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sched: numa: Fix build error if CONFIG_NUMA_BALANCING && !CONFIG_TRANSPARENT_HUGEPAGE

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

  kernel/sched/fair.c: In function ‘task_numa_work’:
  kernel/sched/fair.c:932:55: error: call to ‘__build_bug_failed’ 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@suse.cz>
Signed-off-by: Mel Gorman <mgorman@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Mel Gorman 2012-12-17 14:05:53 +00:00 committed by Linus Torvalds
parent a4f1de1766
commit 221392c3ad
1 changed files with 1 additions and 1 deletions
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2
kernel/sched/fair.c
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@ -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 {