51 lines
1.4 KiB
Diff
51 lines
1.4 KiB
Diff
From fbc8904ee75e751956cbe0f7e038073e4020fa27 Mon Sep 17 00:00:00 2001
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Message-Id: <fbc8904ee75e751956cbe0f7e038073e4020fa27.1507924974.git.Jim.Somerville@windriver.com>
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From: Jim Somerville <Jim.Somerville@windriver.com>
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Date: Thu, 22 Dec 2016 17:54:11 -0500
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Subject: [PATCH 1/1] Add missing ifdef around max latency variable
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Signed-off-by: Jim Somerville <Jim.Somerville@windriver.com>
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---
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kernel/trace/trace_hwlat.c | 6 ++++++
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1 file changed, 6 insertions(+)
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diff --git a/kernel/trace/trace_hwlat.c b/kernel/trace/trace_hwlat.c
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index 4b30d8b..1bb578c 100644
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--- a/kernel/trace/trace_hwlat.c
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+++ b/kernel/trace/trace_hwlat.c
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@@ -167,7 +167,9 @@ void trace_hwlat_callback(bool enter)
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*/
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static int get_sample(void)
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{
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+#ifdef CONFIG_TRACER_MAX_TRACE
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struct trace_array *tr = hwlat_trace;
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+#endif
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time_type start, t1, t2, last_t2;
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s64 diff, total, last_total = 0;
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u64 sample = 0;
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@@ -254,9 +256,11 @@ static int get_sample(void)
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s.nmi_count = nmi_count;
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trace_hwlat_sample(&s);
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+#ifdef CONFIG_TRACER_MAX_TRACE
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/* Keep a running maximum ever recorded hardware latency */
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if (sample > tr->max_latency)
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tr->max_latency = sample;
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+#endif
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}
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out:
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@@ -582,7 +586,9 @@ static int hwlat_tracer_init(struct trace_array *tr)
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disable_migrate = false;
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hwlat_data.count = 0;
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+#ifdef CONFIG_TRACER_MAX_TRACE
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tr->max_latency = 0;
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+#endif
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save_tracing_thresh = tracing_thresh;
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/* tracing_thresh is in nsecs, we speak in usecs */
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--
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1.8.3.1
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