warning: the frame size of 1040 bytes is larger than 1024 bytes

I get this when I build 3.4.0-rc7 plus blklayout patches:

CC [M] fs/nfs/nfs4xdr.o
/home/rees/l/pnfs/linux/fs/nfs/nfs4xdr.c: In function ‘encode_exchange_id’:
/home/rees/l/pnfs/linux/fs/nfs/nfs4xdr.c:1719:1: warning: the frame size of 1040 bytes is larger than 1024 bytes [-Wframe-larger-than=]