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Date: Fri, 26 Aug 2022 15:48:42 -0700 From: Dave Jiang <dave.jiang@...el.com> To: alison.schofield@...el.com, Steven Rostedt <rostedt@...dmis.org> Cc: linux-kernel@...r.kernel.org, linux-cxl@...r.kernel.org, Ira Weiny <ira.weiny@...el.com>, Dan Williams <dan.j.williams@...el.com> Subject: Re: [PATCH] tracepoint: Allow trace events in modules with TAINT_TEST On 8/26/2022 3:35 PM, alison.schofield@...el.com wrote: > From: Alison Schofield <alison.schofield@...el.com> > > Commit 2852ca7fba9f ("panic: Taint kernel if tests are run") > introduced a new taint type, TAINT_TEST, to signal that an > in-kernel test has been run. has been loaded? > > TAINT_TEST taint type defaults into a 'bad_taint' list for > kernel tracing and blocks the creation of trace events. This > causes a problem for CXL testing where loading the cxl_test > module makes all CXL modules out-of-tree, blocking any trace > events. > > Trace events are in development for CXL at the moment and this > issue was found in test with v6.0-rc1. > > Reported-by: Ira Weiny <ira.weiny@...el.com> > Suggested-by: Dan Williams <dan.j.williams@...el.com> > Signed-off-by: Alison Schofield <alison.schofield@...el.com> > --- > kernel/tracepoint.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/kernel/tracepoint.c b/kernel/tracepoint.c > index 64ea283f2f86..5f17378c9dc2 100644 > --- a/kernel/tracepoint.c > +++ b/kernel/tracepoint.c > @@ -571,7 +571,8 @@ static void for_each_tracepoint_range( > bool trace_module_has_bad_taint(struct module *mod) > { > return mod->taints & ~((1 << TAINT_OOT_MODULE) | (1 << TAINT_CRAP) | > - (1 << TAINT_UNSIGNED_MODULE)); > + (1 << TAINT_UNSIGNED_MODULE) | > + (1 << TAINT_TEST)); > } > > static BLOCKING_NOTIFIER_HEAD(tracepoint_notify_list); > > base-commit: 4c612826bec1441214816827979b62f84a097e91
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