My guess is "Get Free Page" (with various qualifier suffixes, i.e. GFP_KERNEL, GFP_ATOMIC, GFP_DMA, etc.).
It's strange that, after nearly an hour of grepping files throughout the entire Linux source tree, I was unable to come up with a meaning. My search took me all over the mm/, include/linux/, Documentation/, and kernel/ directories, but to no avail. The meaning of GFP_KERNEL via a Google search (going five pages deep) was equally elusive!
I suppose there are many kernel developers out there who know its true meaning whilst snickering over my frustrated search...
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