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From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To: Ankur Arora <ankur.a.arora@oracle.com>
Cc: linux-kernel@vger.kernel.org, peterz@infradead.org, tglx@linutronix.de,
	paulmck@kernel.org, mingo@kernel.org, juri.lelli@redhat.com,
	vincent.guittot@linaro.org, dietmar.eggemann@arm.com,
	rostedt@goodmis.org, bsegall@google.com, mgorman@suse.de,
	vschneid@redhat.com, frederic@kernel.org, efault@gmx.de
Subject: Re: [PATCH 3/7] rcu: fix header guard for rcu_all_qs()
Message-ID: <20241010064123.WJjDYegr@linutronix.de>
References: <20241009165411.3426937-1-ankur.a.arora@oracle.com>
 <20241009165411.3426937-4-ankur.a.arora@oracle.com>
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In-Reply-To: <20241009165411.3426937-4-ankur.a.arora@oracle.com>

On 2024-10-09 09:54:07 [-0700], Ankur Arora wrote:
> rcu_all_qs() is defined for !CONFIG_PREEMPT_RCU but the declaration
> is conditioned on CONFIG_PREEMPTION.
> 
> With CONFIG_PREEMPT_LAZY, CONFIG_PREEMPTION=y does not imply
> CONFIG_PREEMPT_RCU=y.

>From kernel/rcu/Kconfig:
| config PREEMPT_RCU
|         bool
|         default y if PREEMPTION

this looks like PREEMPT_RCU implies PREEMPTION.

> Decouple the two.

Sebastian