From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754599Ab2LRHVh (ORCPT ); Tue, 18 Dec 2012 02:21:37 -0500 Received: from userp1040.oracle.com ([156.151.31.81]:38985 "EHLO userp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754131Ab2LRHQ0 (ORCPT ); Tue, 18 Dec 2012 02:16:26 -0500 From: Yinghai Lu To: Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" Cc: "Eric W. Biederman" , Andrew Morton , linux-kernel@vger.kernel.org, Yinghai Lu Subject: [PATCH v7 01/27] x86, mm: Fix page table early allocation offset checking Date: Mon, 17 Dec 2012 23:15:33 -0800 Message-Id: <1355814959-10573-2-git-send-email-yinghai@kernel.org> X-Mailer: git-send-email 1.7.10.4 In-Reply-To: <1355814959-10573-1-git-send-email-yinghai@kernel.org> References: <1355814959-10573-1-git-send-email-yinghai@kernel.org> X-Source-IP: acsinet21.oracle.com [141.146.126.237] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org During debug load kernel above 4G, found one page if is not used in BRK and it should be with early page allocation. Fix that checking and also add print out for every allocation from BRK Signed-off-by: Yinghai Lu --- arch/x86/mm/init.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c index 6f85de8..c4293cf 100644 --- a/arch/x86/mm/init.c +++ b/arch/x86/mm/init.c @@ -47,7 +47,7 @@ __ref void *alloc_low_pages(unsigned int num) __GFP_ZERO, order); } - if ((pgt_buf_end + num) >= pgt_buf_top) { + if ((pgt_buf_end + num) > pgt_buf_top) { unsigned long ret; if (min_pfn_mapped >= max_pfn_mapped) panic("alloc_low_page: ran out of memory"); @@ -61,6 +61,8 @@ __ref void *alloc_low_pages(unsigned int num) } else { pfn = pgt_buf_end; pgt_buf_end += num; + printk(KERN_DEBUG "BRK [%#010lx, %#010lx] PGTABLE\n", + pfn << PAGE_SHIFT, (pgt_buf_end << PAGE_SHIFT) - 1); } for (i = 0; i < num; i++) { -- 1.7.10.4