Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753052Ab0KTKGO (ORCPT ); Sat, 20 Nov 2010 05:06:14 -0500 Received: from mail-bw0-f46.google.com ([209.85.214.46]:53985 "EHLO mail-bw0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750914Ab0KTKGM (ORCPT ); Sat, 20 Nov 2010 05:06:12 -0500 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:user-agent:mime-version:to:cc:subject :content-type:content-transfer-encoding; b=Sx3ORGQqIAmkMHfqxMa0rICif11n6lmU7BjEta+T3eWvFxTQXWY5pDSOvfdC4w19/z fEkoAIagSDhovELXZosnIjr4CJ2DCbozGUHt11GuSWSrLD6K+L8ua1+/fRfykQg0bBS6 z2/Y+c0cxCFxotLq/mWjP6efzPDra6iY0+f4U= Message-ID: <4CE79CD3.9040203@gmail.com> Date: Sat, 20 Nov 2010 11:02:59 +0100 From: Marco Stornelli User-Agent: Mozilla/5.0 (X11; U; Linux i686; it; rv:1.9.1.9) Gecko/20100317 SUSE/3.0.4-1.1.1 Thunderbird/3.0.4 MIME-Version: 1.0 To: Linux Kernel CC: Linux Embedded , Linux FS Devel , Andrew Morton , Greg Kroah-Hartman , Tim Bird Subject: [PATCH 14/16 v4] pramfs: write protection Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1678 Lines: 56 From: Marco Stornelli Memory write protection. Signed-off-by: Marco Stornelli --- diff -Nurp linux-2.6.36-orig/fs/pramfs/wprotect.c linux-2.6.36/fs/pramfs/wprotect.c --- linux-2.6.36-orig/fs/pramfs/wprotect.c 1970-01-01 01:00:00.000000000 +0100 +++ linux-2.6.36/fs/pramfs/wprotect.c 2010-10-30 11:59:54.000000000 +0200 @@ -0,0 +1,41 @@ +/* + * FILE NAME fs/pramfs/wprotect.c + * + * BRIEF DESCRIPTION + * + * Write protection for the filesystem pages. + * + * Copyright 2009-2010 Marco Stornelli + * Copyright 2003 Sony Corporation + * Copyright 2003 Matsushita Electric Industrial Co., Ltd. + * 2003-2004 (c) MontaVista Software, Inc. , Steve Longerbeam + * This file is licensed under the terms of the GNU General Public + * License version 2. This program is licensed "as is" without any + * warranty of any kind, whether express or implied. + */ + +#include +#include +#include +#include +#include "pram.h" + +void pram_writeable(void *vaddr, unsigned long size, int rw) +{ + int ret = 0; + unsigned long nrpages = size >> PAGE_SHIFT; + unsigned long addr = (unsigned long)vaddr; + + /* Page aligned */ + addr &= PAGE_MASK; + + if (size & (PAGE_SIZE - 1)) + nrpages++; + + if (rw) + ret = set_memory_rw(addr, nrpages); + else + ret = set_memory_ro(addr, nrpages); + + BUG_ON(ret); +} -- 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/