LinuxKPI: Add smp_store_release and smp_load_acquire functions

Sponsored by: Serenity Cyber Security, LLC
MFC after: 1 week
Reviewed by: manu
Differential Revision: https://reviews.freebsd.org/D4561

LinuxKPI: Add smp_store_release and smp_load_acquire functions

Sponsored by: Serenity Cyber Security, LLC
MFC after: 1 week
Reviewed by: manu
Differential Revision: https://reviews.freebsd.org/D45611

(cherry picked from commit 597ffdc1d3503110165dd57685c29da64386a7db)

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linuxkpi: Fix set_memory_*

set_memory_* is currently implemented using PHYS_TO_DMAP but not all
architectures have a DMAP. Looking at how this function is used the
given address isn't physical but

linuxkpi: Fix set_memory_*

set_memory_* is currently implemented using PHYS_TO_DMAP but not all
architectures have a DMAP. Looking at how this function is used the
given address isn't physical but virtual so the PHYS_TO_DMAP call can
simply be removed.

Also cast numpages before shifting it to avoid overflow.

Reviewed by: kib, markj
MFC after: 3 days
Differential Revision: https://reviews.freebsd.org/D45057

(cherry picked from commit 7206f7c619912bdd4d54dd539824733eae50c3a9)

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