SUNRPC/NFS: Add Kbuild dependencies for NFS_DEBUG/RPC_DEBUG

This allows us to turn on/off the dprintk() debugging interfaces for
those distributions that don't ship the 'rpcdebug' utility.
It also allows us to add Kbuild dependencies. Specifically, we already
know that dprintk() in general relies on CONFIG_SYSCTL. Now it turns out
that the NFS dprintks depend on CONFIG_CRC32 after we added support
for the filehandle hash.

Reported-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 13 insertions, 0 deletions

diff --git a/net/sunrpc/Kconfig b/net/sunrpc/Kconfig
index ffd243d09188..9fe8857d8d59 100644
--- a/net/sunrpc/Kconfig
+++ b/net/sunrpc/Kconfig
@@ -39,3 +39,16 @@ config RPCSEC_GSS_KRB5
           Kerberos support should be installed.
 
           If unsure, say Y.
+
+config SUNRPC_DEBUG
+        bool "RPC: Enable dprintk debugging"
+        depends on SUNRPC && SYSCTL
+        help
+          This option enables a sysctl-based debugging interface
+          that is be used by the 'rpcdebug' utility to turn on or off
+          logging of different aspects of the kernel RPC activity.
+
+          Disabling this option will make your kernel slightly smaller,
+          but makes troubleshooting NFS issues significantly harder.
+
+          If unsure, say Y.