K 10
svn:author
V 6
kevans
K 8
svn:date
V 27
2021-10-06T19:47:09.559603Z
K 7
svn:log
V 479
mips: fcmpset: do not spin on sc failure

For ll/sc architectures, atomic(9) allows failure modes where *old == val
due to write failure and callers should compensate for this. Do not retry on
failure, just leave 0 in ret and fail the operation if we couldn't sc it.
This lets the caller determine if it should retry or not.

(cherry picked from commit 22c2c971a614a72875787e0fd0001906451ee245)

Git Hash:   5bf3f2498adea0087a3ac1e3eaffdfc412b9dfe3
Git Author: kevans@FreeBSD.org
END