On Wed, 30 May 2018, Herbert Xu wrote:

It doesn't explain it at all.  In fact I don't see why we neeed
three attempts, just do the GFP_NOFAIL as the second and final step.

Second attempt is reduced size only as we don't want to GFP_NOFAIL
if we can avoid it helping the allocator. We go from an arbitrary
allocation to the smallest possible allocation, if all that fails
ok lets use GFP_NOFAIL. I don't know how this is not clear...

Thanks,
Davidlohr