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    Subject[PATCH 3/3] Limit E820 map when a user-defined memory map is specified
    Date
    This patch brings back limiting of the E820 map when a user-defined
    E820 map is specified. While the behaviour of i386 (32 bit) was to limit
    the E820 map (and /proc/iomem), the behaviour of x86-64 (64 bit) was not to
    limit.

    That patch limits the E820 map again for both x86 architectures.

    Code was tested for compilation and booting on a 32 bit and 64 bit system.


    Signed-off-by: Bernhard Walle <bwalle@suse.de>
    ---
    arch/x86/kernel/e820.c | 3 +++
    1 files changed, 3 insertions(+), 0 deletions(-)

    diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c
    index 7d1109b..19b7f05 100644
    --- a/arch/x86/kernel/e820.c
    +++ b/arch/x86/kernel/e820.c
    @@ -979,6 +979,8 @@ static int __init parse_memopt(char *p)

    mem_size = memparse(p, &p);
    end_user_pfn = mem_size>>PAGE_SHIFT;
    + e820_update_range(mem_size, ULLONG_MAX, E820_RAM, E820_RESERVED);
    +
    return 0;
    }
    early_param("mem", parse_memopt);
    @@ -1023,6 +1025,7 @@ static int __init parse_memmap_opt(char *p)
    e820_add_region(start_at, mem_size, E820_RESERVED);
    } else {
    end_user_pfn = (mem_size >> PAGE_SHIFT);
    + e820_update_range(mem_size, ULLONG_MAX, E820_RAM, E820_RESERVED);
    }
    return *p == '\0' ? 0 : -EINVAL;
    }
    --
    1.5.4.5


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