s390/mm: always use PAGE_KERNEL when mapping pages

Always use PAGE_KERNEL when re-enabling pages within the kernel
mapping due to debug pagealloc. Without using this pgprot value
pte_mkwrite() and pte_wrprotect() won't work on such mappings after an
unmap -> map cycle anymore.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Acked-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

diff --git a/arch/s390/mm/pageattr.c b/arch/s390/mm/pageattr.c
index f2a5c29..e67a8f7 100644 (file)
--- a/arch/s390/mm/pageattr.c
+++ b/arch/s390/mm/pageattr.c
@@ -138,7 +138,7 @@ void __kernel_map_pages(struct page *page, int numpages, int enable)
                nr = min(numpages - i, nr);
                if (enable) {
                        for (j = 0; j < nr; j++) {
-                               pte_val(*pte) = __pa(address);
+                               pte_val(*pte) = address | pgprot_val(PAGE_KERNEL);
                                address += PAGE_SIZE;
                                pte++;
                        }