Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751345AbaKFFmC (ORCPT ); Thu, 6 Nov 2014 00:42:02 -0500 Received: from mail-pa0-f51.google.com ([209.85.220.51]:43943 "EHLO mail-pa0-f51.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750782AbaKFFmB (ORCPT ); Thu, 6 Nov 2014 00:42:01 -0500 From: Minfei Huang To: tglx@linutronix.de, mingo@redhat.com Cc: x86@kernel.org, linux-kernel@vger.kernel.org, Minfei Huang Subject: [PATCH] x86/mm: Give the correct initail value to the pmd_idx Date: Thu, 6 Nov 2014 13:41:53 +0800 Message-Id: <1415252513-6453-1-git-send-email-mnfhuang@gmail.com> X-Mailer: git-send-email 1.8.3.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The variable value is undefined from the stack eara. So it makes sense to init the variable to run process correctly. If the variable pmd_idx inits the value more than PTRS_PER_PMD, the count may be smaller than the correct value, and the allocated page may be not enough for pte entry. The kernel may panic cause by the undefine variable which is allocated from stack. Signed-off-by: Minfei Huang --- arch/x86/mm/init_32.c | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/x86/mm/init_32.c b/arch/x86/mm/init_32.c index c8140e1..c23ab1e 100644 --- a/arch/x86/mm/init_32.c +++ b/arch/x86/mm/init_32.c @@ -137,6 +137,7 @@ page_table_range_init_count(unsigned long start, unsigned long end) vaddr = start; pgd_idx = pgd_index(vaddr); + pmd_idx = pmd_index(vaddr); for ( ; (pgd_idx < PTRS_PER_PGD) && (vaddr != end); pgd_idx++) { for (; (pmd_idx < PTRS_PER_PMD) && (vaddr != end); -- 1.8.3.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/