ctf: force dtrace_ctf.ko to be loaded whenever dtrace.ko is

DTrace userspace makes the simplifying assumption that dtrace_ctf.ko (containing
the CTF for the kernel, for built-in modules, and for shared types, but no code)
is always loaded whenever DTrace is usable.  (The CTF itself is in a non-loaded
section, but having dtrace_ctf.ko in the list of loaded modules means that we
can eliminate an annoying set of dtrace_ctf-related special case.)

We do this by introducing a dummy function dtrace_ctf_forceload() into the
dtrace_ctf module, which DTrace then calls: depmod will then arrange for
dtrace_ctf to be loaded when we need it.

Signed-off-by: Nick Alcock <nick.alcock@oracle.com>

diff --git a/kernel/dtrace/dtrace_ctf.c b/kernel/dtrace/dtrace_ctf.c
index a462fb062af07e22f4c898526a5fd21d451f0180..77ab087ed83b9fa4458e4a5c0ec569e9ace0804f 100644 (file)
--- a/kernel/dtrace/dtrace_ctf.c
+++ b/kernel/dtrace/dtrace_ctf.c
@@ -11,3 +11,9 @@ MODULE_AUTHOR("Nick Alcock <nick.alcock@oracle.com>");
 MODULE_DESCRIPTION("CTF container module, not for modprobing");
 MODULE_VERSION("v0.1");
 MODULE_LICENSE("GPL");
+
+void dtrace_ctf_forceload(void) {
+       /* nothing doing */
+}
+
+EXPORT_SYMBOL(dtrace_ctf_forceload);