UbiquitousOS
/
OpenCloudOS-Kernel
mirror of https://gitee.com/OpenCloudOS/OpenCloudOS-Kernel.git
11
0
Fork 0
Code Issues Projects Releases Wiki Activity

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>
This commit is contained in:
Xie Yongji 2022-08-03 12:55:20 +08:00 committed by Michael S. Tsirkin
parent c32ee69312
commit 82eb46f94a
1 changed files with 4 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
drivers/vdpa/vdpa_user/iova_domain.c
View File

@ -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++;