linux-kernel - Re: [PATCH 2/3] arm64: Allow to enable PREEMPT

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Message-ID: <20240906113050.GB16124@willie-the-truck>
Date: Fri, 6 Sep 2024 12:30:51 +0100
From: Will Deacon <will@...nel.org>
To: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc: Thomas Gleixner <tglx@...utronix.de>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-riscv@...ts.infradead.org, x86@...nel.org,
	"H. Peter Anvin" <hpa@...or.com>, Albert Ou <aou@...s.berkeley.edu>,
	Borislav Petkov <bp@...en8.de>,
	Catalin Marinas <catalin.marinas@....com>,
	Clark Williams <williams@...hat.com>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Ingo Molnar <mingo@...hat.com>,
	John Ogness <john.ogness@...utronix.de>,
	Palmer Dabbelt <palmer@...belt.com>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Petr Mladek <pmladek@...e.com>,
	Sergey Senozhatsky <senozhatsky@...omium.org>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH 2/3] arm64: Allow to enable PREEMPT_RT.

On Fri, Sep 06, 2024 at 12:59:05PM +0200, Sebastian Andrzej Siewior wrote:
> It is really time.
> 
> arm64 has all the required architecture related changes, that have been
> identified over time, in order to enable PREEMPT_RT. With the recent
> printk changes, the last known road block has been addressed.
> 
> Allow to enable PREEMPT_RT on arm64.
> 
> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
> ---
>  arch/arm64/Kconfig | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
> index 0e5bd38633936..2cce9cb44c31e 100644
> --- a/arch/arm64/Kconfig
> +++ b/arch/arm64/Kconfig
> @@ -101,6 +101,7 @@ config ARM64
>  	select ARCH_SUPPORTS_NUMA_BALANCING
>  	select ARCH_SUPPORTS_PAGE_TABLE_CHECK
>  	select ARCH_SUPPORTS_PER_VMA_LOCK
> +	select ARCH_SUPPORTS_RT
>  	select ARCH_SUPPORTS_HUGE_PFNMAP if TRANSPARENT_HUGEPAGE
>  	select ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH
>  	select ARCH_WANT_COMPAT_IPC_PARSE_VERSION if COMPAT
> -- 
> 2.45.2

Acked-by: Will Deacon <will@...nel.org>

"Let it rip!"

Will