This is a note to let you know that I've just added the patch titled
tracing: Remove ftrace_stop/start() from reading the trace file
to the 3.15-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-remove-ftrace_stop-start-from-reading-the-trace-file.patch
and it can be found in the queue-3.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 099ed151675cd1d2dbeae1dac697975f6a68716d Mon Sep 17 00:00:00 2001
From: "Steven Rostedt (Red Hat)" <rostedt@xxxxxxxxxxx>
Date: Tue, 24 Jun 2014 23:50:09 -0400
Subject: tracing: Remove ftrace_stop/start() from reading the trace file
From: "Steven Rostedt (Red Hat)" <rostedt@xxxxxxxxxxx>
commit 099ed151675cd1d2dbeae1dac697975f6a68716d upstream.
Disabling reading and writing to the trace file should not be able to
disable all function tracing callbacks. There's other users today
(like kprobes and perf). Reading a trace file should not stop those
from happening.
Reviewed-by: Masami Hiramatsu <masami.hiramatsu.pt@xxxxxxxxxxx>
Signed-off-by: Steven Rostedt <rostedt@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
kernel/trace/trace.c | 2 --
1 file changed, 2 deletions(-)
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -1367,7 +1367,6 @@ void tracing_start(void)
arch_spin_unlock(&ftrace_max_lock);
- ftrace_start();
out:
raw_spin_unlock_irqrestore(&global_trace.start_lock, flags);
}
@@ -1414,7 +1413,6 @@ void tracing_stop(void)
struct ring_buffer *buffer;
unsigned long flags;
- ftrace_stop();
raw_spin_lock_irqsave(&global_trace.start_lock, flags);
if (global_trace.stop_count++)
goto out;
Patches currently in stable-queue which might be from rostedt@xxxxxxxxxxx are
queue-3.15/tracing-uprobes-fix-the-usage-of-uprobe_buffer_enable-in-probe_event_enable.patch
queue-3.15/tracing-uprobes-revert-support-mix-of-ftrace-and-perf.patch
queue-3.15/tracing-remove-ftrace_stop-start-from-reading-the-trace-file.patch
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