3.16-stable review patch. If anyone has any objections, please let me know.
------------------ From: Christian Borntraeger <[email protected]> commit 1951497d90d6754201af3e65241a06f9ef6755cd upstream. commit 0944fe3f4a32 ("s390/mm: implement software referenced bits") triggered another paging/storage key corruption. There is an unhandled invalid->valid pte change where we have to set the real storage key from the pgste. When doing paging a guest page might be swapcache or swap and when faulted in it might be read-only and due to a parallel scan old. An do_wp_page will make it writeable and young. Due to software reference tracking this page was invalid and now becomes valid. Signed-off-by: Christian Borntraeger <[email protected]> Acked-by: Martin Schwidefsky <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- arch/s390/include/asm/pgtable.h | 1 + 1 file changed, 1 insertion(+) --- a/arch/s390/include/asm/pgtable.h +++ b/arch/s390/include/asm/pgtable.h @@ -1319,6 +1319,7 @@ static inline int ptep_set_access_flags( ptep_flush_direct(vma->vm_mm, address, ptep); if (mm_has_pgste(vma->vm_mm)) { + pgste_set_key(ptep, pgste, entry, vma->vm_mm); pgste = pgste_set_pte(ptep, pgste, entry); pgste_set_unlock(ptep, pgste); } else -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
