linux-kernel - [PATCH] blkio: Fix linux-next build failure after merge of block tree

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Message-ID: <20100415053543.15190.98919.stgit@austin.mtv.corp.google.com>
Date:	Wed, 14 Apr 2010 22:36:00 -0700
From:	Divyesh Shah <dpshah@...gle.com>
To:	jens.axboe@...cle.com, sfr@...b.auug.org.au
Cc:	guijianfeng@...fujitsu.com, vgoyal@...hat.com,
	linux-next@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] blkio: Fix linux-next build failure after merge of block tree

After merging the block tree, 20100414's linux-next build (x86_64
allmodconfig) failed like this:

ERROR: "get_gendisk" [block/blk-cgroup.ko] undefined!
ERROR: "sched_clock" [block/blk-cgroup.ko] undefined!

This happens because the two symbols aren't exported and hence not available
when blk-cgroup code is built as a module. I've tried to stay consistent with
the use of EXPORT_SYMBOL or EXPORT_SYMBOL_GPL with the other symbols in the
respective files.

Signed-off-by: Divyesh Shah <dpshah@...gle.com>
---

 block/genhd.c        |    1 +
 kernel/sched_clock.c |    1 +
 2 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/block/genhd.c b/block/genhd.c
index d13ba76..154b5f8 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -596,6 +596,7 @@ struct gendisk *get_gendisk(dev_t devt, int *partno)
 
 	return disk;
 }
+EXPORT_SYMBOL(get_gendisk);
 
 /**
  * bdget_disk - do bdget() by gendisk and partition number
diff --git a/kernel/sched_clock.c b/kernel/sched_clock.c
index 5b49613..906a0f7 100644
--- a/kernel/sched_clock.c
+++ b/kernel/sched_clock.c
@@ -41,6 +41,7 @@ unsigned long long __attribute__((weak)) sched_clock(void)
 	return (unsigned long long)(jiffies - INITIAL_JIFFIES)
 					* (NSEC_PER_SEC / HZ);
 }
+EXPORT_SYMBOL_GPL(sched_clock);
 
 static __read_mostly int sched_clock_running;
 

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