Quoting Matt Roper (2018-02-01 19:53:13)
> +#include <linux/cgroup.h>
> +
> +#include "i915_drv.h"
> +
> +struct i915_cgroup_data {
> + struct cgroup_driver_data base;
> +};
> +
> +static inline struct i915_cgroup_data *
> +cgrp_to_i915(struct cgroup_driver_data *data)
> +{
Document your requirement that base is offset 0 (required for both
i915_cgroup_alloc and i915_cgroup_free).
BUILD_BUG_ON(offsetof(struct i915_cgroup_data, base));
(or make said code flexible)
> + return container_of(data, struct i915_cgroup_data, base);
> +}
> +
> +static struct cgroup_driver_data *
> +i915_cgroup_alloc(struct cgroup_driver *drv)
> +{
> + struct i915_cgroup_data *data;
> +
> + data = kzalloc(sizeof *data, GFP_KERNEL);
> + return &data->base;
> +}
> +
> +static void
> +i915_cgroup_free(struct cgroup_driver_data *data)
> +{
> + kfree(data);
> +}
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