rv: Export rv_register_reactor() and rv_unregister_reactor()

rv_react() is exported to modules, but the reactor registration helpers
are not.  Export them with EXPORT_SYMBOL_GPL() so reactor modules and
the tristate KUnit test module can register and unregister reactors
without hitting undefined symbol errors at link time(modpost).

Commit 3d3800b4f7f4 ("rv: Remove reactor's reference counter") noted
that module-based reactors, if supported, should be pinned with
try_module_get()/module_put() to prevent unloading under an active
monitor. This patch does not add that support. The only in-tree module
consumer, the tristate KUnit reactor test module, registers and
unregisters its reactor within a controlled test lifecycle.
The actual pinning is left to a follow-up series that adds support for
loadable-module reactors.

Reviewed-by: Gabriele Monaco <gmonaco@redhat.com>
Signed-off-by: Wen Yang <wen.yang@linux.dev>
Link: https://lore.kernel.org/r/94b7ec120a92b9368541ac050601e66be8fe653a.1789412799.git.wen.yang@linux.dev
Signed-off-by: Gabriele Monaco <gmonaco@redhat.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/kernel/trace/rv/rv_reactors.c b/kernel/trace/rv/rv_reactors.c
index ff7d478227c3..8e57a95d446b 100644
--- a/kernel/trace/rv/rv_reactors.c
+++ b/kernel/trace/rv/rv_reactors.c
@@ -314,6 +314,7 @@ int rv_register_reactor(struct rv_reactor *reactor)
 	guard(mutex)(&rv_interface_lock);
 	return __rv_register_reactor(reactor);
 }
+EXPORT_SYMBOL_GPL(rv_register_reactor);
 
 /**
  * rv_unregister_reactor - unregister a rv reactor.
@@ -327,6 +328,7 @@ int rv_unregister_reactor(struct rv_reactor *reactor)
 	list_del(&reactor->list);
 	return 0;
 }
+EXPORT_SYMBOL_GPL(rv_unregister_reactor);
 
 /*
  * reacting_on interface.