CVS commit: src/share/man/man9

["Taylor R Campbell" <riastradh%netbsd.org@localhost>]

Module Name:    src
Committed By:   riastradh
Date:           Fri Aug 12 13:24:37 UTC 2022

Modified Files:
        src/share/man/man9: bus_space.9

Log Message:
bus_space(9): Update barrier semantics to match reality and sense.

As proposed on tech-kern:
https://mail-index.netbsd.org/tech-kern/2022/07/16/msg028249.html

tl;dr:
- bus_space_barrier is needed only with prefetchable/cacheable.
- BUS_SPACE_BARRIER_READ is like membar_acquire.
- BUS_SPACE_BARRIER_WRITE is like membar_release.
- READ|WRITE is like membar_sync.


To generate a diff of this commit:
cvs rdiff -u -r1.53 -r1.54 src/share/man/man9/bus_space.9

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.