From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753977Ab0JNAcH (ORCPT ); Wed, 13 Oct 2010 20:32:07 -0400 Received: from hera.kernel.org ([140.211.167.34]:46204 "EHLO hera.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752063Ab0JNAcE (ORCPT ); Wed, 13 Oct 2010 20:32:04 -0400 Date: Thu, 14 Oct 2010 00:31:47 GMT From: tip-bot for Jeremy Fitzhardinge Cc: linux-kernel@vger.kernel.org, jeremy@goop.org, hpa@zytor.com, mingo@redhat.com, tglx@linutronix.de, hpa@linux.intel.com, jeremy.fitzhardinge@citrix.com Reply-To: mingo@redhat.com, hpa@zytor.com, jeremy@goop.org, linux-kernel@vger.kernel.org, tglx@linutronix.de, hpa@linux.intel.com, jeremy.fitzhardinge@citrix.com In-Reply-To: <4CB641F7.9040103@goop.org> References: <4CB641F7.9040103@goop.org> To: linux-tip-commits@vger.kernel.org Subject: [tip:core/memblock] x86-64: Only set max_pfn_mapped to 512 MiB if we enter via head_64.S Message-ID: Git-Commit-ID: 859ee4f57fb4e91de8439496f62eb996f4a28ca8 X-Mailer: tip-git-log-daemon MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Disposition: inline X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.2.3 (hera.kernel.org [127.0.0.1]); Thu, 14 Oct 2010 00:31:48 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Commit-ID: 859ee4f57fb4e91de8439496f62eb996f4a28ca8 Gitweb: http://git.kernel.org/tip/859ee4f57fb4e91de8439496f62eb996f4a28ca8 Author: Jeremy Fitzhardinge AuthorDate: Wed, 13 Oct 2010 16:34:15 -0700 Committer: H. Peter Anvin CommitDate: Wed, 13 Oct 2010 17:09:59 -0700 x86-64: Only set max_pfn_mapped to 512 MiB if we enter via head_64.S head_64.S maps up to 512 MiB, but that is not necessarity true for other entry paths, such as Xen. Thus, co-locate the setting of max_pfn_mapped with the code to actually set up the page tables in head_64.S. The 32-bit code is already so co-located. (The Xen code already sets max_pfn_mapped correctly for its own use case.) Signed-off-by: Jeremy Fitzhardinge LKML-Reference: <4CB641F7.9040103@goop.org> Signed-off-by: H. Peter Anvin --- arch/x86/kernel/head_64.S | 2 ++ arch/x86/kernel/setup.c | 1 - 2 files changed, 2 insertions(+), 1 deletions(-) diff --git a/arch/x86/kernel/head_64.S b/arch/x86/kernel/head_64.S index 239046b..b75c6f4 100644 --- a/arch/x86/kernel/head_64.S +++ b/arch/x86/kernel/head_64.S @@ -141,6 +141,8 @@ ident_complete: addq %rbp, trampoline_level4_pgt + (511*8)(%rip) #endif + movq $KERNEL_IMAGE_SIZE / PAGE_SIZE, max_pfn_mapped(%rip) + /* Due to ENTRY(), sometimes the empty space gets filled with * zeros. Better take a jmp than relying on empty space being * filled with 0x90 (nop) diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c index b11a238..c3cebfe 100644 --- a/arch/x86/kernel/setup.c +++ b/arch/x86/kernel/setup.c @@ -932,7 +932,6 @@ void __init setup_arch(char **cmdline_p) max_low_pfn = max_pfn; high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1; - max_pfn_mapped = KERNEL_IMAGE_SIZE >> PAGE_SHIFT; #endif /*