linux-kernel - Re: [PATCH RFC v2 rcu 2/8] srcu: Create an srcu_read_lock_nmisafe() and srcu_read_unlock

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Date:   Tue, 18 Oct 2022 16:37:01 +0206
From:   John Ogness <john.ogness@...utronix.de>
To:     "Paul E. McKenney" <paulmck@...nel.org>, rcu@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, kernel-team@...com,
        rostedt@...dmis.org, "Paul E. McKenney" <paulmck@...nel.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Petr Mladek <pmladek@...e.com>
Subject: Re: [PATCH RFC v2 rcu 2/8] srcu: Create an srcu_read_lock_nmisafe()
 and srcu_read_unlock_nmisafe()

Hi Paul,

Sorry for the late response here. I am now trying to actually use this
series.

On 2022-09-29, "Paul E. McKenney" <paulmck@...nel.org> wrote:
> diff --git a/kernel/rcu/Kconfig b/kernel/rcu/Kconfig
> index d471d22a5e21..f53ad63b2bc6 100644
> --- a/kernel/rcu/Kconfig
> +++ b/kernel/rcu/Kconfig
> @@ -72,6 +72,9 @@ config TREE_SRCU
>  	help
>  	  This option selects the full-fledged version of SRCU.
>  

You are missing a:

+config ARCH_HAS_NMI_SAFE_THIS_CPU_OPS
+	bool
+

Otherwise there is no CONFIG_ARCH_HAS_NMI_SAFE_THIS_CPU_OPS, so for
example CONFIG_NEED_SRCU_NMI_SAFE always ends up with y on X86.

> +config NEED_SRCU_NMI_SAFE
> +	def_bool HAVE_NMI && !ARCH_HAS_NMI_SAFE_THIS_CPU_OPS && !TINY_SRCU
> +

John