Yes, perhaps we could do something smarter - I wasn't even sure it
was possible to hit any more (still waiting to hear back from
Steve Hirsch!)
The idea is that in this rare case, shrink_cache() will at
some later time revisit the page and again try to remove its
buffers, and will succeed. It's still on the LRU.
We definitely need to kill the printk(), but I really want
to get to test this code path locally.
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