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tracing: Remove side effect from module tracepoints that caused a GPF

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Remove the @refcnt argument, because it has side-effects, and arguments with
side-effects are not skipped by the jump over disabled instrumentation and are
executed even when the tracepoint is disabled.

This was also causing a GPF as found by Randy Dunlap:

Subject: 2.6.33 GP fault only when built with tracing
LKML-Reference: <4BA2B69D.3000309@oracle.com>

Note, the current 2.6.34-rc has a fix for the actual cause of the GPF,
but this fixes one of its triggers.

Tested-by: Randy Dunlap <randy.dunlap@oracle.com>
Acked-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
LKML-Reference: <4BA97FA7.6040406@cn.fujitsu.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Li Zefan 2010-03-24 10:57:43 +08:00 • committed by Steven Rostedt
parent 50354a8a28
commit ae832d1e03
3 changed files with 10 additions and 13 deletions
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3
kernel/module.c
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@ -800,8 +800,7 @@ void module_put(struct module *module)
preempt_disable();
__this_cpu_dec(module->refptr->count);
trace_module_put(module, _RET_IP_,
__this_cpu_read(module->refptr->count));
trace_module_put(module, _RET_IP_);
/* Maybe they're waiting for us to drop reference? */
if (unlikely(!module_is_live(module)))
wake_up_process(module->waiter);