Import CK as of 21d3e319407d19dece16ee317c757ffc54a452bc, which makes its
sparcv9 atomics compatible with the FreeBSD kernel by using instructions
which access the appropriate address space.
Atomic o

Import CK as of 21d3e319407d19dece16ee317c757ffc54a452bc, which makes its
sparcv9 atomics compatible with the FreeBSD kernel by using instructions
which access the appropriate address space.
Atomic operations within the kernel must access the nucleus address space
instead of the default primary one. Without this change but the increased
use of CK in the kernel, machines started to panic after some minutes of
uptime due to an unresolvable fault in ck_pr_cas_64_value().

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Import CK as of commit b19ed4c6a56ec93215ab567ba18ba61bf1cfbac8
It should fix ck_pr_[load|store]_ptr on mips and riscv, make sure no
*fence instructions are used on i386, as older cpus don't support

Import CK as of commit b19ed4c6a56ec93215ab567ba18ba61bf1cfbac8
It should fix ck_pr_[load|store]_ptr on mips and riscv, make sure no
*fence instructions are used on i386, as older cpus don't support it, and
make sure we don't rely on gcc builtins that can lead to calls to
libatomic when linked with -O0.

MFC after: 1 week

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Import Concurrency Kit in the kernel.
CK is a toolkit providing different lockfree algorithms/data structures.
More information can be found here : www.concurrencykit.org