linux-kernel - Re: [GIT PULL] arm64: Support dynamic preemption v3

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Date:   Mon, 20 Dec 2021 15:03:36 +0100
From:   Ard Biesheuvel <ardb@...nel.org>
To:     Frederic Weisbecker <frederic@...nel.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Kees Cook <keescook@...omium.org>,
        James Morse <james.morse@....com>,
        David Laight <David.Laight@...lab.com>,
        Sami Tolvanen <samitolvanen@...gle.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Andy Lutomirski <luto@...nel.org>,
        Quentin Perret <qperret@...gle.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Mark Rutland <mark.rutland@....com>
Subject: Re: [GIT PULL] arm64: Support dynamic preemption v3

Hello Frederic,

On Mon, 20 Dec 2021 at 15:01, Frederic Weisbecker <frederic@...nel.org> wrote:
>
> Hi,
>
> I haven't seen much comments on the static key based version from Mark
> so I don't know which direction we'll eventually take. I still hope we
> can focus on a unified static call based implementation, considering
> there are other users waiting on arm64 static calls.
>

Which other users are you referring to here?

> So here is a rebase against the latest tip:sched/core and arm64 static
> call proposal.
>
> git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git
>         preempt/arm-v4
>
> HEAD: 6fc1c7e3d83c4e06b019b041894d9bb25f37ac6c
>
> Thanks,
>         Frederic
> ---
>
> Frederic Weisbecker (3):
>       sched/preempt: Prepare for supporting !CONFIG_GENERIC_ENTRY dynamic preemption
>       arm64: Implement IRQ exit preemption static call for dynamic preemption
>       arm64: Implement HAVE_PREEMPT_DYNAMIC
>
> Ard Biesheuvel (2):
>       static_call: Use non-function types to refer to the trampolines
>       arm64: implement support for static call trampolines
>
>
>  arch/Kconfig                         |  1 -
>  arch/arm64/Kconfig                   |  3 ++
>  arch/arm64/include/asm/preempt.h     | 23 ++++++++++-
>  arch/arm64/include/asm/static_call.h | 40 +++++++++++++++++++
>  arch/arm64/kernel/entry-common.c     | 15 +++++--
>  arch/arm64/kernel/patching.c         | 77 ++++++++++++++++++++++++++++++++++--
>  arch/arm64/kernel/vmlinux.lds.S      |  1 +
>  include/linux/entry-common.h         |  3 +-
>  include/linux/static_call.h          |  4 +-
>  include/linux/static_call_types.h    | 11 ++++--
>  kernel/sched/core.c                  |  6 ++-
>  11 files changed, 168 insertions(+), 16 deletions(-)