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tracepoints/module: Fix disabling tracepoints with taint CRAP or OOT 

Tracepoints are disabled for tainted modules, which is usually because the
module is either proprietary or was forced, and we don't want either of them
using kernel tracepoints.

But, a module can also be tainted by being in the staging directory or
compiled out of tree. Either is fine for use with tracepoints, no need
to punish them.  I found this out when I noticed that my sample trace event
module, when done out of tree, stopped working.

Cc: stable@vger.kernel.org # 3.2
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Ben Hutchings <ben@decadent.org.uk>
Cc: Dave Jones <davej@redhat.com>
Cc: Greg Kroah-Hartman <gregkh@suse.de>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt 2012-01-13 21:40:59 -05:00 committed by Steven Rostedt
parent 2e885057b7
commit c10076c430
1 changed files with 4 additions and 3 deletions
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7
kernel/tracepoint.c
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@ -634,10 +634,11 @@ static int tracepoint_module_coming(struct module *mod)
int ret = 0;
/*
* We skip modules that tain the kernel, especially those with different
* module header (for forced load), to make sure we don't cause a crash.
* We skip modules that taint the kernel, especially those with different
* module headers (for forced load), to make sure we don't cause a crash.
* Staging and out-of-tree GPL modules are fine.
*/
if (mod->taints)
if (mod->taints & ~((1 << TAINT_OOT_MODULE) | (1 << TAINT_CRAP)))
return 0;
mutex_lock(&tracepoints_mutex);
tp_mod = kmalloc(sizeof(struct tp_module), GFP_KERNEL);