From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (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 2B9FD23AE60 for ; Mon, 3 Mar 2025 16:30:31 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.129.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741019433; cv=none; b=Sn8lnjeqtmFRFbJ7CrHJxDtNkeVeUtSkxYEtpalodbpeZA1esGCml5+YZJ4lhx8CMncvYRG6oetHtwGjpsLDHXAlwHwLFEgAicnRKnxcV9bb7pnUYcZcen7+45GcRKFiQFcVGw/TS9pXnsX4vhZBtPL+yyEpPWySLY91ZrIrEgs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741019433; c=relaxed/simple; bh=PXIkz9IhpVUA0dg2bzzU7MBYAWcAI8b7mocN+X2/mhY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=D4Ggi/4QEmNDvgKowa+tMyTvEoS8l+UKrU+/DXIIwfmT4gLnoKNCQDYvzpoSPsPk3JvCRAEodqPSr6U3jfMYG1WnFBSOwsjj/kt1GjDMLIdRHwTAt2yHLSYcww4bYiZI1090k0+iKfb8r6PQboSCEF25ZLLGoLDHq1WMnSGpBOY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=FnLOrxRh; arc=none smtp.client-ip=170.10.129.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="FnLOrxRh" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1741019431; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=YXwoThNtp+x7X/3NlVobY8ZdtRlIGCn0KXkmBvKPXvw=; b=FnLOrxRhaLhFNEtczYmJrymJ7u+Qy+tQGISSHnxb72+xboLVfAiZQMnW3y7gvlFWrGzktz z6KaiuBMn983Aos3RPYYWcTHHt+o4n3JBAZ56o2WYn8zj9BDJt07D96XqK4MzcMdYn9m/9 dmvHsfPzbagL/dA+s8RmVJ9FCXIrnz8= Received: from mail-wm1-f71.google.com (mail-wm1-f71.google.com [209.85.128.71]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-203-8Fljsn5TO_OaAKNjD-yH-g-1; Mon, 03 Mar 2025 11:30:22 -0500 X-MC-Unique: 8Fljsn5TO_OaAKNjD-yH-g-1 X-Mimecast-MFC-AGG-ID: 8Fljsn5TO_OaAKNjD-yH-g_1741019422 Received: by mail-wm1-f71.google.com with SMTP id 5b1f17b1804b1-4399c5baac3so33940485e9.2 for ; Mon, 03 Mar 2025 08:30:22 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1741019421; x=1741624221; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=YXwoThNtp+x7X/3NlVobY8ZdtRlIGCn0KXkmBvKPXvw=; b=AzI0WStVO47VpU1Sq6SiYABJeTUNVKnr68PqcZcQRwK/y+Xk2KI8KtOR2k6OJdqHU3 sUElc20ayWL+mE+Ofnf2HyWXd5+nlZNO8nIYINp2/XG01v69jHozZw/+wfgYchIv2uDP O4U03atVqZJg7+DavBlW8b+YS+XTsFMJNHRg2EnPQrhb95fQQot6A+dN8gSBL7NAEoEg 3KbceUgd3ht27HEo2011FWICsSWkstSGb+UViamfXnk6+c801HLEAzWqehTF+IPP6SdA w6BydzeIocgU1+6Ptcbme5Z3klxt4pkpeuK6oQ3/qjW5UocetNrti+DfmFZwkR96PXIS /DlA== X-Gm-Message-State: AOJu0YwJeCyGsJNcHJnXvWGkKNClL5lZIhyJTWIjai1wV/K7rW7qhwel +NKt72nA3sh8sXkkqtfOyyxY6gdrFRERYxM7kIJ3US3xtfbEVYRmXHuum0/MlQETzVrkdxgbIIK wgTCC0NsjX15J0JQu+JQ0VgtP5CvEOUJTSkUKxRC+x11mVfiCVR/YwRhcBw== X-Gm-Gg: ASbGncvXiqzaaXR+Klp0OEF+dF2YwqISqBMCJugfQbX2e1uOepOwejR1oPxcD8YHSgf +vGLsVXnAyjOuwI6brYHVMbPnLTGAyKArfrx0ilJ/DuHCjDUgXjYnEi7r8k/a2Wr6srGGKb9k9D viiACdf7rsVZJcyOZny8EdYvzPS2zPsLPVVOd8hBCO9ApXDWkCo4/z0h7vn+B35lXKsKaJPnMqZ n+fugYeE5nRLTQ+RFtnuSIvOIkygHxzx1VMHvtAzjE0PRuzZJyHiRJ1YvUdFx0w2C1WoQ5Eo8rt oN4aQNy8lYCfWLyojybtfh23CbHh+kRARo+tvbUfsOdsTDv6zX2Vc5P4g13i6tnagnnFASAtJm8 H X-Received: by 2002:a05:600c:5102:b0:43b:c0fa:f9eb with SMTP id 5b1f17b1804b1-43bc0faff85mr39510565e9.17.1741019421478; Mon, 03 Mar 2025 08:30:21 -0800 (PST) X-Google-Smtp-Source: AGHT+IHuptMXo5vgbefj6sa5a5v3hHufhVKK5lbtZ5OlCKuge8xCX7GzdoorXNmVUyzEzt6+EvCK+w== X-Received: by 2002:a05:600c:5102:b0:43b:c0fa:f9eb with SMTP id 5b1f17b1804b1-43bc0faff85mr39510065e9.17.1741019421019; Mon, 03 Mar 2025 08:30:21 -0800 (PST) Received: from localhost (p200300cbc7349600af274326a2162bfb.dip0.t-ipconnect.de. [2003:cb:c734:9600:af27:4326:a216:2bfb]) by smtp.gmail.com with UTF8SMTPSA id 5b1f17b1804b1-43aba58720esm198718765e9.40.2025.03.03.08.30.19 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 03 Mar 2025 08:30:20 -0800 (PST) From: David Hildenbrand To: linux-kernel@vger.kernel.org Cc: linux-doc@vger.kernel.org, cgroups@vger.kernel.org, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, linux-api@vger.kernel.org, David Hildenbrand , Andrew Morton , "Matthew Wilcox (Oracle)" , Tejun Heo , Zefan Li , Johannes Weiner , =?UTF-8?q?Michal=20Koutn=C3=BD?