> +#ifdef CONFIG_MMU
quoted text
>  	.mmap		= nfs_file_mmap,
> +#else
> +	.mmap		= generic_file_mmap,
> +#endif

This is with almost 100% chance wrong.  It might get you a kernel that
compiles but none where mmap actually works.  Just disable mmap on nfs
for mmu-less systems until someone hacks up a proper mmu-less mmap
method for nfs.
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