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

Peter Zijlstra
2025-02-10T10:21:46Z

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.