i'm currently writing a tutorial on sysfs and kobjects, and an early section will explain where all the top level kobjects under /sys come from. most of them are fairly obvious. first, a lot of them are global kobjects, as in: $ grep -r "struct kobject.*_kobj;" * arch/x86/platform/uv/uv_sysfs.c:struct kobject *sgi_uv_kobj; arch/x86/include/asm/uv/bios.h:extern struct kobject *sgi_uv_kobj; /* /sys/firmware/sgi_uv */ arch/s390/hypfs/inode.c:static struct kobject *s390_kobj; arch/powerpc/platforms/pseries/power.c:struct kobject *power_kobj; arch/powerpc/platforms/pseries/mobility.c:static struct kobject *mobility_kobj; drivers/parisc/pdc_stable.c:static struct kobject *stable_kobj; drivers/base/hypervisor.c:struct kobject *hypervisor_kobj; drivers/base/core.c:static struct kobject *dev_kobj; ... snip ... and the top-level objects have a common creation call: $ grep -r "kobject_create_and_add.*NULL" * arch/powerpc/platforms/pseries/power.c: power_kobj = kobject_create_and_add("power", NULL); block/genhd.c: block_depr = kobject_create_and_add("block", NULL); drivers/base/hypervisor.c: hypervisor_kobj = kobject_create_and_add("hypervisor", NULL); drivers/base/core.c: dev_kobj = kobject_create_and_add("dev", NULL); drivers/base/firmware.c: firmware_kobj = kobject_create_and_add("firmware", NULL); drivers/staging/speakup/kobjects.c: accessibility_kobj = kobject_create_and_add("accessibility", NULL); fs/namespace.c: fs_kobj = kobject_create_and_add("fs", NULL); kernel/ksysfs.c: kernel_kobj = kobject_create_and_add("kernel", NULL); kernel/power/main.c: power_kobj = kobject_create_and_add("power", NULL); $ but i don't see the call that creates the kobject for "/sys/bus", and i've poked around, checking other kobject creation variations. any hints? rday -- ======================================================================== Robert P. J. Day Ottawa, Ontario, CANADA http://crashcourse.ca Twitter: http://twitter.com/rpjday LinkedIn: http://ca.linkedin.com/in/rpjday ========================================================================