mm: add documentation describing what tsk->active_mm means vs tsk->mm
authorMichael Ellerman <michael@ellerman.id.au>
Mon, 13 Apr 2009 21:40:09 +0000 (14:40 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Mon, 13 Apr 2009 22:04:32 +0000 (15:04 -0700)
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>

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