AcoSail/kernel_optimize_test
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virtio_ring: switch to dma_XX barriers for rpmsg

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virtio is using barriers to order memory accesses, thus
dma_wmb/rmb is a good match.

Before
[mst@tuck linux]$ size drivers/virtio/virtio_ring.o
   text    data     bss     dec     hex filename
  11392     820       0   12212    2fb4 drivers/virtio/virtio_ring.o

After
mst@tuck linux]$ size drivers/virtio/virtio_ring.o
   text    data     bss     dec     hex filename
  11284     820       0   12104    2f48 drivers/virtio/virtio_ring.o

Cc: Ohad Ben-Cohen <ohad@wizery.com>
Cc: Bjorn Andersson <bjorn.andersson@linaro.org>
Cc: linux-remoteproc@vger.kernel.org
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Michael S. Tsirkin 2018-04-19 20:29:41 +03:00
parent 29dcea8877
commit 55e49dc43a
1 changed files with 2 additions and 2 deletions
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4
include/linux/virtio_ring.h
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@ -35,7 +35,7 @@ static inline void virtio_rmb(bool weak_barriers)
if (weak_barriers)
virt_rmb();
else
rmb();
dma_rmb();
}
static inline void virtio_wmb(bool weak_barriers)
@ -43,7 +43,7 @@ static inline void virtio_wmb(bool weak_barriers)
if (weak_barriers)
virt_wmb();
else
wmb();
dma_wmb();
}
static inline void virtio_store_mb(bool weak_barriers,