tracing/ftrace: stop {irqs, preempt}soff tracers when tracing is stopped

[linux-2.6-block.git] / kernel / trace / trace_selftest.c

diff --git a/kernel/trace/trace_selftest.c b/kernel/trace/trace_selftest.c
index a2ca6f0fef9bb459d99038e2436f3e2a5f0a85bc..38856ba78a921e3251d7af08c74101fd4aa7edfc 100644 (file)
--- a/kernel/trace/trace_selftest.c
+++ b/kernel/trace/trace_selftest.c
@@ -315,6 +315,14 @@ trace_selftest_startup_irqsoff(struct tracer *trace, struct trace_array *tr)
        local_irq_disable();
        udelay(100);
        local_irq_enable();
+
+       /*
+        * Stop the tracer to avoid a warning subsequent
+        * to buffer flipping failure because tracing_stop()
+        * disables the tr and max buffers, making flipping impossible
+        * in case of parallels max irqs off latencies.
+        */
+       trace->stop(tr);
        /* stop the tracing. */
        tracing_stop();
        /* check both trace buffers */
@@ -369,6 +377,14 @@ trace_selftest_startup_preemptoff(struct tracer *trace, struct trace_array *tr)
        preempt_disable();
        udelay(100);
        preempt_enable();
+
+       /*
+        * Stop the tracer to avoid a warning subsequent
+        * to buffer flipping failure because tracing_stop()
+        * disables the tr and max buffers, making flipping impossible
+        * in case of parallels max preempt off latencies.
+        */
+       trace->stop(tr);
        /* stop the tracing. */
        tracing_stop();
        /* check both trace buffers */
@@ -428,6 +444,13 @@ trace_selftest_startup_preemptirqsoff(struct tracer *trace, struct trace_array *
        /* reverse the order of preempt vs irqs */
        local_irq_enable();
 
+       /*
+        * Stop the tracer to avoid a warning subsequent
+        * to buffer flipping failure because tracing_stop()
+        * disables the tr and max buffers, making flipping impossible
+        * in case of parallels max irqs/preempt off latencies.
+        */
+       trace->stop(tr);
        /* stop the tracing. */
        tracing_stop();
        /* check both trace buffers */
@@ -448,6 +471,8 @@ trace_selftest_startup_preemptirqsoff(struct tracer *trace, struct trace_array *
        /* do the test by disabling interrupts first this time */
        tracing_max_latency = 0;
        tracing_start();
+       trace->start(tr);
+
        preempt_disable();
        local_irq_disable();
        udelay(100);
@@ -455,6 +480,7 @@ trace_selftest_startup_preemptirqsoff(struct tracer *trace, struct trace_array *
        /* reverse the order of preempt vs irqs */
        local_irq_enable();
 
+       trace->stop(tr);
        /* stop the tracing. */
        tracing_stop();
        /* check both trace buffers */