This is a note to let you know that I've just added the patch titled
tracing: Treat recording comm for idle task as a success
to the 4.9-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-treat-recording-comm-for-idle-task-as-a-success.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From eaf260ac04d9b4cf9f458d5c97555bfff2da526e Mon Sep 17 00:00:00 2001
From: Joel Fernandes <joelaf@xxxxxxxxxx>
Date: Thu, 6 Jul 2017 16:00:21 -0700
Subject: tracing: Treat recording comm for idle task as a success
From: Joel Fernandes <joelaf@xxxxxxxxxx>
commit eaf260ac04d9b4cf9f458d5c97555bfff2da526e upstream.
Currently we stop recording comm for non-idle tasks when switching from/to idle
task since we treat that as a record failure. Fix that by treat recording of
comm for idle task as a success.
Link: http://lkml.kernel.org/r/20170706230023.17942-1-joelaf@xxxxxxxxxx
Cc: kernel-team@xxxxxxxxxxx
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Reported-by: Michael Sartain <mikesart@xxxxxxxxx>
Signed-off-by: Joel Fernandes <joelaf@xxxxxxxxxx>
Signed-off-by: Steven Rostedt (VMware) <rostedt@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
kernel/trace/trace.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -1811,7 +1811,11 @@ static int trace_save_cmdline(struct tas
{
unsigned pid, idx;
- if (!tsk->pid || unlikely(tsk->pid > PID_MAX_DEFAULT))
+ /* treat recording of idle task as a success */
+ if (!tsk->pid)
+ return 1;
+
+ if (unlikely(tsk->pid > PID_MAX_DEFAULT))
return 0;
/*
Patches currently in stable-queue which might be from joelaf@xxxxxxxxxx are
queue-4.9/tracing-treat-recording-comm-for-idle-task-as-a-success.patch
