[PATCH 17/17] samples: Use memcpy_to/from_page()

[ira . weiny]

From: Ira Weiny <ira.we...@intel.com>

Remove kmap/mem*()/kunmap pattern and use memcpy_to/from_page()

Cc: Kirti Wankhede <kwankh...@nvidia.com>
Signed-off-by: Ira Weiny <ira.we...@intel.com>
---
 samples/vfio-mdev/mbochs.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/samples/vfio-mdev/mbochs.c b/samples/vfio-mdev/mbochs.c
index e03068917273..54fe04f63c66 100644
--- a/samples/vfio-mdev/mbochs.c
+++ b/samples/vfio-mdev/mbochs.c
@@ -30,6 +30,7 @@
 #include <linux/iommu.h>
 #include <linux/sysfs.h>
 #include <linux/mdev.h>
+#include <linux/pagemap.h>
 #include <linux/pci.h>
 #include <linux/dma-buf.h>
 #include <linux/highmem.h>
@@ -442,7 +443,6 @@ static ssize_t mdev_access(struct mdev_device *mdev, char 
*buf, size_t count,
        struct device *dev = mdev_dev(mdev);
        struct page *pg;
        loff_t poff;
-       char *map;
        int ret = 0;
 
        mutex_lock(&mdev_state->ops_lock);
@@ -479,12 +479,10 @@ static ssize_t mdev_access(struct mdev_device *mdev, char 
*buf, size_t count,
                pos -= MBOCHS_MMIO_BAR_OFFSET;
                poff = pos & ~PAGE_MASK;
                pg = __mbochs_get_page(mdev_state, pos >> PAGE_SHIFT);
-               map = kmap(pg);
                if (is_write)
-                       memcpy(map + poff, buf, count);
+                       memcpy_to_page(pg, poff, buf, count);
                else
-                       memcpy(buf, map + poff, count);
-               kunmap(pg);
+                       memcpy_from_page(buf, pg, poff, count);
                put_page(pg);
 
        } else {
-- 
2.28.0.rc0.12.gb6a658bd00c9