linux-kernel - Re: [PATCH] memcg: Remove the lockdep assert from __mod_objcg

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Message-ID: <20240528134027.OxDASsS3@linutronix.de>
Date: Tue, 28 May 2024 15:40:27 +0200
From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To: "Vlastimil Babka (SUSE)" <vbabka@...nel.org>
Cc: Shakeel Butt <shakeel.butt@...ux.dev>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Michal Hocko <mhocko@...nel.org>,
	Roman Gushchin <roman.gushchin@...ux.dev>,
	Muchun Song <muchun.song@...ux.dev>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] memcg: Remove the lockdep assert from
 __mod_objcg_mlstate().

On 2024-05-28 14:34:55 [+0200], Vlastimil Babka (SUSE) wrote:
> > The safety of the counter update is already ensured by
> > VM_WARN_ON_IRQS_ENABLED() which is part of memcg_stats_lock() and does
> > not require yet another check.
> 
> I think here it's __mod_memcg_lruvec_state() doing the VM_WARN_ON_ as we
> don't go through memcg_stats_lock()?

It is either VM_WARN_ON_IRQS_ENABLED() directly as in
__mod_memcg_lruvec_state() (which is special) or memcg_stats_lock().

Do you want me to rephrase this part?

Sebastian