Driver core: exclude kobject_uevent.c for !CONFIG_HOTPLUG

Move uevent specific logic from the core into kobject_uevent.c, which
does no longer require to link the unused string array if hotplug
is not compiled in.

Signed-off-by: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

2 files changed, 46 insertions, 14 deletions

diff --git a/lib/Makefile b/lib/Makefile
index 4f3f3e2..6c4ea33 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -10,7 +10,7 @@ lib-y := ctype.o string.o vsprintf.o cmdline.o \
 lib-$(CONFIG_MMU) += ioremap.o
 lib-$(CONFIG_SMP) += cpumask.o
 
-lib-y	+= kobject.o kref.o kobject_uevent.o klist.o
+lib-y	+= kobject.o kref.o klist.o
 
 obj-y += div64.o sort.o parser.o halfmd4.o debug_locks.o random32.o \
 	 bust_spinlocks.o hexdump.o kasprintf.o
@@ -20,6 +20,7 @@ CFLAGS_kobject.o += -DDEBUG
 CFLAGS_kobject_uevent.o += -DDEBUG
 endif
 
+lib-$(CONFIG_HOTPLUG) += kobject_uevent.o
 obj-$(CONFIG_GENERIC_IOMAP) += iomap.o
 obj-$(CONFIG_HAS_IOMEM) += iomap_copy.o devres.o
 obj-$(CONFIG_CHECK_SIGNATURE) += check_signature.o
diff --git a/lib/kobject_uevent.c b/lib/kobject_uevent.c
index 5ccda46..a8efb48 100644
--- a/lib/kobject_uevent.c
+++ b/lib/kobject_uevent.c
@@ -23,17 +23,6 @@
 #include <net/sock.h>
 
 
-/* the strings here must match the enum in include/linux/kobject.h */
-const char *kobject_actions[] = {
-	"add",
-	"remove",
-	"change",
-	"move",
-	"online",
-	"offline",
-};
-
-#if defined(CONFIG_HOTPLUG)
 u64 uevent_seqnum;
 char uevent_helper[UEVENT_HELPER_PATH_LEN] = CONFIG_UEVENT_HELPER_PATH;
 static DEFINE_SPINLOCK(sequence_lock);
@@ -41,6 +30,50 @@ static DEFINE_SPINLOCK(sequence_lock);
 static struct sock *uevent_sock;
 #endif
 
+/* the strings here must match the enum in include/linux/kobject.h */
+static const char *kobject_actions[] = {
+	[KOBJ_ADD] =		"add",
+	[KOBJ_REMOVE] =		"remove",
+	[KOBJ_CHANGE] =		"change",
+	[KOBJ_MOVE] =		"move",
+	[KOBJ_ONLINE] =		"online",
+	[KOBJ_OFFLINE] =	"offline",
+};
+
+/**
+ * kobject_action_type - translate action string to numeric type
+ *
+ * @buf: buffer containing the action string, newline is ignored
+ * @len: length of buffer
+ * @type: pointer to the location to store the action type
+ *
+ * Returns 0 if the action string was recognized.
+ */
+int kobject_action_type(const char *buf, size_t count,
+			enum kobject_action *type)
+{
+	enum kobject_action action;
+	int ret = -EINVAL;
+
+	if (count && buf[count-1] == '\n')
+		count--;
+
+	if (!count)
+		goto out;
+
+	for (action = 0; action < ARRAY_SIZE(kobject_actions); action++) {
+		if (strncmp(kobject_actions[action], buf, count) != 0)
+			continue;
+		if (kobject_actions[action][count] != '\0')
+			continue;
+		*type = action;
+		ret = 0;
+		break;
+	}
+out:
+	return ret;
+}
+
 /**
  * kobject_uevent_env - send an uevent with environmental data
  *
@@ -270,5 +303,3 @@ static int __init kobject_uevent_init(void)
 
 postcore_initcall(kobject_uevent_init);
 #endif
-
-#endif /* CONFIG_HOTPLUG */