hdparm utilizes shared memory for no good reason ?

[Mike Frysinger]

was trying to use `hdparm -t` on a uClinux host when it failed with:
could not allocate sharedmem buf

this is because hdparm uses shm* functions to get a buffer of memory ... but 
afaict, there's no reason a buffer created on the stack/heap wouldnt work 
just as well

could someone enlighten me as to why the shm* stuff is needed ?
-mike
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