From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750890AbVJNTWH (ORCPT ); Fri, 14 Oct 2005 15:22:07 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750898AbVJNTWH (ORCPT ); Fri, 14 Oct 2005 15:22:07 -0400 Received: from omx1-ext.sgi.com ([192.48.179.11]:23174 "EHLO omx1.americas.sgi.com") by vger.kernel.org with ESMTP id S1750889AbVJNTWF (ORCPT ); Fri, 14 Oct 2005 15:22:05 -0400 Date: Fri, 14 Oct 2005 14:21:55 -0500 From: Robin Holt To: linux-ia64@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, hch@infradead.org, jgarzik@pobox.com, wli@holomorphy.com, Dave Hansen , Jack Steiner Subject: [Patch 1/3] Add a NOPAGE_FAULTED flag. Message-ID: <20051014192155.GC14418@lnx-holt.americas.sgi.com> References: <20051014192111.GB14418@lnx-holt.americas.sgi.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20051014192111.GB14418@lnx-holt.americas.sgi.com> User-Agent: Mutt/1.4.2.1i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Introduce a NOPAGE_FAULTED flag. This flag is returned from a drivers nopage handler to indicate the desired pte has been inserted and should be handled as a minor fault. Signed-off-by: holt@sgi.com Index: linux-2.6/include/linux/mm.h =================================================================== --- linux-2.6.orig/include/linux/mm.h 2005-10-11 21:15:45.147011169 -0500 +++ linux-2.6/include/linux/mm.h 2005-10-11 21:17:15.814561844 -0500 @@ -619,6 +619,7 @@ static inline int page_mapped(struct pag */ #define NOPAGE_SIGBUS (NULL) #define NOPAGE_OOM ((struct page *) (-1)) +#define NOPAGE_FAULTED ((struct page *) (-2)) /* * Different kinds of faults, as returned by handle_mm_fault(). Index: linux-2.6/mm/memory.c =================================================================== --- linux-2.6.orig/mm/memory.c 2005-10-11 21:15:45.162634582 -0500 +++ linux-2.6/mm/memory.c 2005-10-11 21:17:15.849714525 -0500 @@ -1862,6 +1862,14 @@ retry: return VM_FAULT_SIGBUS; if (new_page == NOPAGE_OOM) return VM_FAULT_OOM; + if (new_page == NOPAGE_FAULTED) { + spin_lock(&mm->page_table_lock); + page_table = pte_offset_map(pmd, address); + pte_unmap(page_table); + spin_unlock(&mm->page_table_lock); + + return VM_FAULT_MINOR; + } /* * Should we do an early C-O-W break?