On Wed, 27 Jun 2012, Glauber Costa wrote:

quoted

quoted

Nothing, but I also don't see how to prevent that.

You can test for current->flags & PF_KTHREAD following the check for
in_interrupt() and return true, it's what you were trying to do with the
check for !current->mm.

am I right to believe that if not in interrupt context - already ruled out -
and !(current->flags & PF_KTHREAD), I am guaranteed to have a mm context, and
thus, don't need to test against it ?

No, because an mm may have been detached in the exit path by running 
exit_mm().  We'd certainly hope that there are no slab allocations 
following that point, though, but you'd still need to test current->mm.

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