xen: replace strict_strtoul() with kstrtoul()

The usage of strict_strtoul() is not preferred, because
strict_strtoul() is obsolete. Thus, kstrtoul() should be
used.
Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

drivers/xen/xen-selfballoon.c

@@ -265,8 +265,10 @@ static ssize_t store_selfballooning(struct device *dev,
 	if (!capable(CAP_SYS_ADMIN))
 		return -EPERM;
 
-	err = strict_strtoul(buf, 10, &tmp);
-	if (err || ((tmp != 0) && (tmp != 1)))
+	err = kstrtoul(buf, 10, &tmp);
+	if (err)
+		return err;
+	if ((tmp != 0) && (tmp != 1))
 		return -EINVAL;
 
 	xen_selfballooning_enabled = !!tmp;
@@ -292,8 +294,10 @@ static ssize_t store_selfballoon_interval(struct device *dev,
 
 	if (!capable(CAP_SYS_ADMIN))
 		return -EPERM;
-	err = strict_strtoul(buf, 10, &val);
-	if (err || val == 0)
+	err = kstrtoul(buf, 10, &val);
+	if (err)
+		return err;
+	if (val == 0)
 		return -EINVAL;
 	selfballoon_interval = val;
 	return count;
@@ -314,8 +318,10 @@ static ssize_t store_selfballoon_downhys(struct device *dev,
 
 	if (!capable(CAP_SYS_ADMIN))
 		return -EPERM;
-	err = strict_strtoul(buf, 10, &val);
-	if (err || val == 0)
+	err = kstrtoul(buf, 10, &val);
+	if (err)
+		return err;
+	if (val == 0)
 		return -EINVAL;
 	selfballoon_downhysteresis = val;
 	return count;
@@ -337,8 +343,10 @@ static ssize_t store_selfballoon_uphys(struct device *dev,
 
 	if (!capable(CAP_SYS_ADMIN))
 		return -EPERM;
-	err = strict_strtoul(buf, 10, &val);
-	if (err || val == 0)
+	err = kstrtoul(buf, 10, &val);
+	if (err)
+		return err;
+	if (val == 0)
 		return -EINVAL;
 	selfballoon_uphysteresis = val;
 	return count;
@@ -360,8 +368,10 @@ static ssize_t store_selfballoon_min_usable_mb(struct device *dev,
 
 	if (!capable(CAP_SYS_ADMIN))
 		return -EPERM;
-	err = strict_strtoul(buf, 10, &val);
-	if (err || val == 0)
+	err = kstrtoul(buf, 10, &val);
+	if (err)
+		return err;
+	if (val == 0)
 		return -EINVAL;
 	selfballoon_min_usable_mb = val;
 	return count;
@@ -384,8 +394,10 @@ static ssize_t store_selfballoon_reserved_mb(struct device *dev,
 
 	if (!capable(CAP_SYS_ADMIN))
 		return -EPERM;
-	err = strict_strtoul(buf, 10, &val);
-	if (err || val == 0)
+	err = kstrtoul(buf, 10, &val);
+	if (err)
+		return err;
+	if (val == 0)
 		return -EINVAL;
 	selfballoon_reserved_mb = val;
 	return count;
@@ -410,8 +422,10 @@ static ssize_t store_frontswap_selfshrinking(struct device *dev,
 
 	if (!capable(CAP_SYS_ADMIN))
 		return -EPERM;
-	err = strict_strtoul(buf, 10, &tmp);
-	if (err || ((tmp != 0) && (tmp != 1)))
+	err = kstrtoul(buf, 10, &tmp);
+	if (err)
+		return err;
+	if ((tmp != 0) && (tmp != 1))
 		return -EINVAL;
 	frontswap_selfshrinking = !!tmp;
 	if (!was_enabled && !xen_selfballooning_enabled &&
@@ -437,8 +451,10 @@ static ssize_t store_frontswap_inertia(struct device *dev,
 
 	if (!capable(CAP_SYS_ADMIN))
 		return -EPERM;
-	err = strict_strtoul(buf, 10, &val);
-	if (err || val == 0)
+	err = kstrtoul(buf, 10, &val);
+	if (err)
+		return err;
+	if (val == 0)
 		return -EINVAL;
 	frontswap_inertia = val;
 	frontswap_inertia_counter = val;
@@ -460,8 +476,10 @@ static ssize_t store_frontswap_hysteresis(struct device *dev,
 
 	if (!capable(CAP_SYS_ADMIN))
 		return -EPERM;
-	err = strict_strtoul(buf, 10, &val);
-	if (err || val == 0)
+	err = kstrtoul(buf, 10, &val);
+	if (err)
+		return err;
+	if (val == 0)
 		return -EINVAL;
 	frontswap_hysteresis = val;
 	return count;