[PATCH] sched: numa: Fix build error if CONFIG_NUMA_BALANCING &&!CONFIG_TRANSPARENT_HUGEPAGE

[Mel Gorman]

Michal Hocko reported that the following build error occurs if
CONFIG_NUMA_BALANCING is set without THP support

kernel/sched/fair.c: In function â??task_numa_workâ??:
kernel/sched/fair.c:932:55: error: call to â??__build_bug_failedâ?? declared with attribute error: BUILD_BUG failed

The problem is that HPAGE_PMD_SHIFT triggers a BUILD_BUG() on
!CONFIG_TRANSPARENT_HUGEPAGE. This patch addresses the problem.

Reported-by: Michal Hocko <mhocko@xxxxxxx>
Signed-off-by: Mel Gorman <mgorman@xxxxxxx>
---
 kernel/sched/fair.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 9af5af9..4603d6c 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -929,7 +929,7 @@ void task_numa_work(struct callback_head *work)
 			continue;
 
 		/* Skip small VMAs. They are not likely to be of relevance */
-		if (((vma->vm_end - vma->vm_start) >> PAGE_SHIFT) < HPAGE_PMD_NR)
+		if (vma->vm_end - vma->vm_start < HPAGE_SIZE)
 			continue;
 
 		do {

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