SUNRPC: Update help Kconfig text

Clean up: refresh the help text for Kconfig items related to the sunrpc
module.  Remove obsolete URLs, and make the language consistent among
the options.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

diff --git a/fs/Kconfig b/fs/Kconfig
index 55c1a03..8320185 100644 (file)
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -1757,15 +1757,32 @@ config SUNRPC_XPRT_RDMA
        tristate
        depends on SUNRPC && INFINIBAND && EXPERIMENTAL
        default SUNRPC && INFINIBAND
+       help
+         This option enables an RPC client transport capability that
+         allows the NFS client to mount servers via an RDMA-enabled
+         transport.
+
+         To compile RPC client RDMA transport support as a module,
+         choose M here: the module will be called xprtrdma.
+
+         If unsure, say N.
 
 config SUNRPC_BIND34
        bool "Support for rpcbind versions 3 & 4 (EXPERIMENTAL)"
        depends on SUNRPC && EXPERIMENTAL
        help
-         Provides kernel support for querying rpcbind servers via versions 3
-         and 4 of the rpcbind protocol.  The kernel automatically falls back
-         to version 2 if a remote rpcbind service does not support versions
-         3 or 4.
+         RPC requests over IPv6 networks require support for larger
+         addresses when performing an RPC bind.  Sun added support for
+         IPv6 addressing by creating two new versions of the rpcbind
+         protocol (RFC 1833).
+
+         This option enables support in the kernel RPC client for
+         querying rpcbind servers via versions 3 and 4 of the rpcbind
+         protocol.  The kernel automatically falls back to version 2
+         if a remote rpcbind service does not support versions 3 or 4.
+         By themselves, these new versions do not provide support for
+         RPC over IPv6, but the new protocol versions are necessary to
+         support it.
 
          If unsure, say N to get traditional behavior (version 2 rpcbind
          requests only).
@@ -1779,12 +1796,13 @@ config RPCSEC_GSS_KRB5
        select CRYPTO_DES
        select CRYPTO_CBC
        help
-         Provides for secure RPC calls by means of a gss-api
-         mechanism based on Kerberos V5. This is required for
-         NFSv4.
+         Choose Y here to enable Secure RPC using the Kerberos version 5
+         GSS-API mechanism (RFC 1964).
 
-         Note: Requires an auxiliary userspace daemon which may be found on
-               http://www.citi.umich.edu/projects/nfsv4/
+         Secure RPC calls with Kerberos require an auxiliary user-space
+         daemon which may be found in the Linux nfs-utils package
+         available from http://linux-nfs.org/.  In addition, user-space
+         Kerberos support should be installed.
 
          If unsure, say N.
 
@@ -1798,11 +1816,12 @@ config RPCSEC_GSS_SPKM3
        select CRYPTO_CAST5
        select CRYPTO_CBC
        help
-         Provides for secure RPC calls by means of a gss-api
-         mechanism based on the SPKM3 public-key mechanism.
+         Choose Y here to enable Secure RPC using the SPKM3 public key
+         GSS-API mechansim (RFC 2025).
 
-         Note: Requires an auxiliary userspace daemon which may be found on
-               http://www.citi.umich.edu/projects/nfsv4/
+         Secure RPC calls with SPKM3 require an auxiliary userspace
+         daemon which may be found in the Linux nfs-utils package
+         available from http://linux-nfs.org/.
 
          If unsure, say N.