From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To: Oleg Nesterov <oleg@redhat.com>
Cc: "Luis Claudio R. Goncalves" <lgoncalv@redhat.com>,
Peter Zijlstra <peterz@infradead.org>,
Clark Williams <clrkwllms@kernel.org>,
Steven Rostedt <rostedt@goodmis.org>, Tejun Heo <tj@kernel.org>,
David Vernet <dvernet@meta.com>, Barret Rhoden <brho@google.com>,
Josh Don <joshdon@google.com>, Crystal Wood <crwood@redhat.com>,
linux-kernel@vger.kernel.org, linux-rt-devel@lists.linux.dev,
Juri Lelli <juri.lelli@redhat.com>,
Ben Segall <bsegall@google.com>,
Dietmar Eggemann <dietmar.eggemann@arm.com>,
Ingo Molnar <mingo@redhat.com>, Mel Gorman <mgorman@suse.de>,
Valentin Schneider <vschneid@redhat.com>,
Vincent Guittot <vincent.guittot@linaro.org>,
Thomas Gleixner <tglx@linutronix.de>,
Wander Lairson Costa <wander@redhat.com>
Subject: Re: usage of DEFINE_WAIT_OVERRIDE_MAP(LD_WAIT_SLEEP)
Date: Thu, 23 Oct 2025 21:23:53 +0200 [thread overview]
Message-ID: <20251023192353.Wkng87fi@linutronix.de> (raw)
In-Reply-To: <20251023155339.GE26461@redhat.com>
On 2025-10-23 17:53:40 [+0200], Oleg Nesterov wrote:
> Sebastian,
Hi Oleg,
> sorry. I guess this is my fault, but I can't understand your reply...
> Could you spell please?
So you refer to this:
| /* 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;
spinlock_t on PREEMPT_RT does not use (struct) rt_mutex as the comment
claims. It uses just the basic building block which is "struct
rt_mutex_base". This requires linux/rtmutex.h.
spinlock_t on PREEMPT_RT uses LD_WAIT_CONFIG via SPIN_DEP_MAP_INIT as
!PREEMPT_RT. Nothing changes here.
struct rt_mutex on the other hand uses LD_WAIT_SLEEP and this one is
like struct mutex but with PI.
Sebastian
next prev parent reply other threads:[~2025-10-23 19:23 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-07-07 14:03 [PATCH v6] sched: do not call __put_task_struct() on rt if pi_blocked_on is set Luis Claudio R. Goncalves
2025-07-10 16:19 ` Valentin Schneider
2025-07-14 14:15 ` Sebastian Andrzej Siewior
2025-07-16 10:19 ` [tip: sched/core] sched: Do " tip-bot2 for Luis Claudio R. Goncalves
2025-07-28 20:14 ` [PATCH v6] sched: do " Oleg Nesterov
2025-07-29 7:33 ` Luis Claudio R. Goncalves
2025-07-29 11:47 ` Oleg Nesterov
2025-07-29 12:45 ` Luis Claudio R. Goncalves
2025-07-29 13:09 ` Oleg Nesterov
2025-08-01 10:24 ` Oleg Nesterov
2025-08-01 10:51 ` Luis Claudio R. Goncalves
2025-08-11 10:59 ` Sebastian Andrzej Siewior
2025-08-11 11:06 ` Oleg Nesterov
2025-08-11 12:16 ` Sebastian Andrzej Siewior
2025-08-11 12:19 ` Oleg Nesterov
2025-08-11 12:27 ` Sebastian Andrzej Siewior
2025-10-20 14:53 ` usage of DEFINE_WAIT_OVERRIDE_MAP(LD_WAIT_SLEEP) Oleg Nesterov
2025-10-23 13:53 ` Sebastian Andrzej Siewior
2025-10-23 15:29 ` Oleg Nesterov
2025-10-23 15:37 ` Sebastian Andrzej Siewior
2025-10-23 15:53 ` Oleg Nesterov
2025-10-23 19:23 ` Sebastian Andrzej Siewior [this message]
2025-10-24 10:26 ` Oleg Nesterov
2025-10-24 10:39 ` Sebastian Andrzej Siewior
2025-10-24 15:19 ` Oleg Nesterov
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