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    Subject[PATCH 1/3] e820_update_range(): Strip size of original region
    This patch fixes a bug in e820_update_range(): Previously, if a region was
    partially covered, then e820_update_range() only added a new E820 range but
    didn't update the end/size of the previous range. That lead to duplicate
    covering of a region.

    Patch tested on i386 and x86-64 with patch that uses e820_update_range()
    to limit the E820 map when "mem" parameter is specified on the command line.

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

    diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c
    index e285ea3..e466073 100644
    --- a/arch/x86/kernel/e820.c
    +++ b/arch/x86/kernel/e820.c
    @@ -422,6 +422,7 @@ u64 __init e820_update_range(u64 start, u64 size, unsigned old_type,
    final_end = min(start + size, ei->addr + ei->size);
    if (final_start >= final_end)
    + ei->size -= final_end - final_start;
    e820_add_region(final_start, final_end - final_start,
    real_updated_size += final_end - final_start;

     \ /
      Last update: 2008-06-24 16:37    [W:0.018 / U:6.192 seconds]
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