CVS commit: src/sys/sys

["Ryota Ozaki" <ozaki-r%netbsd.org@localhost>]

Module Name:    src
Committed By:   ozaki-r
Date:           Fri Feb 16 07:11:50 UTC 2018

Modified Files:
        src/sys/sys: lwp.h

Log Message:
Add missing barriers to curlwp_bind and curlwp_bindx

The barriers prevent the instruction of setting/clearing the LP_BOUND flag
from reordering over where we want to prevent LWP migrations.

Note that the fix doesn't mean that there was a race condition.  For now the API
is used only for psref and the combination use of them doesn't need the
barriers(*).

(*) https://mail-index.netbsd.org/tech-kern/2018/02/15/msg023101.html

Pointed out by Mateusz Guzik


To generate a diff of this commit:
cvs rdiff -u -r1.177 -r1.178 src/sys/sys/lwp.h

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