linux-kernel - Re: [PATCH RT 0/3] riscv: add PREEMPT

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Date:   Tue, 24 Oct 2023 00:40:20 +0800
From:   Jisheng Zhang <jszhang@...nel.org>
To:     "Schaffner, Tobias" <tobias.schaffner@...mens.com>
Cc:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Arnd Bergmann <arnd@...db.de>,
        "linux-riscv@...ts.infradead.org" <linux-riscv@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
        "minda.chen@...rfivetech.com" <minda.chen@...rfivetech.com>
Subject: Re: [PATCH RT 0/3] riscv: add PREEMPT_RT support

On Mon, Oct 23, 2023 at 04:33:13PM +0000, Schaffner, Tobias wrote:
> On 10.05.23 18:24, Jisheng Zhang wrote:
> > This series is to add PREEMPT_RT support to riscv. Compared with last
> > try[1], there are two major changes:
> > 
> > 1. riscv has been converted to Generic Entry. And riscv uses
> > asm-generic/preeempt.h, so we need to patch asm-generic's preeempt to
> > enable lazy preempt support for riscv. This is what patch1 does.
> > However, it duplicates the preempt_lazy_count() defintion, I'm sure
> > there must be an elegant solution. Neverless, it doesn't impact the
> > riscv PREEMPT_RT support itself.
> > 
> > 2. three preparation patches(patch1/2/3 in [1]) has been merged in
> > mainline.
> > 
> > I back-ported the lastest linux-6.3.y-rt patches to the lastest Linus tree,
> > then cook this series.
> > 
> > Link: https://lore.kernel.org/linux-riscv/20220831175920.2806-1-jszhang@kernel.org/
> 
> Any news on this series? Are there any open tasks blocking this?
> I am willing to help, but do not see what's missing to get this merged.

Hi Thomas, Sebastian

could you please review? Any comments are appreciated. or do you want a
rebase on linux-6.5.y-rt?

Thanks

> 
> > Jisheng Zhang (3):
> >    asm-generic/preempt: also check preempt_lazy_count for
> >      should_resched() etc.
> >    riscv: add lazy preempt support
> >    riscv: Allow to enable RT
> > 
> >   arch/riscv/Kconfig                   | 2 ++
> >   arch/riscv/include/asm/thread_info.h | 5 ++++-
> >   arch/riscv/kernel/asm-offsets.c      | 1 +
> >   include/asm-generic/preempt.h        | 8 +++++++-
> >   4 files changed, 14 insertions(+), 2 deletions(-)
> > 
>