Merge branch 'ipv6-data-races'

Eric Dumazet says:

====================
ipv6: round of data-races fixes

This series is inspired by one related syzbot report.

Many inet6_sk(sk) fields reads or writes are racy.

Move 1-bit fields to inet->inet_flags to provide
atomic safety. inet6_{test|set|clear|assign}_bit() helpers
could be changed later if we need to make room in inet_flags.

Also add missing READ_ONCE()/WRITE_ONCE() when
lockless readers need access to specific fields.

np->srcprefs will be handled separately to avoid merge conflicts
because a prior patch was posted for net tree.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

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