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    Subject[PATCH 14/16 v4] pramfs: write protection
    From: Marco Stornelli <marco.stornelli@gmail.com>

    Memory write protection.

    Signed-off-by: Marco Stornelli <marco.stornelli@gmail.com>
    ---
    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 <marco.stornelli@gmail.com>
    + * 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 <linux/module.h>
    +#include <linux/fs.h>
    +#include <linux/mm.h>
    +#include <linux/io.h>
    +#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);
    +}

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