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>

diff --git a/arch/x86/mm/pageattr-test.c b/arch/x86/mm/pageattr-test.c
index 7573e78..398f3a5 100644 (file)
--- 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;
                        }