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    SubjectRe: [PATCH] ARM: mm: Regarding section when dealing with meminfo
    On Thu, Jan 20, 2011 at 10:11:27AM -0800, Dave Hansen wrote:
    > On Thu, 2011-01-20 at 18:01 +0000, Russell King - ARM Linux wrote:
    > > > The x86 version of show_mem() actually manages to do this without any
    > > > #ifdefs, and works for a ton of configuration options. It uses
    > > > pfn_valid() to tell whether it can touch a given pfn.
    > >
    > > x86 memory layout tends to be very simple as it expects memory to
    > > start at the beginning of every region described by a pgdat and extend
    > > in one contiguous block. I wish ARM was that simple.
    >
    > x86 memory layouts can be pretty funky and have been that way for a long
    > time. That's why we *have* to handle holes in x86's show_mem(). My
    > laptop even has a ~1GB hole in its ZONE_DMA32:

    If x86 is soo funky, I suggest you try the x86 version of show_mem()
    on an ARM platform with memory holes. Make sure you try it with
    sparsemem as well...


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