Hi,
The following set of .config settings:

#CONFIG_PM set to OFF
CONFIG_USB_ARCH_HAS_EHCI=y

triggers the following compile error:
...
  CC      init/version.o
  LD      init/built-in.o
  LD      .tmp_vmlinux1
arch/arm/mach-omap2/built-in.o: In function `omap3_sr_init':
usb-ehci.c:(.init.text+0xc0c): undefined reference to `power_kobj'
make: *** [.tmp_vmlinux1] Error 1

When EHCI is turned off, the error becomes:

arch/arm/mach-omap2/built-in.o: In function `omap3_sr_init':
board-omap3evm-flash.c:(.init.text+0xc0c): undefined reference to `power_kobj'
make: *** [.tmp_vmlinux1] Error 1

Error disappears when  Smart reflex is turned off:
#OMAP_SMARTREFLEX set to OFF

Than the kernel compiles OK.

-dmt
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