forked from Minki/linux
ac1d52d0b8
Impact: fix a warning during preemptirqsoff selftests
When the preemptirqsoff selftest fails, we see the following
warning:
[ 6.050000] Testing tracer preemptirqsoff: .. no entries found ..
------------[ cut here ]------------
[ 6.060000] WARNING: at kernel/trace/trace.c:688 tracing_start+0x67/0xd3()
[ 6.060000] Modules linked in:
[ 6.060000] Pid: 1, comm: swapper Tainted: G
[ 6.060000] Call Trace:
[ 6.060000] [<ffffffff802460ff>] warn_slowpath+0xb1/0x100
[ 6.060000] [<ffffffff802a8f5b>] ? trace_preempt_on+0x35/0x4b
[ 6.060000] [<ffffffff802a37fb>] ? tracing_start+0x31/0xd3
[ 6.060000] [<ffffffff802a37fb>] ? tracing_start+0x31/0xd3
[ 6.060000] [<ffffffff80271e0b>] ? __lock_acquired+0xe6/0x1f2
[ 6.060000] [<ffffffff802a37fb>] ? tracing_start+0x31/0xd3
[ 6.060000] [<ffffffff802a3831>] tracing_start+0x67/0xd3
[ 6.060000] [<ffffffff802a8ace>] ? irqsoff_tracer_reset+0x2d/0x57
[ 6.060000] [<ffffffff802a4d1c>] trace_selftest_startup_preemptirqsoff+0x1c8/0x1f1
[ 6.060000] [<ffffffff802a4798>] register_tracer+0x12f/0x241
[ 6.060000] [<ffffffff810250d0>] ? init_irqsoff_tracer+0x0/0x53
[ 6.060000] [<ffffffff8102510b>] init_irqsoff_tracer+0x3b/0x53
This is because in fail case, the preemptirqsoff tracer selftest calls twice
the tracing_start() function:
int
trace_selftest_startup_preemptirqsoff(struct tracer *trace, struct trace_array *tr)
{
if (!ret && !count) {
printk(KERN_CONT ".. no entries found ..");
ret = -1;
tracing_start(); <-----
goto out;
}
[...]
out:
trace->reset(tr);
tracing_start(); <------
tracing_max_latency = save_max;
return ret;
}
Since it is well handled in the out path, we don't need the conditional one.
Reported-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <1237159961-7447-1-git-send-email-fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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|---|---|---|
| .. | ||
| blktrace.c | ||
| events.c | ||
| ftrace.c | ||
| Kconfig | ||
| kmemtrace.c | ||
| Makefile | ||
| ring_buffer.c | ||
| trace_boot.c | ||
| trace_branch.c | ||
| trace_clock.c | ||
| trace_event_types.h | ||
| trace_events_stage_1.h | ||
| trace_events_stage_2.h | ||
| trace_events_stage_3.h | ||
| trace_events.c | ||
| trace_export.c | ||
| trace_functions_graph.c | ||
| trace_functions.c | ||
| trace_hw_branches.c | ||
| trace_irqsoff.c | ||
| trace_mmiotrace.c | ||
| trace_nop.c | ||
| trace_output.c | ||
| trace_output.h | ||
| trace_power.c | ||
| trace_printk.c | ||
| trace_sched_switch.c | ||
| trace_sched_wakeup.c | ||
| trace_selftest_dynamic.c | ||
| trace_selftest.c | ||
| trace_stack.c | ||
| trace_stat.c | ||
| trace_stat.h | ||
| trace_syscalls.c | ||
| trace_sysprof.c | ||
| trace_workqueue.c | ||
| trace.c | ||
| trace.h | ||