kmalloc_slab mgt field unused

Matthew Dillon dillon at
Tue May 18 16:54:45 PDT 2021

Yah, originally I was going to have a back-pointer from the slab but it
turned out to be unnecessary.  I'll change it to 'void *unused01' so the
structure size doesn't change.  And I might as well keep the bmap[] field
16-byte aligned.

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