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authorStephen Hemminger <stephen@networkplumber.org>2018-09-14 19:10:16 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-09-25 21:33:24 +0300
commit52a42c2a90226dc61c99bbd0cb096deeb52c334b (patch)
tree5ed0c2c0e95fd17f12001d147442b278137be78f /drivers/uio
parent800b932969c53c4044ff9f9fd1ee793a87fa8ef0 (diff)
downloadlinux-52a42c2a90226dc61c99bbd0cb096deeb52c334b.tar.xz
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.c5
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;