From: Thomas Gleixner <tglx@linutronix.de>
Date: Mon, 4 Feb 2008 15:48:08 +0000 (+0100)
Subject: x86: cpa selftest, skip non present entries
X-Git-Tag: v2.6.25-rc1~1057^2~16
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=64f351d197d9ae8ad9624998afa8ee18e696ca44;p=linux-2.6

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 7573e786d2..398f3a578d 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;
 			}