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SubjectRe: [PATCH v10 2/5] sched: CGroup tagging interface for core scheduling
On Fri, Jan 22, 2021 at 08:17:01PM -0500, Joel Fernandes (Google) wrote:

> +#ifdef CONFIG_SCHED_DEBUG
> + /* Read the group cookie. */
> + {
> + .name = "core_group_cookie",
> + .flags = CFTYPE_NOT_ON_ROOT,
> + .read_u64 = cpu_core_group_cookie_read_u64,
> + },
> +#endif

> +#ifdef CONFIG_SCHED_DEBUG
> + /* Read the group cookie. */
> + {
> + .name = "core_group_cookie",
> + .flags = CFTYPE_NOT_ON_ROOT,
> + .read_u64 = cpu_core_group_cookie_read_u64,
> + },
> +#endif

AFAICT this leaks kernel pointers. IIRC that was a bad thing.

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