From nobody Sat Feb 7 08:42:41 2026 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 5847826F2BE for ; Mon, 2 Feb 2026 15:57:50 +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=1770047870; cv=none; b=UfcuWywNJ/jG0l4sZT67gLwS3L/ufbFM11HvguutFxpdFPGVN/yTPqES5OBfEwlwMORGxUamg/+B6WPKLVMXRWnYILhjlWb89sdJgvg+44cZaP7SujeSqpEBHGRgOJmspHPjkiZOuRf85n/FmEpDcllAkSL3DLyezzb+Bm3QkUA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770047870; c=relaxed/simple; bh=VrUiLq75DGzOguYtbXE6XDIwgQv8ey6yUw/4kWmprNw=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ha9B51d3Ntfa99/jeiJ+4LWqOzCC6NvvShpxqs7gknNgCHffKJXoVj4qGOn5etNNfRjJHyN+pT+Q11G+Des24Nstt32VCLFBLB2+cnyZKC5cSFyEKnoZNWFeBCBRY0tLOobEogOpRJYPyxboJoitcyWIQ9XJtSAm9hsu/gErHDo= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=EvtcO+aQ; 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="EvtcO+aQ" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 836DBC4AF0B; Mon, 2 Feb 2026 15:57:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1770047870; bh=VrUiLq75DGzOguYtbXE6XDIwgQv8ey6yUw/4kWmprNw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=EvtcO+aQ9OQr4h7jVSo1frzhSOxnbEFza5TzKINdvokRgHhzCFihUKNirsH5eRqQI o+nHAnSP3Eoi0bhKqFBJ3u2eSv+qnLcMX9Vd2tQiKRGw4ttIeXYOU/ERlhl5MqOJul PsuLlBgmcEFXn0AuZ32ZOEVEX45Clr5tA5fO+yadkQQj6G6HdMqxFhw3mFdUjHHBXr myrGdBa3SKJ4aSeOQEMvIpP8bh9ers08+Fo6MriW9fAD03sNqBn+9zezmIGd4gom+G jyzYK0M9VwIuZH5OcQeH0iR1bKf5iuEY+RTC0/SsnYMbsljNln0//btttmiAeZNY0x c5pO5QBbZGNjQ== Received: from phl-compute-06.internal (phl-compute-06.internal [10.202.2.46]) by mailfauth.phl.internal (Postfix) with ESMTP id AE3FCF40069; Mon, 2 Feb 2026 10:57:48 -0500 (EST) Received: from phl-frontend-04 ([10.202.2.163]) by phl-compute-06.internal (MEProxy); Mon, 02 Feb 2026 10:57:48 -0500 X-ME-Sender: X-ME-Received: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgeefgedrtddtgddujeektdeiucetufdoteggodetrf dotffvucfrrhhofhhilhgvmecuhfgrshhtofgrihhlpdfurfetoffkrfgpnffqhgenuceu rghilhhouhhtmecufedttdenucesvcftvggtihhpihgvnhhtshculddquddttddmnecujf gurhephffvvefufffkofgjfhgggfestdekredtredttdenucfhrhhomhepmfhirhihlhcu ufhhuhhtshgvmhgruhcuoehkrghssehkvghrnhgvlhdrohhrgheqnecuggftrfgrthhtvg hrnhephfdufeejhefhkedtuedvfeevjeffvdfhvedtudfgudffjeefieekleehvdetvdev necuvehluhhsthgvrhfuihiivgepudenucfrrghrrghmpehmrghilhhfrhhomhepkhhirh hilhhlodhmvghsmhhtphgruhhthhhpvghrshhonhgrlhhithihqdduieduudeivdeiheeh qddvkeeggeegjedvkedqkhgrsheppehkvghrnhgvlhdrohhrghesshhhuhhtvghmohhvrd hnrghmvgdpnhgspghrtghpthhtohepvdekpdhmohguvgepshhmthhpohhuthdprhgtphht thhopegrkhhpmheslhhinhhugidqfhhouhhnuggrthhiohhnrdhorhhgpdhrtghpthhtoh epmhhutghhuhhnrdhsohhngheslhhinhhugidruggvvhdprhgtphhtthhopegurghvihgu sehrvgguhhgrthdrtghomhdprhgtphhtthhopeifihhllhihsehinhhfrhgruggvrggurd horhhgpdhrtghpthhtohepuhhsrghmrggrrhhifheigedvsehgmhgrihhlrdgtohhmpdhr tghpthhtohepfhhvughlsehgohhoghhlvgdrtghomhdprhgtphhtthhopehoshgrlhhvrg guohhrsehsuhhsvgdruggvpdhrtghpthhtoheprhhpphhtsehkvghrnhgvlhdrohhrghdp rhgtphhtthhopehvsggrsghkrgesshhushgvrdgtii X-ME-Proxy: Feedback-ID: i10464835:Fastmail Received: by mail.messagingengine.com (Postfix) with ESMTPA; Mon, 2 Feb 2026 10:57:46 -0500 (EST) From: Kiryl Shutsemau To: Andrew Morton , Muchun Song , David Hildenbrand , Matthew Wilcox , Usama Arif , Frank van der Linden Cc: 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, Kiryl Shutsemau Subject: [PATCHv6 08/17] mm: Make page_zonenum() use head page Date: Mon, 2 Feb 2026 15:56:24 +0000 Message-ID: <20260202155634.650837-9-kas@kernel.org> X-Mailer: git-send-email 2.51.2 In-Reply-To: <20260202155634.650837-1-kas@kernel.org> References: <20260202155634.650837-1-kas@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" With the upcoming changes to HVO, a single page of tail struct pages will be shared across all huge pages of the same order on a node. Since huge pages on the same node may belong to different zones, the zone information stored in shared tail page flags would be incorrect. Always fetch zone information from the head page, which has unique and correct zone flags for each compound page. Signed-off-by: Kiryl Shutsemau Acked-by: Zi Yan Acked-by: Muchun Song --- include/linux/mmzone.h | 1 + 1 file changed, 1 insertion(+) diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h index be8ce40b5638..192143b5cdc0 100644 --- a/include/linux/mmzone.h +++ b/include/linux/mmzone.h @@ -1219,6 +1219,7 @@ static inline enum zone_type memdesc_zonenum(memdesc_= flags_t flags) =20 static inline enum zone_type page_zonenum(const struct page *page) { + page =3D compound_head(page); return memdesc_zonenum(page->flags); } =20 --=20 2.51.2