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| author |   bluhm <bluhm@openbsd.org> | 2016-12-20 12:07:14 +0000 |
|---|---|---|
| committer | bluhm <bluhm@openbsd.org> | 2016-12-20 12:07:14 +0000 |
| commit | 298d98f11ad3925cf40f1eac6912f64e2f397b43 (patch) | |
| tree | 6c9b815a1cf70844e267711f5c3cb1356b2f7f8c | |
| parent | Add the u-boot arm64 architecture number and map it to "aarch64" to (diff) | |
| download | wireguard-openbsd-298d98f11ad3925cf40f1eac6912f64e2f397b43.tar.xz wireguard-openbsd-298d98f11ad3925cf40f1eac6912f64e2f397b43.zip | |
Put a write memory barrier into counters_enter(). This ensures
that the generation number increment is written before the function
returns and anything else is written.
OK patrick@ mpi@ dlg@
| -rw-r--r-- | sys/sys/percpu.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/sys/sys/percpu.h b/sys/sys/percpu.h index 356b471f0b4..3b45b7e308d 100644 --- a/sys/sys/percpu.h +++ b/sys/sys/percpu.h @@ -1,4 +1,4 @@ -/* $OpenBSD: percpu.h,v 1.4 2016/11/14 03:26:31 dlg Exp $ */ +/* $OpenBSD: percpu.h,v 1.5 2016/12/20 12:07:14 bluhm Exp $ */ /* * Copyright (c) 2016 David Gwynne <dlg@openbsd.org> @@ -122,6 +122,7 @@ counters_enter(struct counters_ref *ref, struct cpumem *cm) ref->c = cpumem_enter(cm); #ifdef MULTIPROCESSOR ref->g = ++(*ref->c); /* make the generation number odd */ + membar_producer(); return (ref->c + 1); #else return (ref->c); |