diff options
| -rw-r--r-- | Documentation/lguest/lguest.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/Documentation/lguest/lguest.c b/Documentation/lguest/lguest.c index 1a2b906a3ae6..1e31d1ec12a3 100644 --- a/Documentation/lguest/lguest.c +++ b/Documentation/lguest/lguest.c @@ -182,9 +182,10 @@ struct virtqueue /* Remember the arguments to the program so we can "reboot" */ static char **main_args; -/* Since guest is UP and we don't run at the same time, we don't need barriers. - * But I include them in the code in case others copy it. */ -#define wmb() +/* We have to be careful with barriers: our devices are all run in separate + * threads and so we need to make sure that changes visible to the Guest happen + * in precise order. */ +#define wmb() __asm__ __volatile__("" : : : "memory") /* Convert an iovec element to the given type. * |