Re: usage of DEFINE_WAIT_OVERRIDE_MAP(LD_WAIT_SLEEP)

[Oleg Nesterov <oleg@redhat.com>]

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
>