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| author | Li Zefan <lizf@cn.fujitsu.com> | 2010-03-24 10:57:43 +0800 |
|---|---|---|
| committer | Steven Rostedt <rostedt@goodmis.org> | 2010-03-31 22:56:58 -0400 |
| commit | ae832d1e03ac9bf09fb8a07fb37908ab40c7cd0e (patch) | |
| tree | cf754c5242e66aa0349559af880db5fa29af6f2a /kernel/module.c | |
| parent | 50354a8a28d0c91695a2d6d25b5a821bfe557a07 (diff) | |
| download | lwn-ae832d1e03ac9bf09fb8a07fb37908ab40c7cd0e.tar.gz lwn-ae832d1e03ac9bf09fb8a07fb37908ab40c7cd0e.zip | |
tracing: Remove side effect from module tracepoints that caused a GPF
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>
Diffstat (limited to 'kernel/module.c')
| -rw-r--r-- | kernel/module.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/kernel/module.c b/kernel/module.c index c968d3606dca..21591ad921f3 100644 --- a/kernel/module.c +++ b/kernel/module.c @@ -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); |