Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932521Ab2JRU5A (ORCPT ); Thu, 18 Oct 2012 16:57:00 -0400 Received: from acsinet15.oracle.com ([141.146.126.227]:24696 "EHLO acsinet15.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756100Ab2JRUvH (ORCPT ); Thu, 18 Oct 2012 16:51:07 -0400 From: Yinghai Lu To: Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" , Jacob Shin , Tejun Heo Cc: Stefano Stabellini , linux-kernel@vger.kernel.org, Yinghai Lu Subject: [PATCH 19/19] x86, mm: Add check before clear pte above max_low_pfn on 32bit Date: Thu, 18 Oct 2012 13:50:30 -0700 Message-Id: <1350593430-24470-23-git-send-email-yinghai@kernel.org> X-Mailer: git-send-email 1.7.7 In-Reply-To: <1350593430-24470-1-git-send-email-yinghai@kernel.org> References: <1350593430-24470-1-git-send-email-yinghai@kernel.org> X-Source-IP: ucsinet21.oracle.com [156.151.31.93] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2646 Lines: 70 During test patch that adjust page_size_mask to map small range ram with big page size, found page table is setup wrongly for 32bit. And native_pagetable_init wrong clear pte for pmd with large page support. 1. add more comments about why we are expecting pte. 2. Add BUG checking, so next time we could find problem earlier when we mess up page table setup again. 3. max_low_pfn is not included boundary for low memory mapping. We should check from max_low_pfn instead of +1. 4. add print out when some pte really get cleared, or we should use WARN() to find out why above max_low_pfn get mapped? so we could fix it. Signed-off-by: Yinghai Lu --- arch/x86/mm/init_32.c | 18 ++++++++++++++++-- 1 files changed, 16 insertions(+), 2 deletions(-) diff --git a/arch/x86/mm/init_32.c b/arch/x86/mm/init_32.c index 0f05742..49e9edf 100644 --- a/arch/x86/mm/init_32.c +++ b/arch/x86/mm/init_32.c @@ -480,9 +480,14 @@ void __init native_pagetable_init(void) /* * Remove any mappings which extend past the end of physical - * memory from the boot time page table: + * memory from the boot time page table. + * In virtual address space, we should have at least two pages + * from VMALLOC_END to pkmap or fixmap according to VMALLOC_END + * definition. And max_low_pfn is set to VMALLOC_END physical + * address. If initial memory mapping is doing right job, we + * should have pte used near max_low_pfn or one pmd is not present. */ - for (pfn = max_low_pfn + 1; pfn < 1<<(32-PAGE_SHIFT); pfn++) { + for (pfn = max_low_pfn; pfn < 1<<(32-PAGE_SHIFT); pfn++) { va = PAGE_OFFSET + (pfn<> PAGE_SHIFT); -- 1.7.7 -- 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/