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

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Message-Id: <20230510162406.1955-1-jszhang@kernel.org>
Date:   Thu, 11 May 2023 00:24:03 +0800
From:   Jisheng Zhang <jszhang@...nel.org>
To:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Schaffner Tobias <tobias.schaffner@...mens.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Arnd Bergmann <arnd@...db.de>
Cc:     linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-arch@...r.kernel.org
Subject: [PATCH RT 0/3] riscv: add PREEMPT_RT support

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/

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(-)

-- 
2.40.1