Commit 41ede23e authored by Steven Rostedt's avatar Steven Rostedt Committed by Steven Rostedt
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ring-buffer: disable writers when resetting buffers 



As a precaution, it is best to disable writing to the ring buffers
when reseting them.

[ Impact: prevent weird things if write happens during reset ]

Signed-off-by: default avatarSteven Rostedt <rostedt@goodmis.org>
parent afbab76a

kernel/trace/ring_buffer.c

+4 −0
Original line number Diff line number Diff line
@@ -2650,6 +2650,8 @@ void ring_buffer_reset_cpu(struct ring_buffer *buffer, int cpu) 
	if (!cpumask_test_cpu(cpu, buffer->cpumask))

		return;



	atomic_inc(&cpu_buffer->record_disabled);



	spin_lock_irqsave(&cpu_buffer->reader_lock, flags);



	__raw_spin_lock(&cpu_buffer->lock);
@@ -2659,6 +2661,8 @@ void ring_buffer_reset_cpu(struct ring_buffer *buffer, int cpu) 
	__raw_spin_unlock(&cpu_buffer->lock);



	spin_unlock_irqrestore(&cpu_buffer->reader_lock, flags);



	atomic_dec(&cpu_buffer->record_disabled);

}

EXPORT_SYMBOL_GPL(ring_buffer_reset_cpu);