Merge branch 'wireguard-fixes'

Jason A. Donenfeld says:

====================
wireguard fixes for 5.7-rc7

Hopefully these are the last fixes for 5.7:

1) A trivial bump in the selftest harness to support gcc-10.
   build.wireguard.com is still on gcc-9 but I'll probably switch to
   gcc-10 in the coming weeks.

2) A concurrency fix regarding userspace modifying the pre-shared key at
   the same time as packets are being processed, reported by Matt
   Dunwoodie.

3) We were previously clearing skb->hash on egress, which broke
   fq_codel, cake, and other things that actually make use of the flow
   hash for queueing, reported by Dave Taht and Toke Høiland-Jørgensen.

4) A fix for the increased memory usage caused by (3). This can be
   thought of as part of patch (3), but because of the separate
   reasoning and breadth of it I thought made it a bit cleaner to put in
   a standalone commit.

Fixes (2), (3), and (4) are -stable material.
====================

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

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