net: Explicitly initialize u64_stats_sync structures for lockdep

In order to enable lockdep on seqcount/seqlock structures, we
must explicitly initialize any locks.

The u64_stats_sync structure, uses a seqcount, and thus we need
to introduce a u64_stats_init() function and use it to initialize
the structure.

This unfortunately adds a lot of fairly trivial initialization code
to a number of drivers. But the benefit of ensuring correctness makes
this worth while.

Because these changes are required for lockdep to be enabled, and the
changes are quite trivial, I've not yet split this patch out into 30-some
separate patches, as I figured it would be better to get the various
maintainers thoughts on how to best merge this change along with
the seqcount lockdep enablement.

Feedback would be appreciated!

Signed-off-by: John Stultz <[email protected]>
Acked-by: Julian Anastasov <[email protected]>
Signed-off-by: Peter Zijlstra <[email protected]>
Cc: Alexey Kuznetsov <[email protected]>
Cc: "David S. Miller" <[email protected]>
Cc: Eric Dumazet <[email protected]>
Cc: Hideaki YOSHIFUJI <[email protected]>
Cc: James Morris <[email protected]>
Cc: Jesse Gross <[email protected]>
Cc: Mathieu Desnoyers <[email protected]>
Cc: "Michael S. Tsirkin" <[email protected]>
Cc: Mirko Lindner <[email protected]>
Cc: Patrick McHardy <[email protected]>
Cc: Roger Luethi <[email protected]>
Cc: Rusty Russell <[email protected]>
Cc: Simon Horman <[email protected]>
Cc: Stephen Hemminger <[email protected]>
Cc: Steven Rostedt <[email protected]>
Cc: Thomas Petazzoni <[email protected]>
Cc: Wensong Zhang <[email protected]>
Cc: [email protected]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>

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