linux-kernel - Re: [PATCH 1/4] mm: introduce 'encoded' page pointers with embedded extra bits

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Message-ID: <Y2tKixpO4RO6DgW5@tuxmaker.boeblingen.de.ibm.com>
Date:   Wed, 9 Nov 2022 07:36:59 +0100
From:   Alexander Gordeev <agordeev@...ux.ibm.com>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Hugh Dickins <hughd@...gle.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH 1/4] mm: introduce 'encoded' page pointers with embedded
 extra bits

On Tue, Nov 08, 2022 at 11:41:36AM -0800, Linus Torvalds wrote:

Hi Linus,

[...]

> +struct encoded_page;
> +#define ENCODE_PAGE_BITS 3ul
> +static inline struct encoded_page *encode_page(struct page *page, unsigned long flags)
> +{

Any reaction in case ((flags & ~ENCODE_PAGE_BITS) != 0)?

> +	return (struct encoded_page *)(flags | (unsigned long)page);
> +}

Thanks!