[patch 0/6] remove dependency on __GFP_NOFAIL for failable allocations

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This patchset removes __GFP_NOFAIL from various allocations when those 
callers have error handling or the subsystem doesn't absolutely require
success.

This is the first phase of two for the total removal of __GFP_NOFAIL:
this patchset is intended to fix obvious users of __GFP_NOFAIL that are
already failable or otherwise unnecessary.  The second phase will replace
__GFP_NOFAIL with a different gfp which will use all of the page
allocator's resources (direct reclaim, compaction, and the oom killer)
to free memory but not infinitely loop in the allocator itself.

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