linux-kernel - Re: usage of DEFINE_WAIT_OVERRIDE_MAP(LD_WAIT

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Message-ID: <20251023155339.GE26461@redhat.com>
Date: Thu, 23 Oct 2025 17:53:40 +0200
From: Oleg Nesterov <oleg@...hat.com>
To: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc: "Luis Claudio R. Goncalves" <lgoncalv@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Clark Williams <clrkwllms@...nel.org>,
	Steven Rostedt <rostedt@...dmis.org>, Tejun Heo <tj@...nel.org>,
	David Vernet <dvernet@...a.com>, Barret Rhoden <brho@...gle.com>,
	Josh Don <joshdon@...gle.com>, Crystal Wood <crwood@...hat.com>,
	linux-kernel@...r.kernel.org, linux-rt-devel@...ts.linux.dev,
	Juri Lelli <juri.lelli@...hat.com>, Ben Segall <bsegall@...gle.com>,
	Dietmar Eggemann <dietmar.eggemann@....com>,
	Ingo Molnar <mingo@...hat.com>, Mel Gorman <mgorman@...e.de>,
	Valentin Schneider <vschneid@...hat.com>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Wander Lairson Costa <wander@...hat.com>
Subject: Re: usage of DEFINE_WAIT_OVERRIDE_MAP(LD_WAIT_SLEEP)

Sebastian,

sorry. I guess this is my fault, but I can't understand your reply...
Could you spell please?

Just in case, I will read your reply tomorrow.

Oleg.

On 10/23, Sebastian Andrzej Siewior wrote:
>
> On 2025-10-23 17:29:43 [+0200], Oleg Nesterov wrote:
> > Hmm. I'll recheck, quite possibly I missed something.
> >
> > But. From include/linux/spinlock_types.h
> >
> > 	/* PREEMPT_RT kernels map spinlock to rt_mutex */
> > 	#include <linux/rtmutex.h>
> >
> > 	typedef struct spinlock {
> > 		struct rt_mutex_base	lock;
> > 	#ifdef CONFIG_DEBUG_LOCK_ALLOC
> > 		struct lockdep_map	dep_map;
> > 	#endif
> > 	} spinlock_t;
> >
> > > rt_mutex is defined as LD_WAIT_SLEEP but this one is not the one we use
> > > for spinlock_t.
>
> I may need to update the comment then if this is the source of your of
> confusion. The rtmutex.h header is required for the rtmutex bits which
> does contain struct rt_mutex_base which is used below you see.
> struct rt_mutex iself is not used here and has a different semantic
> (this one does use SLEEP).
>
> > Oleg.
>
> Sebastian
>