Messages in this thread Patch in this message | | | Subject | [PATCH 1/2] mm: hugetlbfs: Add some VM_BUG_ON()s to catch non-hugetlbfs pages | From | Dave Hansen <> | Date | Thu, 14 Nov 2013 15:33:58 -0800 |
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From: Dave Hansen <dave.hansen@linux.intel.com>
Dave Jiang reported that he was seeing oopses when running NUMA systems and default_hugepagesz=1G. I traced the issue down to migrate_page_copy() trying to use the same code for hugetlb pages and transparent hugepages. It should not have been trying to pass thp pages in there.
So, add some VM_BUG_ON()s for the next hapless VM developer that tries the same thing.
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> Reviewed-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
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linux.git-davehans/include/linux/hugetlb.h | 1 + linux.git-davehans/mm/hugetlb.c | 1 + 2 files changed, 2 insertions(+)
diff -puN include/linux/hugetlb.h~bug-not-hugetlbfs-in-copy_huge_page include/linux/hugetlb.h --- linux.git/include/linux/hugetlb.h~bug-not-hugetlbfs-in-copy_huge_page 2013-11-14 15:09:38.707180957 -0800 +++ linux.git-davehans/include/linux/hugetlb.h 2013-11-14 15:09:38.710181090 -0800 @@ -355,6 +355,7 @@ static inline pte_t arch_make_huge_pte(p static inline struct hstate *page_hstate(struct page *page) { + VM_BUG_ON(!PageHuge(page)); return size_to_hstate(PAGE_SIZE << compound_order(page)); } diff -puN mm/hugetlb.c~bug-not-hugetlbfs-in-copy_huge_page mm/hugetlb.c --- linux.git/mm/hugetlb.c~bug-not-hugetlbfs-in-copy_huge_page 2013-11-14 15:09:38.708181001 -0800 +++ linux.git-davehans/mm/hugetlb.c 2013-11-14 15:09:38.711181135 -0800 @@ -498,6 +498,7 @@ void copy_huge_page(struct page *dst, st int i; struct hstate *h = page_hstate(src); + VM_BUG_ON(!h); if (unlikely(pages_per_huge_page(h) > MAX_ORDER_NR_PAGES)) { copy_gigantic_page(dst, src); return; _
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