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    SubjectRe: [PATCH 4/9] x86, NMI: Remove DIE_NMI_IPI and add priorties to handlers
    On Tue, Nov 30, 2010 at 05:27:25PM -0500, Don Zickus wrote:
    > When re-ordering how the NMI handles its callbacks, a conversation started
    > asking what DIE_NMI_IPI meant. No one could answer it.

    It should have came from commit

    | commit c4b2bffee2a4115fed2825530f2b906ee2f17bd7
    | Author: Andi Kleen <>
    | Date: Fri Jan 23 18:46:40 2004 -0800
    | [PATCH] x86-64 merge
    | Mainly lots of bug fixes and a few minor features. One change is that
    | it uses drivers/Kconfig now like i386. This requires a few minor changes in
    | outside Kconfig files which I am sending separately.

    Andi do you remember what the initial idea was? Didn't find any user of it
    even in this old commit. Just curious.

    > Noticing that is was wasteful to call the die_chain a second time with just
    > another argument, DIE_NMI_IPI, it was decided to nuke it and add priorities
    > to the die_chain handlers to maintain existing behaviour.
    > This patch replaces DIE_NMI_IPI with the appropriate option, mostly DIE_NMI.
    > Then it adds priorities to those handlers, using a globally defined set of
    > priorities for NMI.
    > The thought is eventually we will just switch the nmi handlers from the
    > die_chain to something more nmi specific.
    > Signed-off-by: Don Zickus <>
    > ---

    Don, maybe switching to say new chains like chain_perf and friends would be
    more readable/clean? I'm not against this patch by any means, but just a thought ;)

    Ie I thought like

    if (!(reason & 0xc0)) {
    if (notify_perf() == NOTIFY_STOP)
    if (notify_die() == NOTIFY_STOP)

    Or there is something obvious I'm missing?

    Again, just a thought.


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