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| author | Stephen Hemminger <stephen@networkplumber.org> | 2018-09-14 09:10:16 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-09-25 20:33:24 +0200 |
| commit | 52a42c2a90226dc61c99bbd0cb096deeb52c334b (patch) | |
| tree | 5ed0c2c0e95fd17f12001d147442b278137be78f /drivers/uio | |
| parent | 800b932969c53c4044ff9f9fd1ee793a87fa8ef0 (diff) | |
| download | lwn-52a42c2a90226dc61c99bbd0cb096deeb52c334b.tar.gz lwn-52a42c2a90226dc61c99bbd0cb096deeb52c334b.zip | |
vmbus: keep pointer to ring buffer page
Avoid going from struct page to virt address (and back) by just
keeping pointer to the allocated pages instead of virt address.
Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/uio')
| -rw-r--r-- | drivers/uio/uio_hv_generic.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/uio/uio_hv_generic.c b/drivers/uio/uio_hv_generic.c index a08860260f55..ba67a5267557 100644 --- a/drivers/uio/uio_hv_generic.c +++ b/drivers/uio/uio_hv_generic.c @@ -130,11 +130,12 @@ static int hv_uio_ring_mmap(struct file *filp, struct kobject *kobj, = container_of(kobj, struct vmbus_channel, kobj); struct hv_device *dev = channel->primary_channel->device_obj; u16 q_idx = channel->offermsg.offer.sub_channel_index; + void *ring_buffer = page_address(channel->ringbuffer_page); dev_dbg(&dev->device, "mmap channel %u pages %#lx at %#lx\n", q_idx, vma_pages(vma), vma->vm_pgoff); - return vm_iomap_memory(vma, virt_to_phys(channel->ringbuffer_pages), + return vm_iomap_memory(vma, virt_to_phys(ring_buffer), channel->ringbuffer_pagecount << PAGE_SHIFT); } @@ -223,7 +224,7 @@ hv_uio_probe(struct hv_device *dev, /* mem resources */ pdata->info.mem[TXRX_RING_MAP].name = "txrx_rings"; pdata->info.mem[TXRX_RING_MAP].addr - = (uintptr_t)dev->channel->ringbuffer_pages; + = (uintptr_t)page_address(dev->channel->ringbuffer_page); pdata->info.mem[TXRX_RING_MAP].size = dev->channel->ringbuffer_pagecount << PAGE_SHIFT; pdata->info.mem[TXRX_RING_MAP].memtype = UIO_MEM_LOGICAL; |