From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (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 D127C250C14 for ; Mon, 3 Mar 2025 16:30:56 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741019459; cv=none; b=QbEaqrCOAPB/Ppp5yRma5DGHvOulvHsRAPLgMxsP8h6MhZvDyvvVIi6CVH0RtJzD+3dE6XTM+5B8/TePtlPa7Z+t+hKBe3b0B8kzGjZeEl6HY8c0KtoLaHEzzT4O0lzti+ji3yjHD5jdOZmswfkFTz8d+dWGdBTWIvTHudVcn4w= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741019459; c=relaxed/simple; bh=RlWl3fpiF9O9sdm/iMb9TRR2Zh30yDuqbmqk7QeHHkM=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=NZacg2RXerq4vwbouvquu6vd255pFLiGrhtxiXsWrrTLB2672WvM7gwR4kDpdkoIqBmCvfzb6BVt1e8ThV3cG+9NgIwrMuthBbavvjS8kWHHwOlMMmq9BuEcQ2W0skpY3VFT+mhXvrBNLoEpiF1aIajWRQN6bK0w98wz5OX4yHg= 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=BwVrRVZ1; arc=none smtp.client-ip=170.10.133.124 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="BwVrRVZ1" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1741019455; 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=TqnqolcXMjdbgOoHxDkquZtgq0jreZJuwmbRkc4obqU=; b=BwVrRVZ1xC7xAbCQbZ/P+KzhM0UE/DuKdYIYV3rffin7N803Gs/6dAvicXFnSkAatqtz15 WXKhaKHXfYATVEdFLMmCmdZtIvhuTEqUm1vkKh0Xg4t9UN4PxBFlhOxdn1M9oqcOqeKTu1 b1Uy/gRZQRjeYc+6pTZIHNk3FGh4Zoc= Received: from mail-wr1-f69.google.com (mail-wr1-f69.google.com [209.85.221.69]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-632-lwzRZ5dHNMqBFA_Zc_EuKg-1; Mon, 03 Mar 2025 11:30:44 -0500 X-MC-Unique: lwzRZ5dHNMqBFA_Zc_EuKg-1 X-Mimecast-MFC-AGG-ID: lwzRZ5dHNMqBFA_Zc_EuKg_1741019444 Received: by mail-wr1-f69.google.com with SMTP id ffacd0b85a97d-390e271517fso2720797f8f.1 for ; Mon, 03 Mar 2025 08:30:44 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1741019443; x=1741624243; 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=TqnqolcXMjdbgOoHxDkquZtgq0jreZJuwmbRkc4obqU=; b=njeR5os5u49/p2lHKHxxNGl6bduzKFAJf2qnKF8P/Hf4vJT4P5zWQjV0tD6XCMpbsU cLb59ltRp2MdEPamdePuHHt5KBM5Q8s2nYyyLHDG/98mwNEnTm9Y5lBDqHJajePhN1jN 5NAeWXFt6LaDROXKIAp69V7A0XX97FP3Ev8XBS6ZiZKKskBQAZeID62MVqkIU48QbWdV 5XJzzbERzZx/OaiHpwzLElldcTGed/1nioqYIojxPrzIXghrIZtQQDoYLIKwnqOQQYRY zWCa2xmOIt9bBqPi2ZBXneWmK1iMZp1mGA3TEKGFCOx+F39TQmqSYnRnTdvPTAX76d00 wDig== X-Gm-Message-State: AOJu0Yzg4rJpRGVRTNxrfXzKQlYOGJUiOQrxzGK56NrJi1AFFQE7ez1y K9FSgMmZ7wxfJ+DLLiwmxWdIIWF/0xl7HqOpya/Ep9tWBnMTvimrKluU5cplVkAKbEw010KBkcs zjZdV6ecEYQEK/T/tjCEWsd9bXiDhXUX53oZetzJgmlDQLP182V1C3RP/+Q== X-Gm-Gg: ASbGncsUyyqZxzTkCmmvx3MU+hQ0gjvpKj1Ky08Ze7y2q3XPVdfs2/odmS5f0ArvdfQ OOzRUlatOqiPmZ0WP75kYo+iLtuz+0TveNzMJdU/d26i4Nb1r/aA9SlC1iB+Tpnj8t0Gn7mJz2O DPFlucdZwGTOncYd2GS+WmF2UndXtOCNCQOgXkOr51c63t/STcUrWX+rMpK+NuiOiO6QH8TqeAz Br3GTjeLv6et+Ja30zEwtrE235HKS37S7I0mIYNyDjQYwfOvAF5/XnAeX1wDcLsHg3oL6XvhSHj nf6vtP0ijWxRnVh2parMPRu1c3LRgDvuuajPBSR4QMcpwb7F3mhI70L80lU4yrx9QluL7g3BgTP V X-Received: by 2002:a05:6000:1fa3:b0:390:f400:2083 with SMTP id ffacd0b85a97d-390f400227cmr11383322f8f.0.1741019443607; Mon, 03 Mar 2025 08:30:43 -0800 (PST) X-Google-Smtp-Source: AGHT+IGnhjPORrAR9y+RvgL1OaYsuXRTyHneFQKcSCvW+9sKqMuJZykkJsayBSNel9nRS5Z27sSgaA== X-Received: by 2002:a05:6000:1fa3:b0:390:f400:2083 with SMTP id ffacd0b85a97d-390f400227cmr11383264f8f.0.1741019443130; Mon, 03 Mar 2025 08:30:43 -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 5b1f17b1804b1-43bc032d049sm46650855e9.5.2025.03.03.08.30.41 