linux-kernel - Re: [PATCH] mm: slub: annotate kmem_cache_node->list_lock as raw

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20230412124836.GF628377@hirez.programming.kicks-ass.net>
Date:   Wed, 12 Apr 2023 14:48:36 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Qi Zheng <zhengqi.arch@...edance.com>
Cc:     Vlastimil Babka <vbabka@...e.cz>,
        "Zhang, Qiang1" <qiang1.zhang@...el.com>,
        Boqun Feng <boqun.feng@...il.com>,
        "42.hyeyoo@...il.com" <42.hyeyoo@...il.com>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "roman.gushchin@...ux.dev" <roman.gushchin@...ux.dev>,
        "iamjoonsoo.kim@....com" <iamjoonsoo.kim@....com>,
        "rientjes@...gle.com" <rientjes@...gle.com>,
        "penberg@...nel.org" <penberg@...nel.org>,
        "cl@...ux.com" <cl@...ux.com>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Zhao Gongyi <zhaogongyi@...edance.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        RCU <rcu@...r.kernel.org>,
        "Paul E . McKenney" <paulmck@...nel.org>
Subject: Re: [PATCH] mm: slub: annotate kmem_cache_node->list_lock as
 raw_spinlock

On Wed, Apr 12, 2023 at 03:30:20PM +0800, Qi Zheng wrote:
> Maybe we should make CONFIG_PROVE_RAW_LOCK_NESTING depend on
> CONFIG_PREEMPT_RT:
> 
> diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
> index f0d5b82e478d..257b170aacb6 100644
> --- a/lib/Kconfig.debug
> +++ b/lib/Kconfig.debug
> @@ -1262,6 +1262,7 @@ config PROVE_LOCKING
>  config PROVE_RAW_LOCK_NESTING
>         bool "Enable raw_spinlock - spinlock nesting checks"
>         depends on PROVE_LOCKING
> +       depends on PREEMPT_RT
>         default n
>         help
>          Enable the raw_spinlock vs. spinlock nesting checks which ensure

No, very much not. The idea is that we want to work towards having this
always enabled (when PROVE_LOCKING) to ensure code gets and stays
PREEMPT_RT clean.