I wonder if using systemtap could have found the problematic code quicker? (I've used stap a bit, but I'm not over-familiar with it, so genuine question)
Wow. I'd had to search LKML to find the patch, and I wondered why the article didn't seem to have a link. Turns out the article's CSS makes the link almost completely indistinguishable from regular text. Text uses dark grey (#3a3a3a), and links use black (#000000), with no decoration either.
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https://lkml.org/lkml/2015/10/12/427