linux-kernel - Re: [PATCH v4 1/4] mm: memcontrol: use helpers to access page's memcg data

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Message-ID: <20201001134638.GE469663@cmpxchg.org>
Date:   Thu, 1 Oct 2020 09:46:38 -0400
From:   Johannes Weiner <hannes@...xchg.org>
To:     Roman Gushchin <guro@...com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Shakeel Butt <shakeelb@...gle.com>,
        Michal Hocko <mhocko@...nel.org>, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, kernel-team@...com
Subject: Re: [PATCH v4 1/4] mm: memcontrol: use helpers to access page's
 memcg data

On Wed, Sep 30, 2020 at 05:27:07PM -0700, Roman Gushchin wrote:
> +/*
> + * set_page_memcg - associate a page with a memory cgroup
> + * @page: a pointer to the page struct
> + * @memcg: a pointer to the memory cgroup
> + *
> + * Associates a page with a memory cgroup.
> + */
> +static inline void set_page_memcg(struct page *page, struct mem_cgroup *memcg)
> +{
> +	VM_BUG_ON_PAGE(PageSlab(page), page);
> +
> +	/*
> +	 * Please, refer to page_memcg()'s description for the page and memcg
> +	 * binding stability requirements.
> +	 */
> +	page->memcg_data = (unsigned long)memcg;
> +}

Please delete and inline this as per previous feedback, thanks.