linux-kernel - Re: [PATCH bpf-next v2 11/26] rqspinlock: Add deadlock detection and recovery

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Message-ID: <20250210102139.GJ10324@noisy.programming.kicks-ass.net>
Date: Mon, 10 Feb 2025 11:21:39 +0100
From: Peter Zijlstra <peterz@...radead.org>
To: Kumar Kartikeya Dwivedi <memxor@...il.com>
Cc: bpf@...r.kernel.org, linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Will Deacon <will@...nel.org>, Waiman Long <llong@...hat.com>,
	Alexei Starovoitov <ast@...nel.org>,
	Andrii Nakryiko <andrii@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Martin KaFai Lau <martin.lau@...nel.org>,
	Eduard Zingerman <eddyz87@...il.com>,
	"Paul E. McKenney" <paulmck@...nel.org>, Tejun Heo <tj@...nel.org>,
	Barret Rhoden <brho@...gle.com>, Josh Don <joshdon@...gle.com>,
	Dohyun Kim <dohyunkim@...gle.com>,
	linux-arm-kernel@...ts.infradead.org, kernel-team@...a.com
Subject: Re: [PATCH bpf-next v2 11/26] rqspinlock: Add deadlock detection and
 recovery

On Thu, Feb 06, 2025 at 02:54:19AM -0800, Kumar Kartikeya Dwivedi wrote:
> +#define RES_NR_HELD 32
> +
> +struct rqspinlock_held {
> +	int cnt;
> +	void *locks[RES_NR_HELD];
> +};

That cnt field makes the whole thing overflow a cacheline boundary.
Making it 31 makes it fit again.