tree 5993f96fd61ed3b39c41d6542be635ddb2140a38
parent a8031cb00e286600ea08bd00a6812dbfec412376
author Michael Ellerman <michael@ellerman.id.au> 1239658809 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> 1239660272 -0700

mm: add documentation describing what tsk->active_mm means vs tsk->mm

I'm sure everyone knows this, but I didn't, so I googled it, and found a
nice explanation from Linus.  Might be worth sticking in Documentation.

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>