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    SubjectRe: [net-next PATCH v4 0/3] net: reserve ports for applications using fixed port
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    Octavian Purdila <opurdila@ixiacom.com> writes:

    > This iteration makes the bitmap dynamically allocated since it is
    > quite big (8192 bytes) and adding that much in BSS may still,
    > apparently, cause problems on some architectures.
    >
    >
    > Octavian Purdila (3):
    > sysctl: refactor integer handling proc code
    > sysctl: add proc_dobitmap
    > net: reserve ports for applications using fixed port numbers
    >

    I don't like the /proc interface for this. That is certainly not the
    format I would choose for a bitmap. The way you have described this
    it looks like you are a set of different individual values instead of
    one large value. History says one value per file is the ideal in a
    user space facing interface. Intuitively I would not know how to
    change your new proc interface after catting the file. The classic
    read the file tweak the value and write the new value back will not
    work.


    Also we already have a common function for dealing with bitmaps
    in /proc. bitmap_parse_user. Used in /proc/irq/NNN/smp_affinity
    among other places.

    So can you please use bitmap_parse_user, or break this up into
    64k individual files that we can set individually?

    Eric


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