linux-kernel - [PATCH 3.18 28/28] tracing: Use SOFTIRQ_OFFSET for softirq dectection for more accurate results

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Message-Id: <20170719111321.538545958@linuxfoundation.org>
Date:   Wed, 19 Jul 2017 13:15:56 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Pavankumar Kondeti <pkondeti@...eaurora.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Amit Pundir <amit.pundir@...aro.org>
Subject: [PATCH 3.18 28/28] tracing: Use SOFTIRQ_OFFSET for softirq dectection for more accurate results

3.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Pavankumar Kondeti <pkondeti@...eaurora.org>

commit c59f29cb144a6a0dfac16ede9dc8eafc02dc56ca upstream.

The 's' flag is supposed to indicate that a softirq is running. This
can be detected by testing the preempt_count with SOFTIRQ_OFFSET.

The current code tests the preempt_count with SOFTIRQ_MASK, which
would be true even when softirqs are disabled but not serving a
softirq.

Link: http://lkml.kernel.org/r/1481300417-3564-1-git-send-email-pkondeti@codeaurora.org

Signed-off-by: Pavankumar Kondeti <pkondeti@...eaurora.org>
Signed-off-by: Steven Rostedt <rostedt@...dmis.org>
Signed-off-by: Amit Pundir <amit.pundir@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 kernel/trace/trace.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -1587,7 +1587,7 @@ tracing_generic_entry_update(struct trac
 		TRACE_FLAG_IRQS_NOSUPPORT |
 #endif
 		((pc & HARDIRQ_MASK) ? TRACE_FLAG_HARDIRQ : 0) |
-		((pc & SOFTIRQ_MASK) ? TRACE_FLAG_SOFTIRQ : 0) |
+		((pc & SOFTIRQ_OFFSET) ? TRACE_FLAG_SOFTIRQ : 0) |
 		(tif_need_resched() ? TRACE_FLAG_NEED_RESCHED : 0) |
 		(test_preempt_need_resched() ? TRACE_FLAG_PREEMPT_RESCHED : 0);
 }