From: Tejun Heo <tj@kernel.org>
To: JP Kobryn <inwardvessel@gmail.com>
Cc: klarasmodin@gmail.com, shakeel.butt@linux.dev,
yosryahmed@google.com, mkoutny@suse.com, hannes@cmpxchg.org,
akpm@linux-foundation.org, linux-mm@kvack.org,
cgroups@vger.kernel.org, kernel-team@meta.com
Subject: Re: [PATCH cgroup/for-6.16] cgroup: avoid per-cpu allocation of size zero rstat cpu locks
Date: Wed, 21 May 2025 15:55:49 -1000 [thread overview]
Message-ID: <aC6EJRUDPMoMA6Y3@slm.duckdns.org> (raw)
In-Reply-To: <20250522013202.185523-1-inwardvessel@gmail.com>
On Wed, May 21, 2025 at 06:32:02PM -0700, JP Kobryn wrote:
> Subsystem rstat locks are dynamically allocated per-cpu. It was discovered
> that a panic can occur during this allocation when the lock size is zero.
> This is the case on non-smp systems, since arch_spinlock_t is defined as an
> empty struct. Prevent this allocation when !CONFIG_SMP by adding a
> pre-processor conditional around the affected block.
>
> Signed-off-by: JP Kobryn <inwardvessel@gmail.com>
> Reported-by: Klara Modin <klarasmodin@gmail.com>
> Fixes: 748922dcfabd ("cgroup: use subsystem-specific rstat locks to avoid contention")
Applied to cgroup/for-6.16.
Thanks.
--
tejun
next prev parent reply other threads:[~2025-05-22 1:55 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-05-22 1:32 JP Kobryn
2025-05-22 1:55 ` Tejun Heo [this message]
2025-05-22 13:22 ` Klara Modin
2025-06-03 3:38 ` Guenter Roeck
2025-06-03 4:10 ` Shakeel Butt
2025-06-03 4:26 ` Guenter Roeck
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