From: Thomas Gleixner <tglx@linutronix.de>
Date: Mon, 4 Feb 2008 15:48:08 +0000 (+0100)
Subject: x86: fix page-present check in cpa_flush_range
X-Git-Tag: v2.6.25-rc1~1057^2~12
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7bfb72e847c201fe32271fb13f75d060671d8890;p=linux-2.6

x86: fix page-present check in cpa_flush_range

pte_present() might return true for PROT_NONE mappings.
Explicitely check the present bit.

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

diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c
index 0b029c9717..9be684e61d 100644
--- a/arch/x86/mm/pageattr.c
+++ b/arch/x86/mm/pageattr.c
@@ -119,7 +119,7 @@ static void cpa_flush_range(unsigned long start, int numpages, int cache)
 		/*
 		 * Only flush present addresses:
 		 */
-		if (pte && pte_present(*pte))
+		if (pte && (pte_val(*pte) & _PAGE_PRESENT))
 			clflush_cache_range((void *) addr, PAGE_SIZE);
 	}
 }