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Date:   Mon, 4 Dec 2017 03:09:16 -0500
From:   Steven Rostedt <>
To:     Juri Lelli <>
Cc:     LKML <>,
        linux-rt-users <>,
        Ingo Molnar <>,
        Peter Zijlstra <>,
        Sebastian Andrzej Siewior <>,
        Daniel Wagner <>,
        Thomas Gleixner <>
Subject: Re: [PATCH] sched/rt: Do not pull from current CPU if only one cpu
 to pull

On Mon, 4 Dec 2017 08:45:17 +0100
Juri Lelli <> wrote:

> Right. I was wondering however if for the truly UP case we shouldn't be
> initiating/queueing callbacks (pull/push) at all?

If !CONFIG_SMP then it's not compiled in. The issue came up when Daniel
ran a CONFIG_SMP kernel on an arch that only supports UP.

> DEADLINE doesn't use (yet?) the PUSH_IPI, but we will need a similar
> patch to keep logics aligned.


-- Steve

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