Re: [PATCH] Fix mmap_kmem (was: [question] What's the difference between /dev/kmem and /dev/mem)

From: Steven Rostedt (rostedt_at_goodmis.org)
Date: 08/12/05

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    Date:	Fri, 12 Aug 2005 13:32:38 -0400 (EDT)
To: Arjan van de Ven <arjan@infradead.org>

    On Fri, 12 Aug 2005, Arjan van de Ven wrote:
    > > Again, I'm asking to have it turned into a config option. Even default to
    > > off. I understand that /dev/kmem shouldn't be in a production machine.
    > > There's no reason for it. But it is nice to have when debugging the
    > > kernel. I'll make the changes if need be, to make this into a config
    > > option (placed in the kernel debug section). I'll even maintain it to
    > > keep it working. But I don't want yet another thing I need to write
    > > myself for debugging the kernel.
    >
    > and /proc/kcore doesn't cut it for you?

    I don't know. Can I mmap kcore, set up a function that I want to try out
    before putting in the kernel, have it modify the variables that are
    mmapped, and see if all works?

    Also, I've only used /proc/kcore with gdb, I never wrote my own core
    parsing programs.

    I like to do some strange things when adding stuff to the kernel, and
    mapping /dev/mem to get to kernel globals from user space was one of
    them. I didn't just monitor, I did modify things as well. But this was
    all for R&D and testing. Never for the final product, so that's why I
    don't mind a config option, even under kernel debug.

    -- Steve

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