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tools/lguest: real barriers.

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Lguest guests are UP, but the host is probably SMP, so real barriers are
required in case the device thread and the guest are on different CPUs.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2013-07-02 15:35:14 +09:30
parent 8fd9a6365e
commit 0d69a65e97
1 changed files with 2 additions and 2 deletions
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4
tools/lguest/lguest.c
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@ -177,8 +177,8 @@ static struct termios orig_term;
* in precise order.
*/
#define wmb() __asm__ __volatile__("" : : : "memory")
#define rmb() __asm__ __volatile__("" : : : "memory")
#define mb() __asm__ __volatile__("" : : : "memory")
#define rmb() __asm__ __volatile__("lock; addl $0,0(%%esp)" : : : "memory")
#define mb() __asm__ __volatile__("lock; addl $0,0(%%esp)" : : : "memory")
/* Wrapper for the last available index. Makes it easier to change. */
#define lg_last_avail(vq) ((vq)->last_avail_idx)