From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id CD6EE3ACF1D; Thu, 5 Feb 2026 11:58:46 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770292726; cv=none; b=dQEPZD5dpIyZDFvL6iE+mmzNEgX3OnSW0AmxrC+jAvnr7lgVHwTyvZIHxzKLzFLSq55YaziU3aMOQDinYUsL2Gspl9MOHTyvEZXJyik6sAKzJv9GUhFRtyz9caXRabBghlkvvoTSMpgIqjTOT7vSfwSJBoCcgmHJiyMPiPnrNzw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770292726; c=relaxed/simple; bh=GDq3H3vjByLJ3Ey0kNEDQ9d9kRtQLl25iHAO3wBE/5c=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=khkj+EHp/QlBKvSattL8gJxnqp+KD4/vH1rB8/go8yaMkCJQatsi5AH1FlFJvOZmXzKLd7SasGA+bTNEkjPyQx5J/akqNYhVcHsohrRebg0svZ0Z0oOyaqnhrRvPQ+oMOz1Xu4r+WngYo2M6ZHFJVjUiRmjxm2PfUcXkGEI48y8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=XhP7ik1L; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="XhP7ik1L" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D731FC16AAE; Thu, 5 Feb 2026 11:58:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1770292726; bh=GDq3H3vjByLJ3Ey0kNEDQ9d9kRtQLl25iHAO3wBE/5c=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=XhP7ik1LXXfjNBnyfS22rv87pd9aNzA7BcYBKsfG9RyitOwBNzkdha7F1F7HZtWZr RKBCmDD51vVC22UoKfyH6wrLbffbTfdiC0gTQD1JCJbEACzWG3TJwKQG/VkBznINwu /ZA4R3A3YI4nncmqbyPAzJA02dOTh2cDW8EN8Ao7jJ3aA77B5XeVNy/ovVk5CZ8w8X e1Y+tNsNKXvgMZKwU9kCYPB4yfbIR1uDWadA8KUph+ddThGFdlkvOYT/Qwb5KlwwBB 0Jwoq95Os8O3bf9Vk7HiDT6jtCWjHqVHLE0NxlQQrPerNxMnNkhUWXvnE8Ti5NvXpy eGcEwZJrSTb6A== Message-ID: <8deb6010-3abd-48dd-8b77-40dbf2d48c65@kernel.org> Date: Thu, 5 Feb 2026 12:58:37 +0100 Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCHv6 02/17] mm: Change the interface of prep_compound_tail() To: Kiryl Shutsemau Cc: Andrew Morton , Muchun Song , Matthew Wilcox , Usama Arif , Frank van der Linden , Oscar Salvador , Mike Rapoport , Vlastimil Babka , Lorenzo Stoakes , Zi Yan , Baoquan He , Michal Hocko , Johannes Weiner , Jonathan Corbet , Huacai Chen , WANG Xuerui , Palmer Dabbelt , Paul Walmsley , Albert Ou , Alexandre Ghiti , kernel-team@meta.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, loongarch@lists.linux.dev, linux-riscv@lists.infradead.org References: <20260202155634.650837-1-kas@kernel.org> <20260202155634.650837-3-kas@kernel.org> From: "David Hildenbrand (arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit On 2/5/26 12:35, Kiryl Shutsemau wrote: > On Wed, Feb 04, 2026 at 05:14:12PM +0100, David Hildenbrand (arm) wrote: >> On 2/2/26 16:56, Kiryl Shutsemau wrote: >>> Instead of passing down the head page and tail page index, pass the tail >>> and head pages directly, as well as the order of the compound page. >>> >>> This is a preparation for changing how the head position is encoded in >>> the tail page. >>> >>> Signed-off-by: Kiryl Shutsemau >>> Reviewed-by: Muchun Song >>> Reviewed-by: Zi Yan >>> --- >>> include/linux/page-flags.h | 4 +++- >>> mm/hugetlb.c | 8 +++++--- >>> mm/internal.h | 12 ++++++------ >>> mm/mm_init.c | 2 +- >>> mm/page_alloc.c | 2 +- >>> 5 files changed, 16 insertions(+), 12 deletions(-) >>> >>> diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h >>> index f7a0e4af0c73..8a3694369e15 100644 >>> --- a/include/linux/page-flags.h >>> +++ b/include/linux/page-flags.h >>> @@ -865,7 +865,9 @@ static inline bool folio_test_large(const struct folio *folio) >>> return folio_test_head(folio); >>> } >>> -static __always_inline void set_compound_head(struct page *page, struct page *head) >>> +static __always_inline void set_compound_head(struct page *page, >>> + const struct page *head, >>> + unsigned int order) >> >> Two tab indents please on second+ parameter list whenever you touch code. > > Do we have this coding style preference written down somewhere? Good question. I assume not. But it's what we do in MM :) > > -tip tree wants the opposite. Documentation/process/maintainer-tip.rst: > > When splitting function declarations or function calls, then please align > the first argument in the second line with the first argument in the first > line:: > > I want the editor to do The Right Thing™ without my brain involvement. > Having different coding styles in different corners of the kernel makes > it hard. Yeah, but unavoidable. :) -- Cheers, David