Remove $FreeBSD$: two-line .h pattern

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

spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD

The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch
up to that fact and revert to their recommended match of

spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD

The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch
up to that fact and revert to their recommended match of BSD-2-Clause.

Discussed with: pfg
MFC After: 3 days
Sponsored by: Netflix

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tools/uma/smrstress: fix kthread exit

By convention, kernel threads must call kthread_exit() instead of
blindly returning from the thread function. We have some safety measure
in fork_exit(), which

tools/uma/smrstress: fix kthread exit

By convention, kernel threads must call kthread_exit() instead of
blindly returning from the thread function. We have some safety measure
in fork_exit(), which checks for the P_KPROC p_flag and does
kthread_exit() for kernel thread that forgot to do it itself.

But this workaround only works for kernel threads belonging to the
kernel process. If a kernel thread is attached to the normal process
with live userspace, and does not call kthread_exit(), then the
workaround is not activated, and for amd64 at least, the return from the
thread function/fork_exit() results in the return to userspace with the
copy of frame from the thread that did kthread_add().

Practically for smrstress, this destroys the user stack of the still
active frame in the other thread, which was the caller of kthread_add().

Fix it by adding kthread_exit() to the thread function.

Reported and tested by: pho
Reviewed by: markj
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D35999

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MFH

Sponsored by: Rubicon Communications, LLC (netgate.com)

Merge ^/head r363739 through r363986.

Fix the smrstress build after r358400.

Reported by: pho

Merge ^/head r357350 through r357367.

smrstress: Add 'publishing' fences to operations on smrs_current.

Reported and tested by: andrew
Reviewed by: jeff
Sponsored by: The FreeBSD Foundation
Differential revision: https://reviews.freebsd

smrstress: Add 'publishing' fences to operations on smrs_current.

Reported and tested by: andrew
Reviewed by: jeff
Sponsored by: The FreeBSD Foundation
Differential revision: https://reviews.freebsd.org/D23440

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Merge ^/head r357270 through r357349.

Implement a simple UMA SMR stress testing tool.