On 04/27/2016 10:14 AM, Hugh Dickins wrote:
It's rather horrible that compaction.c uses functions in page_alloc.c which skip doing some of the things we expect to be done: the non-debug preparation tends to get noticed, but the debug options overlooked. We can expect more problems of this kind in future: someone will add yet another debug prep line in page_alloc.c, and at first nobody will notice that it's also needed in compaction.c.
Point taken, I'll try to come up with more maintainable solution next time I attempt the isolate_freepages_direct() approach. Sorry about the troubles.
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