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>

7 files changed, 31 insertions, 13 deletions

diff --git a/fs/nfs/Kconfig b/fs/nfs/Kconfig
index 7bce64c7060e..2a0e6c599147 100644
--- a/fs/nfs/Kconfig
+++ b/fs/nfs/Kconfig
@@ -144,3 +144,9 @@ config NFS_USE_KERNEL_DNS
 	depends on NFS_V4 && !NFS_USE_LEGACY_DNS
 	select DNS_RESOLVER
 	default y
+
+config NFS_DEBUG
+	bool
+	depends on NFS_FS && SUNRPC_DEBUG
+	select CRC32
+	default y
diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index 1a19f8d30c14..7bb4d13c1cd5 100644
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -1047,7 +1047,7 @@ struct nfs_fh *nfs_alloc_fhandle(void)
 	return fh;
 }
 
-#ifdef RPC_DEBUG
+#ifdef NFS_DEBUG
 /*
  * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle
  *                             in the same way that wireshark does
diff --git a/fs/nfs/mount_clnt.c b/fs/nfs/mount_clnt.c
index b37ca34af903..8e65c7f1f87c 100644
--- a/fs/nfs/mount_clnt.c
+++ b/fs/nfs/mount_clnt.c
@@ -16,7 +16,7 @@
 #include <linux/nfs_fs.h>
 #include "internal.h"
 
-#ifdef RPC_DEBUG
+#ifdef NFS_DEBUG
 # define NFSDBG_FACILITY	NFSDBG_MOUNT
 #endif
 
diff --git a/fs/nfs/nfsroot.c b/fs/nfs/nfsroot.c
index c4744e1d513c..cd3c910d2d12 100644
--- a/fs/nfs/nfsroot.c
+++ b/fs/nfs/nfsroot.c
@@ -104,7 +104,7 @@ static char nfs_export_path[NFS_MAXPATHLEN + 1] __initdata = "";
 /* server:export path string passed to super.c */
 static char nfs_root_device[NFS_MAXPATHLEN + 1] __initdata = "";
 
-#ifdef RPC_DEBUG
+#ifdef NFS_DEBUG
 /*
  * When the "nfsrootdebug" kernel command line option is specified,
  * enable debugging messages for NFSROOT.
diff --git a/include/linux/nfs_fs.h b/include/linux/nfs_fs.h
index 0a63ab2b5a76..8f27c2e36ddf 100644
--- a/include/linux/nfs_fs.h
+++ b/include/linux/nfs_fs.h
@@ -38,6 +38,13 @@
 
 #ifdef __KERNEL__
 
+/*
+ * Enable dprintk() debugging support for nfs client.
+ */
+#ifdef CONFIG_NFS_DEBUG
+# define NFS_DEBUG
+#endif
+
 #include <linux/in.h>
 #include <linux/mm.h>
 #include <linux/pagemap.h>
@@ -391,7 +398,7 @@ static inline void nfs_free_fhandle(const struct nfs_fh *fh)
 	kfree(fh);
 }
 
-#ifdef RPC_DEBUG
+#ifdef NFS_DEBUG
 extern u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh);
 static inline u32 nfs_display_fhandle_hash(const struct nfs_fh *fh)
 {
@@ -650,14 +657,6 @@ nfs_fileid_to_ino_t(u64 fileid)
 
 #ifdef __KERNEL__
 
-/*
- * Enable debugging support for nfs client.
- * Requires RPC_DEBUG.
- */
-#ifdef RPC_DEBUG
-# define NFS_DEBUG
-#endif
-
 # undef ifdebug
 # ifdef NFS_DEBUG
 #  define ifdebug(fac)		if (unlikely(nfs_debug & NFSDBG_##fac))
diff --git a/include/linux/sunrpc/debug.h b/include/linux/sunrpc/debug.h
index 6cb2517bcf75..9448eb5e426c 100644
--- a/include/linux/sunrpc/debug.h
+++ b/include/linux/sunrpc/debug.h
@@ -31,7 +31,7 @@
 /*
  * Enable RPC debugging/profiling.
  */
-#ifdef CONFIG_SYSCTL
+#ifdef CONFIG_SUNRPC_DEBUG
 #define  RPC_DEBUG
 #endif
 #ifdef CONFIG_TRACEPOINTS
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.