linux-kernel - [patch V4 0/2] smp: Make softirq handling RT friendly

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Date:   Tue, 12 Apr 2022 22:51:45 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     Christoph Hellwig <hch@...radead.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Subject: [patch V4 0/2] smp: Make softirq handling RT friendly

The invocation of do_softirq() in flush_smp_call_function_from_idle()
breaks on RT because RT does not provide do_softirq().

Aside of that flush_smp_call_function_from_idle() is a misnomer since the
function is invoked not only from idle, but also from the scheduler
migration thread.

The following series addresses this. Changes vs. V3, which can be found
here: https://lore.kernel.org/lkml/YgKgL6aPj8aBES6G@linutronix.de

  - Rename flush_smp_call_function_from_idle() and add comments

  - Confine the RT specifics in the softirq code

Thanks,

	tglx
---
 include/linux/interrupt.h |    9 +++++++++
 kernel/sched/core.c       |    2 +-
 kernel/sched/idle.c       |    2 +-
 kernel/sched/sched.h      |    4 ++--
 kernel/smp.c              |   32 ++++++++++++++++++++++++--------
 kernel/softirq.c          |   13 +++++++++++++
 6 files changed, 50 insertions(+), 12 deletions(-)