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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
Download Patch File Download Diff File Expand all files Collapse all files

14
include/trace/events/module.h
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@@ -53,9 +53,9 @@ TRACE_EVENT(module_free,
DECLARE_EVENT_CLASS(module_refcnt,
TP_PROTO(struct module *mod, unsigned long ip, int refcnt),
TP_PROTO(struct module *mod, unsigned long ip),
TP_ARGS(mod, ip, refcnt),
TP_ARGS(mod, ip),
TP_STRUCT__entry(
__field( unsigned long, ip )
@@ -65,7 +65,7 @@ DECLARE_EVENT_CLASS(module_refcnt,
TP_fast_assign(
__entry->ip = ip;
__entry->refcnt = refcnt;
__entry->refcnt = __this_cpu_read(mod->refptr->count);
__assign_str(name, mod->name);
),
@@ -75,16 +75,16 @@ DECLARE_EVENT_CLASS(module_refcnt,
DEFINE_EVENT(module_refcnt, module_get,
TP_PROTO(struct module *mod, unsigned long ip, int refcnt),
TP_PROTO(struct module *mod, unsigned long ip),
TP_ARGS(mod, ip, refcnt)
TP_ARGS(mod, ip)
);
DEFINE_EVENT(module_refcnt, module_put,
TP_PROTO(struct module *mod, unsigned long ip, int refcnt),
TP_PROTO(struct module *mod, unsigned long ip),
TP_ARGS(mod, ip, refcnt)
TP_ARGS(mod, ip)
);
TRACE_EVENT(module_request,