From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id F3CD2C71136 for ; Thu, 12 Jun 2025 10:51:44 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 9450E6B008C; Thu, 12 Jun 2025 06:51:44 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 8F4B26B0092; Thu, 12 Jun 2025 06:51:44 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 7E3E36B0093; Thu, 12 Jun 2025 06:51:44 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0015.hostedemail.com [216.40.44.15]) by kanga.kvack.org (Postfix) with ESMTP id 5BAA86B008C for ; Thu, 12 Jun 2025 06:51:44 -0400 (EDT) Received: from smtpin25.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay09.hostedemail.com (Postfix) with ESMTP id 3803380B4C for ; Thu, 12 Jun 2025 10:51:42 +0000 (UTC) X-FDA: 83546432844.25.BF9CF50 Received: from mout-p-201.mailbox.org (mout-p-201.mailbox.org [80.241.56.171]) by imf05.hostedemail.com (Postfix) with ESMTP id A9115100003 for ; Thu, 12 Jun 2025 10:51:40 +0000 (UTC) Authentication-Results: imf05.hostedemail.com; dkim=none; dmarc=fail reason="SPF not aligned (relaxed), No valid DKIM" header.from=samsung.com (policy=none); spf=pass (imf05.hostedemail.com: domain of kernel@pankajraghav.com designates 80.241.56.171 as permitted sender) smtp.mailfrom=kernel@pankajraghav.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1749725500; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=9O6+HKLPiRyogK1FsTj6cKjl6yganVRou6G3cdR2oIY=; b=VqpMJCtupuzrgQJ9tTEhh/NJeA0K3VAY5+DCnAEJNyRA8b0TMMoGb35v4wtslxgpyCAhAl MzZ6FPiRvVMAwusdfu8mmlH8Uix0dp4YlCj2kkMAkUlRU5C3VOj1HOf3r3kDOjqnFV1Hzw HCEVigckh4sA7/Dp3FURWs/nKL85l/4= ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1749725500; a=rsa-sha256; cv=none; b=Kvk4SvNH24h11RjGRYFG5qpP7cpbMVslxIPPPCijjoBkCa2Onp/zJRiurm8uteUOFUvUdn t0ORc8hs36zOpUy1RCfHvKALq0vzpKT9u16Zyhp8GeKSoPbHCvwlnMgPFjz8ATeVbbJ14/ J/imH3YaPMDVXxJJQHqIWjY3LBf74PM= ARC-Authentication-Results: i=1; imf05.hostedemail.com; dkim=none; dmarc=fail reason="SPF not aligned (relaxed), No valid DKIM" header.from=samsung.com (policy=none); spf=pass (imf05.hostedemail.com: domain of kernel@pankajraghav.com designates 80.241.56.171 as permitted sender) smtp.mailfrom=kernel@pankajraghav.com Received: from smtp1.mailbox.org (smtp1.mailbox.org [10.196.197.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by mout-p-201.mailbox.org (Postfix) with ESMTPS id 4bHzqF3rv5z9std; Thu, 12 Jun 2025 12:51:37 +0200 (CEST) From: Pankaj Raghav To: Suren Baghdasaryan , Ryan Roberts , Mike Rapoport , Michal Hocko , Thomas Gleixner , Nico Pache , Dev Jain , Baolin Wang , Borislav Petkov , Ingo Molnar , "H . Peter Anvin" , Vlastimil Babka , Zi Yan , Dave Hansen , David Hildenbrand , Lorenzo Stoakes , Andrew Morton , "Liam R . Howlett" , Jens Axboe Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, willy@infradead.org, x86@kernel.org, linux-block@vger.kernel.org, linux-fsdevel@vger.kernel.org, "Darrick J . Wong" , mcgrof@kernel.org, gost.dev@samsung.com, kernel@pankajraghav.com, hch@lst.de, Pankaj Raghav Subject: [PATCH 4/5] mm: add mm_get_static_huge_zero_folio() routine Date: Thu, 12 Jun 2025 12:50:59 +0200 Message-ID: <20250612105100.59144-5-p.raghav@samsung.com> In-Reply-To: <20250612105100.59144-1-p.raghav@samsung.com> References: <20250612105100.59144-1-p.raghav@samsung.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: A9115100003 X-Stat-Signature: 9hpikx3e98kkxoi1ps81z8a3adhtodos X-Rspam-User: X-HE-Tag: 1749725500-114575 X-HE-Meta: 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 4l4sF178 i6lt61DzSf2Pr9986QRnQMNRa5keFItgOnICwpyTSqsAwEr0o4kQWF1b/VAuyfV495XdKVFWlj+KfLk02z0C6WCxZsCVOLnPER7NJruZQ5Ylfz0wu4bpvvXACuK6UiSTF4vu1BLqOipIL8PBgOpJ+yPKZL8giShVef/VMPUbaeWPsnDzKMi2horlF22wDKktezZ3EtRoSOSw+1v7NRMHT4PI3KJy9S9jjA5C5MQIFaQHsZ2VZIP27c8nTJjSIrFxbDn336FL/W3NqRJSePgX7nXYdV0Qf6cf2vbnWcU4EVDsTdeYLtwDtrSZAi8HoOQEjwEVBQrsO1molLdUq+xIzx0jpEzWXP+4Zi6q7nrdlKKZ3J+FlJMYhuX7OuW4QQHK+Km+66Svhj59G99f1FvfLSx6qz4/k+kR6k4VkcQCR8QOXPwo= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Add mm_get_static_huge_zero_folio() routine so that huge_zero_folio can be used without the need to pass any mm struct. This will return ZERO_PAGE folio if CONFIG_STATIC_PMD_ZERO_PAGE is disabled. This routine can also be called even if THP is disabled. Signed-off-by: Pankaj Raghav --- include/linux/mm.h | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/include/linux/mm.h b/include/linux/mm.h index b20d60d68b3c..c8805480ff21 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -4021,6 +4021,22 @@ static inline bool vma_is_special_huge(const struct vm_area_struct *vma) extern struct folio *huge_zero_folio; extern unsigned long huge_zero_pfn; +/* + * mm_get_static_huge_zero_folio - Get a PMD sized zero folio + * + * This function will return a PMD sized zero folio if CONFIG_STATIC_PMD_ZERO_PAGE + * is enabled. Otherwise, a ZERO_PAGE folio is returned. + * + * Deduce the size of the folio with folio_size instead of assuming the + * folio size. + */ +static inline struct folio *mm_get_static_huge_zero_folio(void) +{ + if(IS_ENABLED(CONFIG_STATIC_PMD_ZERO_PAGE)) + return READ_ONCE(huge_zero_folio); + return page_folio(ZERO_PAGE(0)); +} + #ifdef CONFIG_TRANSPARENT_HUGEPAGE static inline bool is_huge_zero_folio(const struct folio *folio) { -- 2.49.0