CVS commit: src/sys/arch/x86/x86

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

Module Name:    src
Committed By:   riastradh
Date:           Tue Dec  3 04:57:25 UTC 2019

Modified Files:
        src/sys/arch/x86/x86: bus_space.c

Log Message:
Skip fences in bus_space_barrier on I/O space.

I/O operations are issued in program order.  Not that I/O operations
are usually a performance bottleneck anyway, but maybe it is slightly
cheaper to avoid stalling on store buffers or pending loads, and
there's very little cost to the skipping criterion here.


To generate a diff of this commit:
cvs rdiff -u -r1.42 -r1.43 src/sys/arch/x86/x86/bus_space.c

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