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perf trace scripting: Fix extern struct definitions 

Both python_scripting_ops and perl_scripting_ops have two global definitions.
One in trace-event-scripting.c and one in their respective scripting-engine
modules.

The issue is that depending on the linker order one definition or the other
is chosen. One is uninitialized (bss), while the other is initialized. If
the uninitialized version is chosen, then perf does not function properly.

This patch fixes this by adding the extern prefix to the definitions in
trace-event-scripting.c.

Cc: David S. Miller <davem@davemloft.net>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Robert Richter <robert.richter@amd.com>
LKML-Reference: <4c97e41a.078fd80a.7a8b.3cc9@mx.google.com>
Signed-off-by: Stephane Eranian <eranian@google.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Stephane Eranian 2010-09-21 00:45:01 +02:00 committed by Arnaldo Carvalho de Melo
parent c569d3326b
commit 0f940cb7d9
1 changed files with 2 additions and 2 deletions
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4
tools/perf/util/trace-event-scripting.c
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@ -97,7 +97,7 @@ void setup_python_scripting(void)
register_python_scripting(&python_scripting_unsupported_ops); register_python_scripting(&python_scripting_unsupported_ops);
} }
#else #else
struct scripting_ops python_scripting_ops; extern struct scripting_ops python_scripting_ops;
void setup_python_scripting(void) void setup_python_scripting(void)
{ {
@ -158,7 +158,7 @@ void setup_perl_scripting(void)
register_perl_scripting(&perl_scripting_unsupported_ops); register_perl_scripting(&perl_scripting_unsupported_ops);
} }
#else #else
struct scripting_ops perl_scripting_ops; extern struct scripting_ops perl_scripting_ops;
void setup_perl_scripting(void) void setup_perl_scripting(void)
{ {