Re: [PATCH net-next v5 1/5] mm: add a signature in struct page

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To: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Subject: Re: [PATCH net-next v5 1/5] mm: add a signature in struct page
From: Matteo Croce <mcroce@xxxxxxxxxxxxxxxxxxx>
Date: Tue, 18 May 2021 17:44:21 +0200
Cc: netdev@xxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, Ayush Sawal <ayush.sawal@xxxxxxxxxxx>, Vinay Kumar Yadav <vinay.yadav@xxxxxxxxxxx>, Rohit Maheshwari <rohitm@xxxxxxxxxxx>, "David S. Miller" <davem@xxxxxxxxxxxxx>, Jakub Kicinski <kuba@xxxxxxxxxx>, Thomas Petazzoni <thomas.petazzoni@xxxxxxxxxxx>, Marcin Wojtas <mw@xxxxxxxxxxxx>, Russell King <linux@xxxxxxxxxxxxxxx>, Mirko Lindner <mlindner@xxxxxxxxxxx>, Stephen Hemminger <stephen@xxxxxxxxxxxxxxxxxx>, Tariq Toukan <tariqt@xxxxxxxxxx>, Jesper Dangaard Brouer <hawk@xxxxxxxxxx>, Ilias Apalodimas <ilias.apalodimas@xxxxxxxxxx>, Alexei Starovoitov <ast@xxxxxxxxxx>, Daniel Borkmann <daniel@xxxxxxxxxxxxx>, John Fastabend <john.fastabend@xxxxxxxxx>, Boris Pismenny <borisp@xxxxxxxxxx>, Arnd Bergmann <arnd@xxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, "Peter Zijlstra (Intel)" <peterz@xxxxxxxxxxxxx>, Vlastimil Babka <vbabka@xxxxxxx>, Yu Zhao <yuzhao@xxxxxxxxxx>, Will Deacon <will@xxxxxxxxxx>, Fenghua Yu <fenghua.yu@xxxxxxxxx>, Roman Gushchin <guro@xxxxxx>, Hugh Dickins <hughd@xxxxxxxxxx>, Peter Xu <peterx@xxxxxxxxxx>, Jason Gunthorpe <jgg@xxxxxxxx>, Jonathan Lemon <jonathan.lemon@xxxxxxxxx>, Alexander Lobakin <alobakin@xxxxx>, Cong Wang <cong.wang@xxxxxxxxxxxxx>, wenxu <wenxu@xxxxxxxxx>, Kevin Hao <haokexin@xxxxxxxxx>, Jakub Sitnicki <jakub@xxxxxxxxxxxxxx>, Marco Elver <elver@xxxxxxxxxx>, Willem de Bruijn <willemb@xxxxxxxxxx>, Miaohe Lin <linmiaohe@xxxxxxxxxx>, Yunsheng Lin <linyunsheng@xxxxxxxxxx>, Guillaume Nault <gnault@xxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, linux-rdma@xxxxxxxxxxxxxxx, bpf@xxxxxxxxxxxxxxx, Eric Dumazet <edumazet@xxxxxxxxxx>, David Ahern <dsahern@xxxxxxxxx>, Lorenzo Bianconi <lorenzo@xxxxxxxxxx>, Saeed Mahameed <saeedm@xxxxxxxxxx>, Andrew Lunn <andrew@xxxxxxx>, Paolo Abeni <pabeni@xxxxxxxxxx>, Sven Auhagen <sven.auhagen@xxxxxxxxxxxx>
In-reply-to: <YJ3Lrdx1oIm/MDV8@casper.infradead.org>
References: <20210513165846.23722-1-mcroce@linux.microsoft.com> <20210513165846.23722-2-mcroce@linux.microsoft.com> <YJ3Lrdx1oIm/MDV8@casper.infradead.org>

On Fri, May 14, 2021 at 3:01 AM Matthew Wilcox <willy@xxxxxxxxxxxxx> wrote:
>
> I feel like I want to document the pfmemalloc bit in mm_types.h,
> but I don't have a concrete suggestion yet.
>

Maybe simply:

/* Bit zero is set
 * Bit one if pfmemalloc page
 */
 unsigned long compound_head;

Regards,
-- 
per aspera ad upstream

References:
- [PATCH net-next v5 0/5] page_pool: recycle buffers
  - From: Matteo Croce
- [PATCH net-next v5 1/5] mm: add a signature in struct page
  - From: Matteo Croce
- Re: [PATCH net-next v5 1/5] mm: add a signature in struct page
  - From: Matthew Wilcox

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