Original Makefile:
------------------

#
# OTG infrastructure and transceiver drivers
#

# infrastructure
obj-$(CONFIG_USB_OTG_UTILS) += otg.o

# transceiver drivers
obj-$(CONFIG_USB_GPIO_VBUS) += gpio_vbus.o
obj-$(CONFIG_ISP1301_OMAP)  += isp1301_omap.o
obj-$(CONFIG_TWL4030_USB)   += twl4030-usb.o
obj-$(CONFIG_NOP_USB_XCEIV) += nop-usb-xceiv.o
obj-$(CONFIG_USB_ULPI)      += ulpi.o
obj-$(CONFIG_USB_MSM_OTG_72K)   += msm72k_otg.o

ccflags-$(CONFIG_USB_DEBUG) += -DDEBUG
ccflags-$(CONFIG_USB_GADGET_DEBUG) += -DDEBUG


Original error:
---------------

  LD      init/built-in.o
  LD      .tmp_vmlinux1
drivers/built-in.o: In function `msm_otg_set_host':
/home/csaba/kernel_blade/zte-kernel-msm7x27/drivers/usb/otg/msm72k_otg.c:1049: undefined reference to `usb_unregister_notify'
/home/csaba/kernel_blade/zte-kernel-msm7x27/drivers/usb/otg/msm72k_otg.c:1061: undefined reference to `usb_register_notify'
make: *** [.tmp_vmlinux1] Error 1


Makefile after adding linker parameter:
---------------------------------------

#
# OTG infrastructure and transceiver drivers
#

# infrastructure
obj-$(CONFIG_USB_OTG_UTILS) += otg.o

# transceiver drivers
obj-$(CONFIG_USB_GPIO_VBUS) += gpio_vbus.o
obj-$(CONFIG_ISP1301_OMAP)  += isp1301_omap.o
obj-$(CONFIG_TWL4030_USB)   += twl4030-usb.o
obj-$(CONFIG_NOP_USB_XCEIV) += nop-usb-xceiv.o
obj-$(CONFIG_USB_ULPI)      += ulpi.o
obj-$(CONFIG_USB_MSM_OTG_72K)   += msm72k_otg.o
ldflags-$(CONFIG_USB_MSM_OTG_72K) += drivers/usb/core/notify.o

ccflags-$(CONFIG_USB_DEBUG) += -DDEBUG
ccflags-$(CONFIG_USB_GADGET_DEBUG) += -DDEBUG


Error after modification:
-------------------------

  LD      init/built-in.o
  LD      .tmp_vmlinux1
drivers/built-in.o: In function `usb_notify_remove_device':
/home/csaba/kernel_blade/zte-kernel-msm7x27/drivers/usb/core/notify.c:57: undefined reference to `usbfs_mutex'
make: *** [.tmp_vmlinux1] Error 1