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 03 Mar 2025 08:30:42 -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 11/20] mm/rmap: use folio_large_nr_pages() in add/remove functions Date: Mon, 3 Mar 2025 17:30:04 +0100 Message-ID: <20250303163014.1128035-12-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 just use the "large" variant in code where we are sure that we have a large folio in our hands: this way we are sure that we don't perform any unnecessary "large" checks. While at it, convert the VM_BUG_ON_VMA to a VM_WARN_ON_ONCE. Maybe in the future there will not be a difference in that regard between large and small folios; in that case, unifying the handling again will be easy. E.g., folio_large_nr_pages() will simply translate to folio_nr_pages() until we replace all instances. Reviewed-by: Kirill A. Shutemov Signed-off-by: David Hildenbrand --- mm/rmap.c | 14 ++++++++------ 1 file changed, 8 insertions(+), 6 deletions(-) diff --git a/mm/rmap.c b/mm/rmap.c index 08846b7eced60..c9922928616ee 100644 --- a/mm/rmap.c +++ b/mm/rmap.c @@ -1274,7 +1274,7 @@ static __always_inline unsigned int __folio_add_rmap(struct folio *folio, if (first) { nr = atomic_add_return_relaxed(ENTIRELY_MAPPED, mapped); if (likely(nr < ENTIRELY_MAPPED + ENTIRELY_MAPPED)) { - nr_pages = folio_nr_pages(folio); + nr_pages = folio_large_nr_pages(folio); /* * We only track PMD mappings of PMD-sized * folios separately. @@ -1522,14 +1522,11 @@ void folio_add_anon_rmap_pmd(struct folio *folio, struct page *page, void folio_add_new_anon_rmap(struct folio *folio, struct vm_area_struct *vma, unsigned long address, rmap_t flags) { - const int nr = folio_nr_pages(folio); const bool exclusive = flags & RMAP_EXCLUSIVE; - int nr_pmdmapped = 0; + int nr = 1, nr_pmdmapped = 0; VM_WARN_ON_FOLIO(folio_test_hugetlb(folio), folio); VM_WARN_ON_FOLIO(!exclusive && !folio_test_locked(folio), folio); - VM_BUG_ON_VMA(address < vma->vm_start || - address + (nr << PAGE_SHIFT) > vma->vm_end, vma); /* * VM_DROPPABLE mappings don't swap; instead they're just dropped when @@ -1547,6 +1544,7 @@ void folio_add_new_anon_rmap(struct folio *folio, struct vm_area_struct *vma, } else if (!folio_test_pmd_mappable(folio)) { int i; + nr = folio_large_nr_pages(folio); for (i = 0; i < nr; i++) { struct page *page = folio_page(folio, i); @@ -1559,6 +1557,7 @@ void folio_add_new_anon_rmap(struct folio *folio, struct vm_area_struct *vma, folio_set_large_mapcount(folio, nr, vma); atomic_set(&folio->_nr_pages_mapped, nr); } else { + nr = folio_large_nr_pages(folio); /* increment count (starts at -1) */ atomic_set(&folio->_entire_mapcount, 0); folio_set_large_mapcount(folio, 1, vma); @@ -1568,6 +1567,9 @@ void folio_add_new_anon_rmap(struct folio *folio, struct vm_area_struct *vma, nr_pmdmapped = nr; } + VM_WARN_ON_ONCE(address < vma->vm_start || + address + (nr << PAGE_SHIFT) > vma->vm_end); + __folio_mod_stat(folio, nr, nr_pmdmapped); mod_mthp_stat(folio_order(folio), MTHP_STAT_NR_ANON, 1); } @@ -1681,7 +1683,7 @@ static __always_inline void __folio_remove_rmap(struct folio *folio, if (last) { nr = atomic_sub_return_relaxed(ENTIRELY_MAPPED, mapped); if (likely(nr < ENTIRELY_MAPPED)) { - nr_pages = folio_nr_pages(folio); + nr_pages = folio_large_nr_pages(folio); if (level == RMAP_LEVEL_PMD) nr_pmdmapped = nr_pages; nr = nr_pages - (nr & FOLIO_PAGES_MAPPED); -- 2.48.1