Re: [patch 02/10] emm: notifier logic

[Christoph Lameter]

It may also be useful to allow invalidate_start() to fail in some contexts 
(try_to_unmap f.e., maybe if a certain flag is passed). This may allow the 
device to get out of tight situations (pending I/O f.e. or time out if 
there is no response for network communications). But then that 
complicates the API.

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