linuxkpi: remove invalid KASSERT from hash_add_rcu

hash_add_rcu asserted that the node's prev pointer was NULL in an
attempt to detect addition of a node already on a list, but the caller
is not req

linuxkpi: remove invalid KASSERT from hash_add_rcu

hash_add_rcu asserted that the node's prev pointer was NULL in an
attempt to detect addition of a node already on a list, but the caller
is not required to provide a zeroed node.

Reported in https://github.com/freebsd/drm-kmod/issues/282

Reviewed by: bz, manu
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D43645

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sys: Remove $FreeBSD$: two-line .h pattern

Remove /^\s*\*\n \*\s+\$FreeBSD\$$\n/

LinuxKPI: Implement linux/hashtable.h for FreeBSD.

This implementation uses the concurrency kit, CK, API directly which is
suitable for use with EPOCH(9) and RCU under FreeBSD.

No functional change

LinuxKPI: Implement linux/hashtable.h for FreeBSD.

This implementation uses the concurrency kit, CK, API directly which is
suitable for use with EPOCH(9) and RCU under FreeBSD.

No functional change intended.

The initial "linux/hash.h" code was obtained from DragonFlyBSD via
FreeBSD's drm-kmod in ports.

Differential Revision: https://reviews.freebsd.org/D35162
Reviewed by: bz@ and markj@
MFC after: 1 week
Sponsored by: NVIDIA Networking

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