[PATCH] xen: gntalloc.c: Convert kmap() to kmap_local_page()

[Alaa Mohamed <eng.alaamohamedsoliman.am@xxxxxxxxx>]

The use of kmap() is being deprecated in favor of kmap_local_page()
where it is feasible.

With kmap_local_page(), the mapping is per thread, CPU local and not
globally visible. Therefore __del_gref() is a function
where the use of kmap_local_page() in place of kmap() is correctly
suited.

Signed-off-by: Alaa Mohamed <eng.alaamohamedsoliman.am@xxxxxxxxx>
---
 drivers/xen/gntalloc.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/xen/gntalloc.c b/drivers/xen/gntalloc.c
index 4849f94372a4..55acb32842a3 100644
--- a/drivers/xen/gntalloc.c
+++ b/drivers/xen/gntalloc.c
@@ -178,9 +178,9 @@ static void __del_gref(struct gntalloc_gref *gref)
        unsigned long addr;
 
        if (gref->notify.flags & UNMAP_NOTIFY_CLEAR_BYTE) {
-               uint8_t *tmp = kmap(gref->page);
+               uint8_t *tmp = kmap_local_page(gref->page);
                tmp[gref->notify.pgoff] = 0;
-               kunmap(gref->page);
+               kunmap_local(tmp);
        }
        if (gref->notify.flags & UNMAP_NOTIFY_SEND_EVENT) {
                notify_remote_via_evtchn(gref->notify.event);
-- 
2.35.2