diff options
| author | Pavankumar Kondeti <pkondeti@codeaurora.org> | 2016-12-09 21:50:17 +0530 |
|---|---|---|
| committer | Pavankumar Kondeti <pkondeti@codeaurora.org> | 2017-01-18 07:05:59 +0530 |
| commit | f4f127a9ba71c5d6920c10609b076d41e408b369 (patch) | |
| tree | 33e3f52f8e882f4f09f435c5190974323aa174f0 /kernel/trace/trace.c | |
| parent | 4b3736890b25b8af6a8468f13ef8a310c7468a92 (diff) | |
tracing: Use SOFTIRQ_OFFSET for softirq dectection for more accurate results
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
Change-Id: I084531ce806e0f7d42a38be0a7ad45977c43d158
Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Git-commit: c59f29cb144a6a0dfac16ede9dc8eafc02dc56ca
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
Diffstat (limited to 'kernel/trace/trace.c')
| -rw-r--r-- | kernel/trace/trace.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index ae68222c5a74..1d0f1a1ac44c 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -1685,7 +1685,7 @@ 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); } |