Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Sun, 25 Mar 2001 10:55:49 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Sun, 25 Mar 2001 10:55:40 -0500 Received: from chiara.elte.hu ([157.181.150.200]:35846 "HELO chiara.elte.hu") by vger.kernel.org with SMTP id ; Sun, 25 Mar 2001 10:55:25 -0500 Date: Sun, 25 Mar 2001 16:53:37 +0200 (CEST) From: Ingo Molnar Reply-To: To: Linus Torvalds Cc: Alan Cox , , Linux Kernel List Subject: [patch] pae-2.4.3-A4 In-Reply-To: Message-ID: MIME-Version: 1.0 Content-Type: MULTIPART/MIXED; BOUNDARY="655616-1918233271-985532017=:6469" Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org This message is in MIME format. The first part should be readable text, while the remaining parts are likely unreadable without MIME-aware tools. Send mail to mime@docserver.cac.washington.edu for more info. --655616-1918233271-985532017=:6469 Content-Type: TEXT/PLAIN; charset=US-ASCII On Mon, 19 Mar 2001, Linus Torvalds wrote: > The complete changelog is appended, but the biggest recent change is > the mmap_sem change, which I updated with new locking rules for > pte/pmd_alloc to avoid the race on the actual page table build. > > This has only been tested on i386 without PAE, and is known to break > other architectures. Ingo, mind checking what PAE needs? [...] one nontrivial issue was that on PAE the pgd has to be installed with 'present' pgd entries, due to a CPU erratum. This means that the pgd_present() code in mm/memory.c, while correct theoretically, doesnt work with PAE. An equivalent solution is to use !pgd_none(), which also works with the PAE workaround. PAE mode could re-define pgd_present() to filter out the workaround - do you prefer this to the !pgd_none() solution? the rest was pretty straightforward. in any case, with the attached pae-2.4.3-A4 patch (against 2.4.3-pre7, applies to 2.4.2-ac24 cleanly as well) applied, 2.4.3-pre7 boots & works just fine on PAE 64GB-HIGHMEM and non-PAE kernels. - the patch also does another cleanup: removes various bad_pagetable code snippets all around the x86 tree, it's not needed anymore. This saves 8 KB RAM on x86 systems. - removed the last remaining *_kernel() macro. - fixed a minor clear_page() bug in pgalloc.h, gfp() could fail in the future. 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