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References: <20211220140142.922323-1-frederic@kernel.org>
In-Reply-To: <20211220140142.922323-1-frederic@kernel.org>
From:   Ard Biesheuvel <ardb@kernel.org>
Date:   Mon, 20 Dec 2021 15:03:36 +0100
Message-ID: <CAMj1kXEBWJVGtRVKRkxeJc5bj4Cbb9oA_67PyJDYhTwiaHc7jA@mail.gmail.com>
Subject: Re: [GIT PULL] arm64: Support dynamic preemption v3
To:     Frederic Weisbecker <frederic@kernel.org>
Cc:     LKML <linux-kernel@vger.kernel.org>,
        Steven Rostedt <rostedt@goodmis.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Kees Cook <keescook@chromium.org>,
        James Morse <james.morse@arm.com>,
        David Laight <David.Laight@aculab.com>,
        Sami Tolvanen <samitolvanen@google.com>,
        Josh Poimboeuf <jpoimboe@redhat.com>,
        Andy Lutomirski <luto@kernel.org>,
        Quentin Perret <qperret@google.com>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Will Deacon <will@kernel.org>,
        Mark Rutland <mark.rutland@arm.com>
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Hello Frederic,

On Mon, 20 Dec 2021 at 15:01, Frederic Weisbecker <frederic@kernel.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(-)