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Make it possible to print more debugging information when (re)generating
a subsystem list.
Include parent inference details to the source code itself and add a
-debug flag to list the source files assigned to each subsystem.
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Remove the entity and match subpackages.
Regenerate the linux.go file.
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This lets us reduce the amount of code in parents.go.
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In the previous steps we eliminate some of the extracted subsystems. It
helps to have fewer contention while assigning the names.
As a result, we need to only rely on emails during parents
trasnformations.
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And regenerate the Linux rules file.
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Instead of just assigning parents, also remove small and highly
overlapping subsystems.
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For now, let's use a straightforward approach:
1) Extract all subsystems for each guilty path and syz reproducer.
2) If there are both parents and children in the list, remove parents.
3) Count the remaining subsystems.
4) Pick the ones that appear most often.
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For that, extract a coincidence count matrix from a path coverage, then
apply the following rule.
Subsystem A is a child of B if both hold true:
1) More than 2/3 of paths that relate to A also relate to B.
2) B covers more directory tree entities than A.
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