linux-kernel - [PATCH 0/5] context_tracking: Flatter archs not using exception

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Message-Id: <20201005104919.5250-1-frederic@kernel.org>
Date:   Mon,  5 Oct 2020 12:49:14 +0200
From:   Frederic Weisbecker <frederic@...nel.org>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     Frederic Weisbecker <frederic@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        "Paul E . McKenney" <paulmck@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Phil Auld <pauld@...hat.com>,
        Marcelo Tosatti <mtosatti@...hat.com>
Subject: [PATCH 0/5] context_tracking: Flatter archs not using exception_enter/exit()

In order to be able to turn on/off nohz_full at runtime, we'll need
the archs to give up saving the context tracking state on the task stack
because this forces context tracking to run system wide, even on CPUs
that don't have nohz_full enabled.

Now being able to do so require sane entry code meeting some
requirements that at least x86 just achieved recently (I haven't checked
other archs yet).

git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git
	core/isolation

HEAD: d52271b6d5d02ead1916d65b013d11a7d90501b9

Thanks,
	Frederic
---

Frederic Weisbecker (5):
      context_tracking: Introduce HAVE_CONTEXT_TRACKING_OFFSTACK
      context_tracking:  Don't implement exception_enter/exit() on CONFIG_HAVE_CONTEXT_TRACKING_OFFSTACK
      sched: Detect call to schedule from critical entry code
      context_tracking: Only define schedule_user() on !HAVE_CONTEXT_TRACKING_OFFSTACK archs
      x86: Support HAVE_CONTEXT_TRACKING_OFFSTACK


 arch/Kconfig                     | 17 +++++++++++++++++
 arch/x86/Kconfig                 |  1 +
 include/linux/context_tracking.h |  6 ++++--
 kernel/sched/core.c              |  3 ++-
 4 files changed, 24 insertions(+), 3 deletions(-)