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    Subject[PATCH] x86: e820 remove the range instead of update it to reserved
    Date

    also let mem= to print out modified e820 map too

    Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>

    ---
    arch/x86/kernel/e820.c | 11 +++++------
    1 file changed, 5 insertions(+), 6 deletions(-)

    Index: linux-2.6/arch/x86/kernel/e820.c
    ===================================================================
    --- linux-2.6.orig/arch/x86/kernel/e820.c
    +++ linux-2.6/arch/x86/kernel/e820.c
    @@ -1165,6 +1165,8 @@ static void early_panic(char *msg)
    panic(msg);
    }

    +static int userdef __initdata;
    +
    /* "mem=nopentium" disables the 4MB page tables. */
    static int __init parse_memopt(char *p)
    {
    @@ -1180,17 +1182,15 @@ static int __init parse_memopt(char *p)
    }
    #endif

    + userdef = 1;
    mem_size = memparse(p, &p);
    end_user_pfn = mem_size>>PAGE_SHIFT;
    - e820_update_range(mem_size, ULLONG_MAX - mem_size,
    - E820_RAM, E820_RESERVED);
    + e820_remove_range(mem_size, ULLONG_MAX - mem_size, E820_RAM, 1);

    return 0;
    }
    early_param("mem", parse_memopt);

    -static int userdef __initdata;
    -
    static int __init parse_memmap_opt(char *p)
    {
    char *oldp;
    @@ -1230,8 +1230,7 @@ static int __init parse_memmap_opt(char
    e820_add_region(start_at, mem_size, E820_RESERVED);
    } else {
    end_user_pfn = (mem_size >> PAGE_SHIFT);
    - e820_update_range(mem_size, ULLONG_MAX - mem_size,
    - E820_RAM, E820_RESERVED);
    + e820_remove_range(mem_size, ULLONG_MAX - mem_size, E820_RAM, 1);
    }
    return *p == '\0' ? 0 : -EINVAL;
    }

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