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tracing/urgent: warn in case of ftrace_start_up inbalance

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Prevent from further ftrace_start_up inbalances so that we avoid
future nop patching omissions with dynamic ftrace.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Frederic Weisbecker
2009-06-20 06:52:21 +02:00
parent c85a17e226
commit 9ea1a153a4
1 changed files with 7 additions and 0 deletions
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7
kernel/trace/ftrace.c
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@@ -1224,6 +1224,13 @@ static void ftrace_shutdown(int command)
return; return;
ftrace_start_up--; ftrace_start_up--;
/*
* Just warn in case of unbalance, no need to kill ftrace, it's not
* critical but the ftrace_call callers may be never nopped again after
* further ftrace uses.
*/
WARN_ON_ONCE(ftrace_start_up < 0);
if (!ftrace_start_up) if (!ftrace_start_up)
command |= FTRACE_DISABLE_CALLS; command |= FTRACE_DISABLE_CALLS;