>> why this change?
>>
>>   -struct vm_map *buf_map;
>>   +static struct vm_map *buf_map;
>
>Ah, forgot that in the commit message.  Nothing outside of vfs_bio.c 
>references buf_map.  So there is no reason to export it.

well...

>> i'd prefer if this particular change was reverted..
>
>Why?  Debuggers (including DDB) can still find the symbol.

that may be, but kvm_nlist() doesn't find it, so pmap(1) reports it as
a "(submap)" instead of actually telling you it's the "buf_map".

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