[PATCH -next 2/3] xen: balloon: Replaced simple_strtoull() with kstrtoull()

[Chen Huang <chenhuang5@xxxxxxxxxx>]

The simple_strtoull() function is deprecated in some situation, since
it does not check for the range overflow, use kstrtoull() instead.

Signed-off-by: Chen Huang <chenhuang5@xxxxxxxxxx>
---
 drivers/xen/xen-balloon.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/xen/xen-balloon.c b/drivers/xen/xen-balloon.c
index a8d24433c8e9..1fba838963d2 100644
--- a/drivers/xen/xen-balloon.c
+++ b/drivers/xen/xen-balloon.c
@@ -163,13 +163,16 @@ static ssize_t store_target_kb(struct device *dev,
                               const char *buf,
                               size_t count)
 {
-       char *endchar;
+       ssize_t ret;
        unsigned long long target_bytes;
 
        if (!capable(CAP_SYS_ADMIN))
                return -EPERM;
 
-       target_bytes = simple_strtoull(buf, &endchar, 0) * 1024;
+       ret = kstrtoull(buf, 0, &target_bytes);
+       if (ret)
+               return ret;
+       target_bytes *= 1024;
 
        balloon_set_new_target(target_bytes >> PAGE_SHIFT);
 
-- 
2.25.1