From 3085354de635179d70c240e6d942bcbd1d93056c Mon Sep 17 00:00:00 2001 From: Ingo Molnar Date: Thu, 27 Mar 2008 21:29:09 +0100 Subject: [PATCH] x86: prefetch fix #2 Linus noticed a second bug and an uncleanliness: - we'd return on any instruction fetch fault - we'd use both the value of 16 and the PF_INSTR symbol which are the same and make no sense the cleanup nicely unifies this piece of logic. Signed-off-by: Ingo Molnar --- arch/x86/mm/fault.c | 11 ++++------- 1 file changed, 4 insertions(+), 7 deletions(-) diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c index c0c82bc143c..ec08d838985 100644 --- a/arch/x86/mm/fault.c +++ b/arch/x86/mm/fault.c @@ -91,13 +91,10 @@ static int is_prefetch(struct pt_regs *regs, unsigned long addr, int prefetch = 0; unsigned char *max_instr; -#ifdef CONFIG_X86_32 - /* Catch an obscure case of prefetch inside an NX page: */ - if ((__supported_pte_mask & _PAGE_NX) && (error_code & 16)) - return 0; -#endif - - /* If it was a exec fault on NX page, ignore */ + /* + * If it was a exec (instruction fetch) fault on NX page, then + * do not ignore the fault: + */ if (error_code & PF_INSTR) return 0; -- 2.11.4.GIT