x86: cpa selftest, skip non present entries

pud and pmd entries in the RAM area might be marked as non present.
Do not try to modify them in the selftest.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 2 insertions, 1 deletions

diff --git a/arch/x86/mm/pageattr-test.c b/arch/x86/mm/pageattr-test.c
index 7573e786d2f2..398f3a578dde 100644
--- a/arch/x86/mm/pageattr-test.c
+++ b/arch/x86/mm/pageattr-test.c
@@ -137,7 +137,8 @@ static __init int exercise_pageattr(void)
 
                 for (k = 0; k < len[i]; k++) {
                         pte = lookup_address(addr[i] + k*PAGE_SIZE, &level);
-                        if (!pte || pgprot_val(pte_pgprot(*pte)) == 0) {
+                        if (!pte || pgprot_val(pte_pgprot(*pte)) == 0 ||
+                            !(pte_val(*pte) & _PAGE_PRESENT)) {
                                 addr[i] = 0;
                                 break;
                         }