It is possible for some platforms, such as powerpc to set HPAGE_SHIFT to 0 to indicate huge pages not supported. When this is the case, hugetlbfs could be disabled during boot time: hugetlbfs: disabling because there are no supported hugepage sizes Then in dissolve_free_huge_pages(), order is kept maximum (64 for 64bits), and the for loop below won't end: for (pfn = start_pfn; pfn < end_pfn; pfn += 1 << order) The fix below returns directly if the order isn't set to a correct value. Signed-off-by: Li Zhong <zhong@xxxxxxxxxxxxxxxxxx> --- mm/hugetlb.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/mm/hugetlb.c b/mm/hugetlb.c index 2024bbd..a950817 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -1093,6 +1093,10 @@ void dissolve_free_huge_pages(unsigned long start_pfn, unsigned long end_pfn) for_each_hstate(h) if (order > huge_page_order(h)) order = huge_page_order(h); + + if (order == 8 * sizeof(void *)) + return; + VM_BUG_ON(!IS_ALIGNED(start_pfn, 1 << order)); for (pfn = start_pfn; pfn < end_pfn; pfn += 1 << order) dissolve_free_huge_page(pfn_to_page(pfn)); -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>