On 12/24/2015 12:51 PM, Kirill A. Shutemov wrote:
THP is properly handled in munlock_vma_pages_range(). It fixes crashes like this: http://lkml.kernel.org/r/565C5C38.3040705@xxxxxxxxxx Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Ack.
--- mm/mlock.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/mm/mlock.c b/mm/mlock.c index af421d8bd6da..9197b6721a1e 100644 --- a/mm/mlock.c +++ b/mm/mlock.c @@ -393,6 +393,13 @@ static unsigned long __munlock_pagevec_fill(struct pagevec *pvec, if (!page || page_zone_id(page) != zoneid) break; + /* + * Do not use pagevec for PTE-mapped THP, + * munlock_vma_pages_range() will handle them. + */ + if (PageTransCompound(page)) + break; + get_page(page); /* * Increase the address that will be returned *before* the
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