make headers_install broken for ARCH=m68k in 2.6.29-rc7.

[Rob Landley <rob@landley.net>]

So I'm doing this:

make ARCH=m68k headers_install INSTALL_HDR_PATH=walrus

And it doesn't install unistd_mm.h which is included from asm/unistd.h.  (The 
file is there in arch/m68k/include/asm/unistd_mm.h, it just doesn't get 
installed.  So any code that #includes <asm/unistd.h> results in a file not 
found error for the other one, which is essentially just a wrapper.)

I don't understand what the code's currently doing here well enough to fix it, 
specifically where does this file list come from?  The file  
arch/m68k/include/asm/Kbuild is adding "cachectl.h" to header-y, but there are 
31 files getting installed from that directory and only one in there.  If the 
list was just the contents of the directory, then unistd_mm.h (and 
unistd_no.h) would get installed, but they don't.  I could add those two to 
the Kbuild file after cachectl.h, but is that the _right_ fix?  Where are the 
other 31 identified?  (Is it getting a listing of some _other_ directory?)

Confused,

Rob