param: fix module param locks when !CONFIG_SYSFS.

As Dan Streetman points out, the entire point of locking for is to
stop sysfs accesses, so they're elided entirely in the !SYSFS case.

Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

1 files changed, 2 insertions, 0 deletions

diff --git a/include/linux/module.h b/include/linux/module.h
index 6ba0e87fa804..46efa1c9de60 100644
--- a/include/linux/module.h
+++ b/include/linux/module.h
@@ -240,7 +240,9 @@ struct module {
         unsigned int num_syms;
 
         /* Kernel parameters. */
+#ifdef CONFIG_SYSFS
         struct mutex param_lock;
+#endif
         struct kernel_param *kp;
         unsigned int num_kp;