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| author | Gerald Schaefer <gerald.schaefer@de.ibm.com> | 2012-05-09 16:27:37 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2012-05-16 14:42:39 +0200 |
| commit | a686425b31bb6441f6e20d698bf31dc65043f61f (patch) | |
| tree | f3bebaf302b88c2538bb8c45216f975886d36070 /arch/s390/mm | |
| parent | 5e8010cb50d3de7202641c0088c211f7c9593ebc (diff) | |
| download | linux-3.10-a686425b31bb6441f6e20d698bf31dc65043f61f.tar.gz linux-3.10-a686425b31bb6441f6e20d698bf31dc65043f61f.tar.bz2 linux-3.10-a686425b31bb6441f6e20d698bf31dc65043f61f.zip | |
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>
Diffstat (limited to 'arch/s390/mm')
| -rw-r--r-- | arch/s390/mm/hugetlbpage.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/s390/mm/hugetlbpage.c b/arch/s390/mm/hugetlbpage.c index 597bb2d27c3..900de2b3cf2 100644 --- 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; } |