nvme: use kstrtobool() instead of strtobool()

strtobool() is the same as kstrtobool().
However, the latter is more used within the kernel.

In order to remove strtobool() and slightly simplify kstrtox.h, switch to
the other function name.

While at it, include the corresponding header file (<linux/kstrtox.h>)
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: Christoph Hellwig <hch@lst.de>

drivers/nvme/host/pci.c

@@ -15,6 +15,7 @@
 #include <linux/init.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>
+#include <linux/kstrtox.h>
 #include <linux/memremap.h>
 #include <linux/mm.h>
 #include <linux/module.h>
@@ -2184,7 +2185,7 @@ static ssize_t hmb_store(struct device *dev, struct device_attribute *attr,
 	bool new;
 	int ret;
 
-	if (strtobool(buf, &new) < 0)
+	if (kstrtobool(buf, &new) < 0)
 		return -EINVAL;
 
 	if (new == ndev->hmb)

drivers/nvme/target/configfs.c

@@ -4,6 +4,7 @@
  * Copyright (c) 2015-2016 HGST, a Western Digital Company.
  */
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#include <linux/kstrtox.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/slab.h>
@@ -267,7 +268,7 @@ static ssize_t nvmet_param_pi_enable_store(struct config_item *item,
 	struct nvmet_port *port = to_nvmet_port(item);
 	bool val;
 
-	if (strtobool(page, &val))
+	if (kstrtobool(page, &val))
 		return -EINVAL;
 
 	if (nvmet_is_port_enabled(port, __func__))
@@ -532,7 +533,7 @@ static ssize_t nvmet_ns_enable_store(struct config_item *item,
 	bool enable;
 	int ret = 0;
 
-	if (strtobool(page, &enable))
+	if (kstrtobool(page, &enable))
 		return -EINVAL;
 
 	if (enable)
@@ -556,7 +557,7 @@ static ssize_t nvmet_ns_buffered_io_store(struct config_item *item,
 	struct nvmet_ns *ns = to_nvmet_ns(item);
 	bool val;
 
-	if (strtobool(page, &val))
+	if (kstrtobool(page, &val))
 		return -EINVAL;
 
 	mutex_lock(&ns->subsys->lock);
@@ -579,7 +580,7 @@ static ssize_t nvmet_ns_revalidate_size_store(struct config_item *item,
 	struct nvmet_ns *ns = to_nvmet_ns(item);
 	bool val;
 
-	if (strtobool(page, &val))
+	if (kstrtobool(page, &val))
 		return -EINVAL;
 
 	if (!val)
@@ -728,7 +729,7 @@ static ssize_t nvmet_passthru_enable_store(struct config_item *item,
 	bool enable;
 	int ret = 0;
 
-	if (strtobool(page, &enable))
+	if (kstrtobool(page, &enable))
 		return -EINVAL;
 
 	if (enable)
@@ -995,7 +996,7 @@ static ssize_t nvmet_subsys_attr_allow_any_host_store(struct config_item *item,
 	bool allow_any_host;
 	int ret = 0;
 
-	if (strtobool(page, &allow_any_host))
+	if (kstrtobool(page, &allow_any_host))
 		return -EINVAL;
 
 	down_write(&nvmet_config_sem);
@@ -1382,7 +1383,7 @@ static ssize_t nvmet_subsys_attr_pi_enable_store(struct config_item *item,
 	struct nvmet_subsys *subsys = to_subsys(item);
 	bool pi_enable;
 
-	if (strtobool(page, &pi_enable))
+	if (kstrtobool(page, &pi_enable))
 		return -EINVAL;
 
 	subsys->pi_support = pi_enable;
@@ -1511,7 +1512,7 @@ static ssize_t nvmet_referral_enable_store(struct config_item *item,
 	struct nvmet_port *port = to_nvmet_port(item);
 	bool enable;
 
-	if (strtobool(page, &enable))
+	if (kstrtobool(page, &enable))
 		goto inval;
 
 	if (enable)