Fix compile error in blk-exec.c for !CONFIG_DETECT_HUNG_TASK

Ensure that 'sysctl_hung_task_timeout_secs' is defined
even when CONFIG_DETECT_HUNG_TASK is not set.
This way we can safely reference it without need for
ifdefs in the code elsewhere.  eg. in block/blk-exec.c

Signed-off-by: Mark Lord <mlord@pobox.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/include/linux/sched.h b/include/linux/sched.h
index 1e2a6db2d7dd..dbafa9e34a2d 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -336,6 +336,9 @@ extern unsigned long sysctl_hung_task_warnings;
 extern int proc_dohung_task_timeout_secs(struct ctl_table *table, int write,
                                          void __user *buffer,
                                          size_t *lenp, loff_t *ppos);
+#else
+/* Avoid need for ifdefs elsewhere in the code */
+enum { sysctl_hung_task_timeout_secs = 0 };
 #endif
 
 /* Attach to any functions which should be ignored in wchan output. */