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Date:   Wed, 9 Nov 2022 07:36:59 +0100
From:   Alexander Gordeev <agordeev@linux.ibm.com>
To:     Linus Torvalds <torvalds@linux-foundation.org>
Cc:     Hugh Dickins <hughd@google.com>,
        Johannes Weiner <hannes@cmpxchg.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCH 1/4] mm: introduce 'encoded' page pointers with embedded
 extra bits
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 <20221108194139.57604-1-torvalds@linux-foundation.org>
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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!