From cb684b5bcd6a79ae7e2360c6b158c4aa7b0a293a Mon Sep 17 00:00:00 2001
From: Jens Axboe <jens.axboe@oracle.com>
Date: Tue, 15 Sep 2009 21:53:11 +0200
Subject: [PATCH] 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>
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