linux-kernel - Re: [PATCH v6 01/27] mm: Introduce struct folio

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Date:   Thu, 8 Apr 2021 11:01:57 +0200
From:   Rasmus Villemoes <linux@...musvillemoes.dk>
To:     "Matthew Wilcox (Oracle)" <willy@...radead.org>, linux-mm@...ck.org
Cc:     linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-cachefs@...hat.com, linux-afs@...ts.infradead.org
Subject: Re: [PATCH v6 01/27] mm: Introduce struct folio

On 31/03/2021 20.47, Matthew Wilcox (Oracle) wrote:

> +static inline void folio_build_bug(void)
> +{
> +#define FOLIO_MATCH(pg, fl)						\
> +BUILD_BUG_ON(offsetof(struct page, pg) != offsetof(struct folio, fl));
> +
> +	FOLIO_MATCH(flags, flags);
> +	FOLIO_MATCH(lru, lru);
> +	FOLIO_MATCH(mapping, mapping);
> +	FOLIO_MATCH(index, index);
> +	FOLIO_MATCH(private, private);
> +	FOLIO_MATCH(_mapcount, _mapcount);
> +	FOLIO_MATCH(_refcount, _refcount);
> +#ifdef CONFIG_MEMCG
> +	FOLIO_MATCH(memcg_data, memcg_data);
> +#endif
> +#undef FOLIO_MATCH
> +	BUILD_BUG_ON(sizeof(struct page) != sizeof(struct folio));
> +}
> +

Perhaps do this next to the definition of struct folio instead of hiding
it in some arbitrary TU - hint, we have static_assert() that doesn't
need to be in function context. And consider amending FOLIO_MATCH by a
static_assert(__same_type(typeof_member(...), typeof_member(...))).

Rasmus