Thread (155 messages) 155 messages, 13 authors, 2016-04-14

Re: [PATCH v3 39/41] xen/events: use virt_xxx barriers

From: David Vrabel <hidden>
Date: 2016-01-11 11:12:16
Also in: linux-arch, linux-arm-kernel, linux-mips, linux-s390, linux-sh, linux-um, lkml, sparclinux

On 10/01/16 14:21, Michael S. Tsirkin wrote:
drivers/xen/events/events_fifo.c uses rmb() to communicate with the
other side.

For guests compiled with CONFIG_SMP, smp_rmb would be sufficient, so
rmb() here is only needed if a non-SMP guest runs on an SMP host.

Switch to the virt_rmb barrier which serves this exact purpose.

Pull in asm/barrier.h here to make sure the file is self-contained.

Suggested-by: David Vrabel <redacted>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: David Vrabel <redacted>

David
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