Rearrange struct device for better packing
PATCH 1/1 Rearrange struct device for better packing
This minor rearrangement saves 16 bytes from sizeof(struct device) according to pahole.
Signed-off-by Matthew Wilcox <[email protected]>
include/linux/device.h +3 -2
@@ -358,9 +358,9 @@ struct device {struct kobject kobj;char bus_id[BUS_ID_SIZE ];/* position on parent bus */ + unsigned uevent_suppress:1;const char *init_name;/* initial name of the device */ struct device_type *type; - unsigned uevent_suppress:1;struct semaphore sem;/* semaphore to synchronize calls to * its driver.
@@ -393,12 +393,13 @@ struct device {/* arch specific additions */ struct dev_archdata archdata; +dev_t devt;/* dev_t, creates the sysfs "dev" */ +spinlock_t devres_lock;struct list_head devres_head;struct list_head node;struct class *class; -dev_t devt;/* dev_t, creates the sysfs "dev" */ struct attribute_group **groups;/* optional groups */ void (*release)(struct device *dev);
Signature · 4 lines
Matthew Wilcox Intel Open Source Technology Centre "Bill, look, we understand that you're interested in selling us this operating system, but compare it to ours. We can't possibly take such a retrograde step."