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authorPavankumar Kondeti <pkondeti@codeaurora.org>2016-12-09 21:50:17 +0530
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-07-21 08:12:23 +0200
commitda89aa5b8c67b130181e56b3382506a319818091 (patch)
tree9a505151d76c119aefd6e965c7a988cc3df6eedd
parent9abcd35a85b1658ed30fcdc706db2f49ada66b65 (diff)
tracing: Use SOFTIRQ_OFFSET for softirq dectection for more accurate results
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@codeaurora.org> Signed-off-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Amit Pundir <amit.pundir@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--kernel/trace/trace.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 02773a1b5ab8..5b83ac63e7e9 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -1587,7 +1587,7 @@ tracing_generic_entry_update(struct trace_entry *entry, unsigned long flags,
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);
}