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| author | Zoltan HERPAI <wigyori@uid0.hu> | 2016-07-21 16:13:09 +0200 |
|---|---|---|
| committer | Zoltan HERPAI <wigyori@uid0.hu> | 2016-07-21 16:13:09 +0200 |
| commit | cd91ba788bddf420fbe2d85d75016c2f22cf8580 (patch) | |
| tree | c2a6e2d8ea34ec8cb0c5ce1c077fa09b64a3ea30 /target | |
| parent | 2be862b6fc3a9d1be0fec85af3133673946ad283 (diff) | |
| download | master-187ad058-cd91ba788bddf420fbe2d85d75016c2f22cf8580.tar.gz master-187ad058-cd91ba788bddf420fbe2d85d75016c2f22cf8580.tar.bz2 master-187ad058-cd91ba788bddf420fbe2d85d75016c2f22cf8580.zip | |
generic/4.4: backport virtio_ring patch for reverting weak barriers patch
Signed-off-by: Zoltan HERPAI <wigyori@uid0.hu>
Diffstat (limited to 'target')
| -rw-r--r-- | target/linux/generic/patches-4.4/150-virtio-revert_dma_wmb_rmb_weak_barriers.patch | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/target/linux/generic/patches-4.4/150-virtio-revert_dma_wmb_rmb_weak_barriers.patch b/target/linux/generic/patches-4.4/150-virtio-revert_dma_wmb_rmb_weak_barriers.patch new file mode 100644 index 0000000000..0abbefa44d --- /dev/null +++ b/target/linux/generic/patches-4.4/150-virtio-revert_dma_wmb_rmb_weak_barriers.patch @@ -0,0 +1,55 @@ +diff --git a/include/linux/virtio_ring.h b/include/linux/virtio_ring.h +index 8e50888..67e06fe 100644 +--- a/include/linux/virtio_ring.h ++++ b/include/linux/virtio_ring.h +@@ -21,20 +21,19 @@ + * actually quite cheap. + */ + ++#ifdef CONFIG_SMP + static inline void virtio_mb(bool weak_barriers) + { +-#ifdef CONFIG_SMP + if (weak_barriers) + smp_mb(); + else +-#endif + mb(); + } + + static inline void virtio_rmb(bool weak_barriers) + { + if (weak_barriers) +- dma_rmb(); ++ smp_rmb(); + else + rmb(); + } +@@ -42,10 +41,26 @@ static inline void virtio_rmb(bool weak_barriers) + static inline void virtio_wmb(bool weak_barriers) + { + if (weak_barriers) +- dma_wmb(); ++ smp_wmb(); + else + wmb(); + } ++#else ++static inline void virtio_mb(bool weak_barriers) ++{ ++ mb(); ++} ++ ++static inline void virtio_rmb(bool weak_barriers) ++{ ++ rmb(); ++} ++ ++static inline void virtio_wmb(bool weak_barriers) ++{ ++ wmb(); ++} ++#endif + + struct virtio_device; + struct virtqueue; |