linux-kernel - Re: [PATCH v5 01/18] zram: sleepable entry locking

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Message-ID: <ma5b36tdfdclkcd3ncp3bi7cnrcv2z5ju36h5ovugagp626xpd@kofvqoyhcc3p>
Date: Thu, 13 Feb 2025 10:42:56 +0900
From: Sergey Senozhatsky <senozhatsky@...omium.org>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Yosry Ahmed <yosry.ahmed@...ux.dev>, Kairui Song <ryncsn@...il.com>, 
	Minchan Kim <minchan@...nel.org>, linux-mm@...ck.org, linux-kernel@...r.kernel.org, 
	Sergey Senozhatsky <senozhatsky@...omium.org>
Subject: Re: [PATCH v5 01/18] zram: sleepable entry locking

On (25/02/13 09:52), Sergey Senozhatsky wrote:
> > > -static int zram_slot_trylock(struct zram *zram, u32 index)
> > > +static void zram_slot_lock_init(struct zram *zram, u32 index)
> > >  {
> > > -	return spin_trylock(&zram->table[index].lock);
> > > +#ifdef CONFIG_DEBUG_LOCK_ALLOC
> > > +	lockdep_init_map(&zram->table[index].lockdep_map, "zram-entry->lock",
> > > +			 &zram->table_lockdep_key, 0);
> > > +#endif
> > > +}
> > > +
> > >  
> > > ...
> > >
> > > +#ifdef CONFIG_DEBUG_LOCK_ALLOC
> > > +	lockdep_register_key(&zram->table_lockdep_key);
> > > +#endif
> > > +
> > 
> > Please check whether all the ifdefs are needed - some of these things
> > have CONFIG_LOCKDEP=n stubs.

The problem is that while functions have LOCKDEP=n stubs, struct members
don't - we still declare table_lockdep_key and lockdep_map only when
DEBUG_LOCK_ALLOC is enabled.