[PATCH-RT] preempt.h: Fix implicit declaration of 'preempt_check_resched_rt'

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When building a non-preempt kernel where CONFIG_PREEMPT_COUNT is not
defined the following build break occurs.

/home/jkacur/linux-rt/block/blk-softirq.c: In function ‘trigger_softirq’:
/home/jkacur/linux-rt/block/blk-softirq.c:54: error: implicit declaration of function ‘preempt_check_resched_rt’
make[2]: *** [block/blk-softirq.o] Error 1
make[1]: *** [block/blk-softirq.o] Error 2
make: *** [sub-make] Error 2

This patch fixes the build error by adding a define to the

Signed-off-by: Clark Williams <williams@xxxxxxxxxx>
Signed-off-by: John Kacur <jkacur@xxxxxxxxxx>
 include/linux/preempt.h |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/include/linux/preempt.h b/include/linux/preempt.h
index fa40695..58d8982 100644
--- a/include/linux/preempt.h
+++ b/include/linux/preempt.h
@@ -107,6 +107,7 @@ do { \
 #define preempt_disable_notrace()		do { } while (0)
 #define preempt_enable_no_resched_notrace()	do { } while (0)
 #define preempt_enable_notrace()		do { } while (0)
+#define preempt_check_resched_rt()	do { } while (0)

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