melifaro e9f6263cd3 Improve logic besides net.bpf.optimize_writers.
Direct bpf(4) consumers should now work fine with this tunable turned on.
In fact, the only case when optimized_writers can change program
behavior is direct bpf(4) consumer setting its read filter to
catch-all one.

MFC after:	2 weeks
Sponsored by:	Yandex LLC
2014-06-11 11:27:44 +00:00
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