linux-kernel - Re: [RFC PATCH v3 01/10] rcuwait: Split type definition to its own header

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Message-ID: <20240712151547.GP27299@noisy.programming.kicks-ass.net>
Date: Fri, 12 Jul 2024 17:15:47 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: Valentin Schneider <vschneid@...hat.com>
Cc: linux-kernel@...r.kernel.org, rcu@...r.kernel.org,
	Ingo Molnar <mingo@...hat.com>, Juri Lelli <juri.lelli@...hat.com>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Dietmar Eggemann <dietmar.eggemann@....com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
	Phil Auld <pauld@...hat.com>, Clark Williams <williams@...hat.com>,
	Tomas Glozar <tglozar@...hat.com>,
	"Paul E. McKenney" <paulmck@...nel.org>,
	Frederic Weisbecker <frederic@...nel.org>,
	Neeraj Upadhyay <neeraj.upadhyay@...nel.org>,
	Joel Fernandes <joel@...lfernandes.org>,
	Josh Triplett <josh@...htriplett.org>,
	Boqun Feng <boqun.feng@...il.com>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Lai Jiangshan <jiangshanlai@...il.com>,
	Zqiang <qiang.zhang1211@...il.com>,
	Alexander Gordeev <agordeev@...ux.ibm.com>,
	Catalin Marinas <catalin.marinas@....com>,
	Arnd Bergmann <arnd@...db.de>, Guo Ren <guoren@...nel.org>,
	Palmer Dabbelt <palmer@...osinc.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Oleg Nesterov <oleg@...hat.com>, Jens Axboe <axboe@...nel.dk>
Subject: Re: [RFC PATCH v3 01/10] rcuwait: Split type definition to its own
 header

On Thu, Jul 11, 2024 at 02:59:55PM +0200, Valentin Schneider wrote:
> A later commit will add a struct irq_work member to struct task_struct, which
> would require <linux/sched.h> to include the definition of struct
> irq_work.
> 
> Thanks to header dependency hell, incudling <linux/irq_work.h> in <linux/sched.h>
> results in defining inline helpers using not-yet-defined fields (mm_struct,
> task_struct, various task states...).
> 
> Break off the definition of struct rcuwait into its own header file.
> 
> Signed-off-by: Valentin Schneider <vschneid@...hat.com>
> ---
>  include/linux/rcuwait.h       |  9 ++-------
>  include/linux/rcuwait_types.h | 16 ++++++++++++++++
>  2 files changed, 18 insertions(+), 7 deletions(-)
>  create mode 100644 include/linux/rcuwait_types.h
> 
> diff --git a/include/linux/rcuwait.h b/include/linux/rcuwait.h
> index 27343424225cf..1f1ca7d38cdf8 100644
> --- a/include/linux/rcuwait.h
> +++ b/include/linux/rcuwait.h
> @@ -5,17 +5,12 @@
>  #include <linux/rcupdate.h>
>  #include <linux/sched/signal.h>
>  
> +#include <linux/rcuwait_types.h>
> +
>  /*
>   * rcuwait provides a way of blocking and waking up a single
>   * task in an rcu-safe manner.
> - *
> - * The only time @task is non-nil is when a user is blocked (or
> - * checking if it needs to) on a condition, and reset as soon as we
> - * know that the condition has succeeded and are awoken.
>   */
> -struct rcuwait {
> -	struct task_struct __rcu *task;
> -};
>  
>  #define __RCUWAIT_INITIALIZER(name)		\
>  	{ .task = NULL, }
> diff --git a/include/linux/rcuwait_types.h b/include/linux/rcuwait_types.h
> new file mode 100644
> index 0000000000000..60a4385a2c368
> --- /dev/null
> +++ b/include/linux/rcuwait_types.h
> @@ -0,0 +1,16 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +#ifndef _LINUX_RCUWAIT_TYPES_H_
> +#define _LINUX_RCUWAIT_TYPES_H_
> +
> +#include <linux/sched.h>
> +
> +/*
> + * The only time @task is non-nil is when a user is blocked (or
> + * checking if it needs to) on a condition, and reset as soon as we
> + * know that the condition has succeeded and are awoken.
> + */
> +struct rcuwait {
> +	struct task_struct __rcu *task;
> +};
> +
> +#endif

Can't we simplu stick this in include/linux/types.h ?