CVS commit: src

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

Module Name:    src
Committed By:   riastradh
Date:           Sat Apr  9 12:07:01 UTC 2022

Modified Files:
        src/common/lib/libc/arch/i386/atomic: atomic.S
        src/common/lib/libc/arch/x86_64/atomic: atomic.S
        src/sys/arch/amd64/include: frameasm.h
        src/sys/arch/i386/include: frameasm.h
        src/sys/arch/x86/x86: patch.c

Log Message:
x86: Every load is a load-acquire, so membar_consumer is a noop.

lfence is only needed for MD logic, such as operations on I/O memory
rather than normal cacheable memory, or special instructions like
RDTSC -- never for MI synchronization between threads/CPUs.  No need
for hot-patching to do lfence here.

(The x86_lfence function might reasonably be patched on i386 to do
lfence for MD logic, but it isn't now and this doesn't change that.)


To generate a diff of this commit:
cvs rdiff -u -r1.30 -r1.31 src/common/lib/libc/arch/i386/atomic/atomic.S
cvs rdiff -u -r1.23 -r1.24 src/common/lib/libc/arch/x86_64/atomic/atomic.S
cvs rdiff -u -r1.53 -r1.54 src/sys/arch/amd64/include/frameasm.h
cvs rdiff -u -r1.33 -r1.34 src/sys/arch/i386/include/frameasm.h
cvs rdiff -u -r1.49 -r1.50 src/sys/arch/x86/x86/patch.c

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