Alison Schofield [off-list ref] wrote:

+void mktme_map_set_keyid(int keyid, unsigned int serial)
+{
+	mktme_map->serial[keyid] = serial;
+	mktme_map->mapped_keyids++;
+}

It appears that 'serial' should be key_serial_t.

Note that you *aren't* allowed to cache key serial numbers inside the kernel.
You must cache the struct key * instead and hold a reference to the key.  This
will prevent the key from being destroyed whilst it is in use.

David