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    SubjectRe: [PATCH 0/5] Persist printk buffer across reboots.
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    From: Avery Pennarun <apenwarr@gmail.com>
    Date: Tue, 13 Mar 2012 03:14:21 -0400

    > On Tue, Mar 13, 2012 at 2:50 AM, David Miller <davem@davemloft.net> wrote:
    >> The idea is that you call prom_retain() before you take a look at what
    >> physical memory is available in the kernel, and the firmware takes
    >> this physical chunk out of those available memory lists upon
    >> prom_retain() success.
    >
    > This sounds like exactly the API I would have wanted, however:
    >
    > 1) It's only available in arch/sparc so I can't test my patch if I try
    > to use it;
    > 2) There's nobody that calls it so it might not work;
    > 3) I don't understand the API so I'm not really confident that
    > reserving memory this way will actually prevent it from being seen by
    > the kernel.
    >
    > In short, I think I would screw it up.

    I'm only saying that you should design your stuff such that an
    architecture with such features could easily hook into it using this
    kind facility.


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