Module Name: src
Committed By: pgoyette
Date: Fri May 12 22:12:23 UTC 2017
Modified Files:
src/sys/kern [prg-localcount2]: subr_localcount.c
Log Message:
When we're draining the localcount's references, transfer the local
CPU's reference count to the global total, and then zero it. Any
further calls to localcount_release() will adjust only the global
counter.
Avoids a race condition which depends on having localcount_release()
being aware of whether the local CPU's contribution has already been
accounted for. Thanks to Kengo NAKAHARA for bringing up the question,
and to riastradh@ for the solution.
To generate a diff of this commit:
cvs rdiff -u -r1.1.6.4 -r1.1.6.5 src/sys/kern/subr_localcount.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
