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>

1 files changed, 1 insertions, 1 deletions

diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c
index 0b029c97174e..9be684e61dcb 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);
         }
 }