Your advise on debugging nfsclient code nfsvnops.c requested

Hi I am trying to debug the nfs client code nfsvnops.c. I have followed the instructions in http://www.freebsd.org/doc/en/books/developers-handbook/kerneldebug-online-gdb.html and http://docs.freebsd.org/doc/3.5-RELEASE/usr/share/doc/handbook/kernelconfig-building.html to build and install

Kernel build fails with nested extern declaration warning

Hello All Kindly excuse the trouble please. I am trying to compile a custom code I have written at the nfs layer and I am getting the following error /usr/src/sys/nfsclient/nfs_bio.c: In function 'nfs_read_disk': /usr/src/sys/nfsclient/nfs_bio.c:1832: warning: implicit declarati