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Date: Mon, 17 Dec 2012 14:05:53 +0000 From: Mel Gorman <mgorman@...e.de> To: Linus Torvalds <torvalds@...ux-foundation.org> Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>, Andrea Arcangeli <aarcange@...hat.com>, Ingo Molnar <mingo@...nel.org>, Rik van Riel <riel@...hat.com>, Johannes Weiner <hannes@...xchg.org>, Hugh Dickins <hughd@...gle.com>, Thomas Gleixner <tglx@...utronix.de>, Paul Turner <pjt@...gle.com>, Hillf Danton <dhillf@...il.com>, David Rientjes <rientjes@...gle.com>, Lee Schermerhorn <Lee.Schermerhorn@...com>, Alex Shi <lkml.alex@...il.com>, Srikar Dronamraju <srikar@...ux.vnet.ibm.com>, Aneesh Kumar <aneesh.kumar@...ux.vnet.ibm.com>, Andrew Morton <akpm@...ux-foundation.org>, Michal Hocko <mhocko@...e.cz>, LKML <linux-kernel@...r.kernel.org> Subject: [PATCH] sched: numa: Fix build error if CONFIG_NUMA_BALANCING && !CONFIG_TRANSPARENT_HUGEPAGE Michal Hocko reported that the following build error occurs if CONFIG_NUMA_BALANCING is set without THP support kernel/sched/fair.c: In function âtask_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@...e.cz> Signed-off-by: Mel Gorman <mgorman@...e.de> --- 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 { -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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