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Subject[RFC PATCH 17/24] mm/hugetlb: Add a BUILD_BUG_ON to check if struct page size is a power of two
Date
We only can free the unused vmemmap to the buddy system when the
size of struct page is a power of two. So add a BUILD_BUG_ON to
check the illegal case.

Signed-off-by: Muchun Song <songmuchun@bytedance.com>
---
mm/hugetlb.c | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 7072b849af3d..34706cec21ec 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -3817,6 +3817,10 @@ static int __init hugetlb_init(void)
{
int i;

+#ifdef CONFIG_HUGETLB_PAGE_FREE_VMEMMAP
+ BUILD_BUG_ON_NOT_POWER_OF_2(sizeof(struct page));
+#endif
+
if (!hugepages_supported()) {
if (hugetlb_max_hstate || default_hstate_max_huge_pages)
pr_warn("HugeTLB: huge pages not supported, ignoring associated command-line parameters\n");
--
2.20.1
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