Johannes Berg writes:

The generic LED code now makes sure that suspended devices don't blink,
so we no longer need to do it ourselves. For the suspend to disk case,
however, we need to make sure that we don't blink if the PMU sysdev
was suspended before the LED device.

With this patch I get:

  LD      .tmp_vmlinux1
drivers/built-in.o:(.toc1+0x71d8): undefined reference to `pmu_sys_suspended'

with a 64-bit config that has CONFIG_PPC_PMAC=y and CONFIG_PM=n.

Paul.