vduse: Use memcpy_{to,from}_page() in do_bounce()

kmap_atomic() is being deprecated in favor of kmap_local_page().

The use of kmap_atomic() in do_bounce() is all thread local therefore
kmap_local_page() is a sufficient replacement.

Convert to kmap_local_page() but, instead of open coding it,
use the helpers memcpy_to_page() and memcpy_from_page().

Signed-off-by: Xie Yongji <xieyongji@bytedance.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Reviewed-by: Muchun Song <songmuchun@bytedance.com>
Message-Id: <20220803045523.23851-3-xieyongji@bytedance.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

diff --git a/drivers/vdpa/vdpa_user/iova_domain.c b/drivers/vdpa/vdpa_user/iova_domain.c
index bca1f0b..50d7c08 100644 (file)
--- a/drivers/vdpa/vdpa_user/iova_domain.c
+++ b/drivers/vdpa/vdpa_user/iova_domain.c
@@ -138,18 +138,17 @@ static void do_bounce(phys_addr_t orig, void *addr, size_t size,
 {
        unsigned long pfn = PFN_DOWN(orig);
        unsigned int offset = offset_in_page(orig);
-       char *buffer;
+       struct page *page;
        unsigned int sz = 0;
 
        while (size) {
                sz = min_t(size_t, PAGE_SIZE - offset, size);
 
-               buffer = kmap_atomic(pfn_to_page(pfn));
+               page = pfn_to_page(pfn);
                if (dir == DMA_TO_DEVICE)
-                       memcpy(addr, buffer + offset, sz);
+                       memcpy_from_page(addr, page, offset, sz);
                else
-                       memcpy(buffer + offset, addr, sz);
-               kunmap_atomic(buffer);
+                       memcpy_to_page(page, offset, addr, sz);
 
                size -= sz;
                pfn++;