queue-4.19/tracing-simplify-creation-and-deletion-of-synthetic-events.patch
queue-4.19/tracing-refactor-hist-trigger-action-code.patch
queue-4.19/string.h-add-str_has_prefix-helper-function.patch
queue-4.19/tracing-remove-unneeded-synth_event_mutex.patch
queue-4.19/tracing-add-unified-dynamic-event-framework.patch
queue-4.19/tracing-use-dyn_event-framework-for-synthetic-events.patch
queue-4.19/tracing-use-str_has_prefix-instead-of-using-fixed-sizes.patch
queue-4.19/tracing-generalize-hist-trigger-onmax-and-save-action.patch
queue-4.19/tracing-have-the-historgram-use-the-result-of-str_has_prefix-for-len-of-prefix.patch
