From nobody Sat Feb 7 15:09:41 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 52A45BA21 for ; Mon, 2 Feb 2026 15:58:38 +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=1770047918; cv=none; b=jAz02HaO5bb1bT4HD4y1AJ6Z7xRJs1oue86ZjHU697stkbgUXGluPiq7hmYJAAkW5bO/RgwlSS/8tPFtllJTxZFWMOQ8ZjF/gvWo2WiPlwKhZ9zo4adF7rGU220MRoYoTL50h+fx2oQ9jy8iVi4gNJ3vW89e6r9a/Uuk1C574vU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770047918; c=relaxed/simple; bh=xBYdRN3sYZ6CyWP7NsrlACbZJA1Cw/lqNiJhnZq7FSU=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=P0nHH/VQsUmRX6XeDQQoyeQxDlRzIQk6CQVoehG7yBFSt1sJnDdlN9AnyREnQj13CFdrBomwptC7H98mMcRbOlSR5CpIgw1HqeuEd6/Q2aPFPUw8JzIsfafsMS74Cizxtgt65R28C8IQx6uUVVqsU/11L+ooWLThNi9NtEY1zq8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=JUuYPjvH; 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="JUuYPjvH" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 85ECAC19422; Mon, 2 Feb 2026 15:58:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1770047918; bh=xBYdRN3sYZ6CyWP7NsrlACbZJA1Cw/lqNiJhnZq7FSU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=JUuYPjvHnLyfoerZQnpfLmN8zC5Uq4UkgI6PydwFpb+a6+d0kLTWxdeqNId5pCQ4S bjHkWdhttVZ2QyojnL4HX77XPmc+hi8J4ogibnqKEWYLSEgY8cCLxBpCuaqZqzkdQu ONqi06hobi0lrIc6QJaLtaTDCXpiwE8UocnZz5DUIHpR35fuMkWqrcRqpyNiQHuiBo qgPiDUyFBDHPB6eYIPo3ORtKtPhz3Rkdvo3Z9ZJvMqPy1mPbkrQ9uiyGPHJnaUg8ji TJQmZ82s5ONBBPon8GTJ0VkWA/7KzhbqvJdl+iF9Jr/1LJ/ANlDIdnRVleRhle+iNr vzuJ1lpcQtyxQ== Received: from phl-compute-04.internal (phl-compute-04.internal [10.202.2.44]) by mailfauth.phl.internal (Postfix) with ESMTP id AD0C6F40069; Mon, 2 Feb 2026 10:58:36 -0500 (EST) Received: from phl-frontend-04 ([10.202.2.163]) by phl-compute-04.internal (MEProxy); Mon, 02 Feb 2026 10:58:36 -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 10:58:34 -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 14/17] mm/hugetlb: Remove hugetlb_optimize_vmemmap_key static key Date: Mon, 2 Feb 2026 15:56:30 +0000 Message-ID: <20260202155634.650837-15-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" The hugetlb_optimize_vmemmap_key static key was used to guard fake head detection in compound_head() and related functions. It allowed skipping the fake head checks entirely when HVO was not in use. With fake heads eliminated and the detection code removed, the static key serves no purpose. Remove its definition and all increment/decrement calls. Signed-off-by: Kiryl Shutsemau Reviewed-by: Muchun Song Acked-by: David Hildenbrand (Arm) --- include/linux/page-flags.h | 2 -- mm/hugetlb_vmemmap.c | 14 ++------------ 2 files changed, 2 insertions(+), 14 deletions(-) diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h index 5a8f6fab2255..1aaa604f4b9b 100644 --- a/include/linux/page-flags.h +++ b/include/linux/page-flags.h @@ -221,8 +221,6 @@ static __always_inline bool compound_info_has_mask(void) return is_power_of_2(sizeof(struct page)); } =20 -DECLARE_STATIC_KEY_FALSE(hugetlb_optimize_vmemmap_key); - static __always_inline unsigned long _compound_head(const struct page *pag= e) { unsigned long info =3D READ_ONCE(page->compound_info); diff --git a/mm/hugetlb_vmemmap.c b/mm/hugetlb_vmemmap.c index 6088fc77865c..bdb68779d7b2 100644 --- a/mm/hugetlb_vmemmap.c +++ b/mm/hugetlb_vmemmap.c @@ -385,9 +385,6 @@ static int vmemmap_remap_alloc(unsigned long start, uns= igned long end, return vmemmap_remap_range(start, end, &walk); } =20 -DEFINE_STATIC_KEY_FALSE(hugetlb_optimize_vmemmap_key); -EXPORT_SYMBOL(hugetlb_optimize_vmemmap_key); - static bool vmemmap_optimize_enabled =3D IS_ENABLED(CONFIG_HUGETLB_PAGE_OP= TIMIZE_VMEMMAP_DEFAULT_ON); static int __init hugetlb_vmemmap_optimize_param(char *buf) { @@ -419,10 +416,8 @@ static int __hugetlb_vmemmap_restore_folio(const struc= t hstate *h, * discarded vmemmap pages must be allocated and remapping. */ ret =3D vmemmap_remap_alloc(vmemmap_start, vmemmap_end, flags); - if (!ret) { + if (!ret) folio_clear_hugetlb_vmemmap_optimized(folio); - static_branch_dec(&hugetlb_optimize_vmemmap_key); - } =20 return ret; } @@ -544,8 +539,6 @@ static int __hugetlb_vmemmap_optimize_folio(const struc= t hstate *h, if (!vmemmap_tail) return -ENOMEM; =20 - static_branch_inc(&hugetlb_optimize_vmemmap_key); - /* * Very Subtle * If VMEMMAP_REMAP_NO_TLB_FLUSH is set, TLB flushing is not performed @@ -581,10 +574,8 @@ static int __hugetlb_vmemmap_optimize_folio(const stru= ct hstate *h, vmemmap_head, vmemmap_tail, vmemmap_pages, flags); out: - if (ret) { - static_branch_dec(&hugetlb_optimize_vmemmap_key); + if (ret) folio_clear_hugetlb_vmemmap_optimized(folio); - } =20 return ret; } @@ -650,7 +641,6 @@ static void __hugetlb_vmemmap_optimize_folios(struct hs= tate *h, register_page_bootmem_memmap(pfn_to_section_nr(spfn), &folio->page, HUGETLB_VMEMMAP_RESERVE_SIZE); - static_branch_inc(&hugetlb_optimize_vmemmap_key); continue; } =20 --=20 2.51.2