At least for the subsystems maintained in the -tip tree there's a consistent pattern you can use to recover fixlets: the tip:*/urgent branches.
The current branches are:
core/urgent irq/urgent perf/urgent sched/urgent timers/urgent tracing/urgent x86/urgent
All the stuff separated out in the -tip urgent branches is directed towards Linus's current tree - and if it has a Cc: stable tag then it's directed towards earlier versions as well.
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