= , Jonathan Corbet , Andy Lutomirski , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , Muchun Song , "Liam R. Howlett" , Lorenzo Stoakes , Vlastimil Babka , Jann Horn , "Kirill A. Shutemov" Subject: [PATCH v3 02/20] mm: factor out large folio handling from folio_nr_pages() into folio_large_nr_pages() Date: Mon, 3 Mar 2025 17:29:55 +0100 Message-ID: <20250303163014.1128035-3-david@redhat.com> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20250303163014.1128035-1-david@redhat.com> References: <20250303163014.1128035-1-david@redhat.com> Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Let's factor it out into a simple helper function. This helper will also come in handy when working with code where we know that our folio is large. While at it, let's consistently return a "long" value from all these similar functions. Note that we cannot use "unsigned int" (even though _folio_nr_pages is of that type), because it would break some callers that do stuff like "-folio_nr_pages()". Both "int" or "unsigned long" would work as well. Maybe in the future we'll have the nr_pages readily available for all large folios, maybe even for small folios, or maybe for none. Reviewed-by: Kirill A. Shutemov Signed-off-by: David Hildenbrand --- include/linux/mm.h | 28 ++++++++++++++++------------ 1 file changed, 16 insertions(+), 12 deletions(-) diff --git a/include/linux/mm.h b/include/linux/mm.h index b2903bc705997..a743321dc1a5d 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -1199,6 +1199,18 @@ static inline unsigned int folio_large_order(const struct folio *folio) return folio->_flags_1 & 0xff; } +#ifdef CONFIG_64BIT +static inline long folio_large_nr_pages(const struct folio *folio) +{ + return folio->_folio_nr_pages; +} +#else +static inline long folio_large_nr_pages(const struct folio *folio) +{ + return 1L << folio_large_order(folio); +} +#endif + /* * compound_order() can be called without holding a reference, which means * that niceties like page_folio() don't work. These callers should be @@ -2141,11 +2153,7 @@ static inline long folio_nr_pages(const struct folio *folio) { if (!folio_test_large(folio)) return 1; -#ifdef CONFIG_64BIT - return folio->_folio_nr_pages; -#else - return 1L << folio_large_order(folio); -#endif + return folio_large_nr_pages(folio); } /* Only hugetlbfs can allocate folios larger than MAX_ORDER */ @@ -2160,24 +2168,20 @@ static inline long folio_nr_pages(const struct folio *folio) * page. compound_nr() can be called on a tail page, and is defined to * return 1 in that case. */ -static inline unsigned long compound_nr(struct page *page) +static inline long compound_nr(struct page *page) { struct folio *folio = (struct folio *)page; if (!test_bit(PG_head, &folio->flags)) return 1; -#ifdef CONFIG_64BIT - return folio->_folio_nr_pages; -#else - return 1L << folio_large_order(folio); -#endif + return folio_large_nr_pages(folio); } /** * thp_nr_pages - The number of regular pages in this huge page. * @page: The head page of a huge page. */ -static inline int thp_nr_pages(struct page *page) +static inline long thp_nr_pages(struct page *page) { return folio_nr_pages((struct folio *)page); } -- 2.48.1