CVS commit: src/sys/external/bsd/common/include/asm

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

Module Name:    src
Committed By:   riastradh
Date:           Sun Dec 19 12:25:05 UTC 2021

Modified Files:
        src/sys/external/bsd/common/include/asm: barrier.h

Log Message:
linux: Define mb/wmb/rmb for x86.

These are _not_ SMP barriers; on Linux they specifically mean
mfence/sfence/lfence.  Although membar_sync and mb agree, and
membar_consumer and rmb agree, membar_producer and wmb _do not_ agree
on x86 -- Linux's wmb is specifically sfence, which is important only
for unusual memory types, whereas our membar_producer is limited to
ordinary memory.


To generate a diff of this commit:
cvs rdiff -u -r1.8 -r1.9 src/sys/external/bsd/common/include/asm/barrier.h

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