linux-kernel - [PATCH 1/3] tracing: Treat recording comm for idle task as a success

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Date:   Thu,  6 Jul 2017 16:00:21 -0700
From:   Joel Fernandes <joelaf@...gle.com>
To:     linux-kernel@...r.kernel.org
Cc:     mikesart@...il.com, Joel Fernandes <joelaf@...gle.com>,
        kernel-team@...roid.com, Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>
Subject: [PATCH 1/3] tracing: Treat recording comm for idle task as a success

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.

Cc: kernel-team@...roid.com
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Ingo Molnar <mingo@...hat.com>
Reported-by: Michael Sartain <mikesart@...il.com>
Signed-off-by: Joel Fernandes <joelaf@...gle.com>
---
 kernel/trace/trace.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index c579dea4a0eb..7a0c493723a9 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -1916,7 +1916,11 @@ static int trace_save_cmdline(struct task_struct *tsk)
 {
 	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;
 
 	/*
-- 
2.13.2.725.g09c95d1e9-goog