linux-kernel - Re: [RFC PATCH v3 03/10] task_work, sched: Add a _locked variant to task_work

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Message-ID: <20240712103544.GB31100@redhat.com>
Date: Fri, 12 Jul 2024 12:35:45 +0200
From: Oleg Nesterov <oleg@...hat.com>
To: Valentin Schneider <vschneid@...hat.com>
Cc: linux-kernel@...r.kernel.org, rcu@...r.kernel.org,
	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	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>,
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	Zqiang <qiang.zhang1211@...il.com>,
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	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>,
	Jens Axboe <axboe@...nel.dk>
Subject: Re: [RFC PATCH v3 03/10] task_work, sched: Add a _locked variant to
 task_work_cancel()

On 07/11, Valentin Schneider wrote:
>
> Later commits will need to issue a task_work_cancel() from within the
> scheduler with the task's ->pi_lock held.
>
> Add a _locked variant that expects p->pi_lock to be held. Expose it in a
> separate scheduler header file, as this really is a scheduler-only
> interface.
>
> Signed-off-by: Valentin Schneider <vschneid@...hat.com>
> ---
>  kernel/sched/task_work_sched.h | 14 +++++++
>  kernel/task_work.c             | 67 ++++++++++++++++++++++++++--------
>  2 files changed, 66 insertions(+), 15 deletions(-)
>  create mode 100644 kernel/sched/task_work_sched.h

I am not sure the new task_work_sched.h makes sense, but I won't argue.

Reviewed-by: Oleg Nesterov <oleg@...hat.com>