s390/hugepages: clear page table for sw large page emulation

The software large page emulation on s390 did not clear the the
pre-allocated page table in arch_release_hugepage() before freeing
it. This could trigger the WARN_ON(!pte_none(*pte) in mm/vmalloc.c:106
and make vmap_pte_range() fail, because the page table could be reused
in page_table_alloc(). This is fixed now by calling clear_table()
before page_table_free().

Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

diff --git a/arch/s390/mm/hugetlbpage.c b/arch/s390/mm/hugetlbpage.c
index 597bb2d27c3c0dbad5e5115396c5df483144d9d3..900de2b3cf28fb640417d1f4f94289b4ece2f08d 100644 (file)
--- a/arch/s390/mm/hugetlbpage.c
+++ b/arch/s390/mm/hugetlbpage.c
@@ -58,6 +58,8 @@ void arch_release_hugepage(struct page *page)
        ptep = (pte_t *) page[1].index;
        if (!ptep)
                return;
+       clear_table((unsigned long *) ptep, _PAGE_TYPE_EMPTY,
+                   PTRS_PER_PTE * sizeof(pte_t));
        page_table_free(&init_mm, (unsigned long *) ptep);
        page[1].index = 0;
 }