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tracing: Erase irqsoff trace with empty write

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One convenient way to erase trace is "echo > trace". However, this
is currently broken if the current tracer is irqsoff tracer. This
is because irqsoff tracer use max_buffer as the default trace
buffer.

Set the max_buffer as the one to be cleared when it's the trace
buffer currently in use.

Link: http://lkml.kernel.org/r/1505754215-29411-1-git-send-email-byan@nvidia.com

Cc: <mingo@redhat.com>
Cc: stable@vger.kernel.org
Fixes: 4acd4d00f ("tracing: give easy way to clear trace buffer")
Signed-off-by: Bo Yan <byan@nvidia.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Bo Yan 2017-09-18 10:03:35 -07:00 committed by Steven Rostedt (VMware)
parent 170b3b1050
commit 8dd33bcb70
1 changed files with 8 additions and 2 deletions
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10
kernel/trace/trace.c
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@ -4020,11 +4020,17 @@ static int tracing_open(struct inode *inode, struct file *file)
/* If this file was open for write, then erase contents */
if ((file->f_mode & FMODE_WRITE) && (file->f_flags & O_TRUNC)) {
int cpu = tracing_get_cpu(inode);
struct trace_buffer *trace_buf = &tr->trace_buffer;
#ifdef CONFIG_TRACER_MAX_TRACE
if (tr->current_trace->print_max)
trace_buf = &tr->max_buffer;
#endif
if (cpu == RING_BUFFER_ALL_CPUS)
tracing_reset_online_cpus(&tr->trace_buffer);
tracing_reset_online_cpus(trace_buf);
else
tracing_reset(&tr->trace_buffer, cpu);
tracing_reset(trace_buf, cpu);
}
if (file->f_mode & FMODE_READ) {