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ring-buffer: do not swap if recording is disabled

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If the ring buffer recording has been disabled. Do not let
swapping of ring buffers occur. Simply return -EAGAIN.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Steven Rostedt
2009-01-21 15:24:56 -05:00
committed by Ingo Molnar
parent 5bc4564b22
commit 97b17efe45
2 changed files with 16 additions and 1 deletions
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2
kernel/trace/trace.c
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@@ -415,7 +415,7 @@ update_max_tr_single(struct trace_array *tr, struct task_struct *tsk, int cpu)
ftrace_enable_cpu();
WARN_ON_ONCE(ret);
WARN_ON_ONCE(ret && ret != -EAGAIN);
__update_max_tr(tr, tsk, cpu);
__raw_spin_unlock(&ftrace_max_lock);