[PATCH 30/75] Driver core: exclude kobject_uevent.c for !CONFIG_HOTPLUG

Greg Kroah-Hartman
2007-10-12T22:35:50Z

From: Kay Sievers <kay.sievers@vrfy.org>

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>
---
drivers/base/core.c | 18 +++-----------
include/linux/kobject.h | 10 +++++--
lib/Makefile | 3 +-
lib/kobject_uevent.c | 57 ++++++++++++++++++++++++++++++++++++----------
4 files changed, 57 insertions(+), 31 deletions(-)

diff --git a/drivers/base/core.c b/drivers/base/core.c
index d487c03..65de221 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -234,13 +234,11 @@ static ssize_t show_uevent(struct device *dev, struct device_attribute *attr,

/* search the kset, the device belongs to */
top_kobj = &dev->kobj;
- if (!top_kobj->kset && top_kobj->parent) {
- do {
- top_kobj = top_kobj->parent;
- } while (!top_kobj->kset && top_kobj->parent);
- }
+ while (!top_kobj->kset && top_kobj->parent)
+ top_kobj = top_kobj->parent;
if (!top_kobj->kset)
goto out;
+
kset = top_kobj->kset;
if (!kset->uevent_ops || !kset->uevent_ops->uevent)
goto out;
@@ -270,17 +268,9 @@ out:
static ssize_t store_uevent(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
- size_t len = count;
enum kobject_action action;

- if (len && buf[len-1] == '\n')
- len--;
-
- for (action = 0; action < KOBJ_MAX; action++) {
- if (strncmp(kobject_actions[action], buf, len) != 0)
- continue;
- if (kobject_actions[action][len] != '\0')
- continue;
+ if (kobject_action_type(buf, count, &action) == 0) {
kobject_uevent(&dev->kobj, action);
goto out;
}
diff --git a/include/linux/kobject.h b/include/linux/kobject.h
index 56f5eaf..0777b3f 100644
--- a/include/linux/kobject.h
+++ b/include/linux/kobject.h
@@ -58,9 +58,6 @@ enum kobject_action {
KOBJ_MAX
};

-/* The list of strings defining the valid kobject actions as specified above */
-extern const char *kobject_actions[];
-
struct kobject {
const char * k_name;
struct kref kref;
@@ -241,6 +238,9 @@ int kobject_uevent_env(struct kobject *kobj, enum kobject_action action,

int add_uevent_var(struct kobj_uevent_env *env, const char *format, ...)
__attribute__((format (printf, 2, 3)));
+
+int kobject_action_type(const char *buf, size_t count,
+ enum kobject_action *type);
#else
static inline int kobject_uevent(struct kobject *kobj, enum kobject_action action)
{ return 0; }
@@ -251,6 +251,10 @@ static inline int kobject_uevent_env(struct kobject *kobj,

static inline int add_uevent_var(struct kobj_uevent_env *env, const char *format, ...)
{ return 0; }
+
+static inline int kobject_action_type(const char *buf, size_t count,
+ enum kobject_action *type)
+{ return -EINVAL; }
#endif

#endif /* __KERNEL__ */
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 */
--
1.5.3.4