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Commit 7bfb72e8 authored by Thomas Gleixner's avatar Thomas Gleixner Committed by Ingo Molnar
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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: default avatarThomas Gleixner <tglx@linutronix.de>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 6ce9fc17

arch/x86/mm/pageattr.c

+1 −1
Original line number Original line Diff line number Diff line
@@ -119,7 +119,7 @@ static void cpa_flush_range(unsigned long start, int numpages, int cache) 
		/*

		/*

		 * Only flush present addresses:

		 * Only flush present addresses:

		 */

		 */

		if (pte && pte_present(*pte))

		if (pte && (pte_val(*pte) & _PAGE_PRESENT))

			clflush_cache_range((void *) addr, PAGE_SIZE);

			clflush_cache_range((void *) addr, PAGE_SIZE);

	}

	}

}

}