tree f6bccc81c1d4405873b5b936d1a7c12bc60a9f82
parent 18240904960a39e582ced8ba8ececb10b8c22dd3
author Jens Axboe <jens.axboe@oracle.com> 1253044391 +0200
committer Jens Axboe <jens.axboe@oracle.com> 1253044391 +0200

block: fix linkage problem with blk_iopoll and !CONFIG_BLOCK

 kernel/built-in.o:(.data+0x17b0): undefined reference to `blk_iopoll_enabled'

Since the extern declaration makes the compile work, but the actual
symbol is missing when block/blk-iopoll.o isn't linked in.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>