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SubjectRe: [patch 5/5] x86_64: Provide ability to choose using shortcuts for IPI in flat mode.
On Thu, 2 Jun 2005, Ashok Raj wrote:

> This patch provides an option to switch broadcast or use mask version
> for sending IPI's. If CONFIG_HOTPLUG_CPU is defined, we choose not to
> use broadcast shortcuts by default, otherwise we choose broadcast mode
> as default.
> both cases, one can change this via startup cmd line option, to choose
> no-broadcast mode.
> no_ipi_broadcast=1
> This is provided on request from Andi Kleen, since he doesnt agree with
> replacing IPI shortcuts as a solution for CPU hotplug. Without removing
> broadcast IPI's, it would mean lots of new code for __cpu_up() path,
> which would acheive the same results.
> I will send the primitive interface next as a separate patch from this
> patch set.
> Signed-off-by: Ashok Raj <>

Have you already submitted the i386 version? I think it's a sane fix.

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