[PATCH RT v2 0/3] riscv: add PREEMPT_RT support

From: Jisheng Zhang <jszhang@kernel.org>
To: Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
	Thomas Gleixner <tglx@linutronix.de>,
	Paul Walmsley <paul.walmsley@sifive.com>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Albert Ou <aou@eecs.berkeley.edu>
Cc: linux-riscv@lists.infradead.org, tobias.schaffner@siemens.com,
	Arnd Bergmann <arnd@arndb.de>,
	Conor Dooley <conor.dooley@microchip.com>
Subject: [PATCH RT v2 0/3] riscv: add PREEMPT_RT support
Date: Tue, 31 Oct 2023 22:35:19 +0800	[thread overview]
Message-ID: <20231031143521.441-1-jszhang@kernel.org> (raw)

This series is to add PREEMPT_RT support to riscv. Compared with last
year's try[1], there are two major changes:

1. riscv has been converted to Generic Entry. And RT maintainers has
introduced PREEMPT_AUTO, so its support for riscv as well.

2. three preparation patches(patch1/2/3 in [1]) has been merged in
mainline.

Link: https://lore.kernel.org/linux-riscv/20220831175920.2806-1-jszhang@kernel.org/ [1]

Hi @Conor,

IIRC, you reported warnings with LOCKDEP(and DEBUG_ATOMIC_SLEEP?) with
previous version RT patch, but I tried on c906, c910 platforms and
can't reproduce the warnings. And Schaffner also tried them and
didn't reproduce warnings either. So could you please help try
v6.6-RT + this series again?

Thanks

Since v1:
 - rebase on v6.6-rt
 - support the new PREEMPT_AUTO instead of Lazy preempt

Jisheng Zhang (2):
  riscv: add PREEMPT_AUTO support
  riscv: allow to enable RT

 arch/riscv/Kconfig                   | 2 ++
 arch/riscv/include/asm/thread_info.h | 2 ++
 2 files changed, 4 insertions(+)

-- 
2.40.1

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