Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933896Ab2KZRNf (ORCPT ); Mon, 26 Nov 2012 12:13:35 -0500 Received: from youngberry.canonical.com ([91.189.89.112]:48059 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933025Ab2KZRN2 (ORCPT ); Mon, 26 Nov 2012 12:13:28 -0500 From: Herton Ronaldo Krzesinski To: linux-kernel@vger.kernel.org, stable@vger.kernel.org, kernel-team@lists.ubuntu.com Cc: Dave Young , Dan Carpenter , Cong Wang , Flavio Leitner , Tejun Heo , ianfang.cn@gmail.com, Vivek Goyal , Linus Torvalds , Andrew Morton , Ingo Molnar , Herton Ronaldo Krzesinski Subject: [PATCH 217/270] Revert "x86/mm: Fix the size calculation of mapping tables" Date: Mon, 26 Nov 2012 14:58:27 -0200 Message-Id: <1353949160-26803-218-git-send-email-herton.krzesinski@canonical.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1353949160-26803-1-git-send-email-herton.krzesinski@canonical.com> References: <1353949160-26803-1-git-send-email-herton.krzesinski@canonical.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3582 Lines: 110 3.5.7u1 -stable review patch. If anyone has any objections, please let me know. ------------------ From: Dave Young commit 7b16bbf97375d9fb7fc107b3f80afeb94a204e44 upstream. Commit: 722bc6b16771 x86/mm: Fix the size calculation of mapping tables Tried to address the issue that the first 2/4M should use 4k pages if PSE enabled, but extra counts should only be valid for x86_32. This commit caused a kdump regression: the kdump kernel hangs. Work is in progress to fundamentally fix the various page table initialization issues that we have, via the design suggested by H. Peter Anvin, but it's not ready yet to be merged. So, to get a working kdump revert to the last known working version, which is the revert of this commit and of a followup fix (which was incomplete): bd2753b2dda7 x86/mm: Only add extra pages count for the first memory range during pre-allocation Tested kdump on physical and virtual machines. Signed-off-by: Dave Young Acked-by: Yinghai Lu Acked-by: Cong Wang Acked-by: Flavio Leitner Tested-by: Flavio Leitner Cc: Dan Carpenter Cc: Cong Wang Cc: Flavio Leitner Cc: Tejun Heo Cc: ianfang.cn@gmail.com Cc: Vivek Goyal Cc: Linus Torvalds Cc: Andrew Morton Signed-off-by: Ingo Molnar Signed-off-by: Herton Ronaldo Krzesinski --- arch/x86/mm/init.c | 22 +++++++++------------- 1 file changed, 9 insertions(+), 13 deletions(-) diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c index bc4e9d8..37b2e6a 100644 --- a/arch/x86/mm/init.c +++ b/arch/x86/mm/init.c @@ -29,14 +29,8 @@ int direct_gbpages #endif ; -struct map_range { - unsigned long start; - unsigned long end; - unsigned page_size_mask; -}; - -static void __init find_early_table_space(struct map_range *mr, unsigned long end, - int use_pse, int use_gbpages) +static void __init find_early_table_space(unsigned long end, int use_pse, + int use_gbpages) { unsigned long puds, pmds, ptes, tables, start = 0, good_end = end; phys_addr_t base; @@ -61,10 +55,6 @@ static void __init find_early_table_space(struct map_range *mr, unsigned long en #ifdef CONFIG_X86_32 extra += PMD_SIZE; #endif - /* The first 2/4M doesn't use large pages. */ - if (mr->start < PMD_SIZE) - extra += mr->end - mr->start; - ptes = (extra + PAGE_SIZE - 1) >> PAGE_SHIFT; } else ptes = (end + PAGE_SIZE - 1) >> PAGE_SHIFT; @@ -95,6 +85,12 @@ void __init native_pagetable_reserve(u64 start, u64 end) memblock_reserve(start, end - start); } +struct map_range { + unsigned long start; + unsigned long end; + unsigned page_size_mask; +}; + #ifdef CONFIG_X86_32 #define NR_RANGE_MR 3 #else /* CONFIG_X86_64 */ @@ -267,7 +263,7 @@ unsigned long __init_refok init_memory_mapping(unsigned long start, * nodes are discovered. */ if (!after_bootmem) - find_early_table_space(&mr[0], end, use_pse, use_gbpages); + find_early_table_space(end, use_pse, use_gbpages); for (i = 0; i < nr_range; i++) ret = kernel_physical_mapping_init(mr[i].start, mr[i].end, -- 1.7.9.5 -- 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/