randconfig testing found this (post-v2.6.24) build bug:

 drivers/built-in.o: In function `hifn_unregister_rng':
 hifn_795x.c:(.text+0x17bbd9): undefined reference to `hwrng_unregister'
 drivers/built-in.o: In function `hifn_probe':
 hifn_795x.c:(.text+0x17df70): undefined reference to `hwrng_register'

config attached.

i tried to reply to the pull request on lkml, but was unable to find 
one. The bug came in via:

    Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6

    * git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6: (125 commits)

	Ingo