Re: [patch 9/9] mm: fix pagecache write deadlocks

[Nick Piggin]

On Tue, Feb 06, 2007 at 06:49:05AM +0100, Nick Piggin wrote:
> > - If the get_user() doesn't fault, and if we're copying from and to the
> >   same page, we know that we've locked it, so nobody will be able to unmap
> >   it while we're copying from it.
> > 
> > Close, but no cigar!  This is still vulnerable to Hugh's ab/ba deadlock
> > scenario.
> 
> Yes I considered this too. Hard isn't it?

BTW, there are two different abba deadlocks. It's all documented in the
patch 9/9 description.
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