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

[ira . weiny]

From: Ira Weiny <ira.weiny@xxxxxxxxx>

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

Cc: Kirti Wankhede <kwankhede@xxxxxxxxxx>
Signed-off-by: Ira Weiny <ira.weiny@xxxxxxxxx>
---
 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