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    SubjectRe: [RFC] Scheduler hooks to support separate ia64 MCA/INIT stacks
    On Fri, 9 Sep 2005, Keith Owens wrote:

    > The new ia64 MCA/INIT handlers[1] (think of them as super NMI) run on
    > separate stacks. 99% of the changes for these new handlers is ia64
    > only code, however they need a couple of scheduler hooks to support
    > these extra stacks. The complete patch set will be coming through the
    > ia64 tree, this RFC covers just the scheduler changes, so they do not
    > come as a surprise when the ia64 tree is rolled up.
    >
    > [1] http://marc.theaimsgroup.com/?l=linux-ia64&m=112537827113545&w=2
    > and the following patches.

    Thanks that gave a lot of background.

    > This patch adds two small hooks that can be safely called from MCA/INIT
    > context. If other architectures want to support NMI on separate stacks
    > then they can also use these functions.

    Well x86_64 already does this with NMI being setup as ISTs, the difference
    is that there we use a register to access current (via PDA/%gs). I might
    have missed this in the URL you posted, but how come IA64 can't do this
    via r13?

    Thanks,
    Zwane

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