From nobody Mon Dec 29 00:36:52 2025 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4829AC4167B for ; Mon, 4 Dec 2023 14:27:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235778AbjLDO11 (ORCPT ); Mon, 4 Dec 2023 09:27:27 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52664 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235870AbjLDO1M (ORCPT ); Mon, 4 Dec 2023 09:27:12 -0500 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 98BCF421B for ; Mon, 4 Dec 2023 06:24:31 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1701699870; 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=Py+BBg1WdhAyTKIO2vh7V9agn/F6NhuWPF4QbRDWhlI=; b=RTyBlxDRCWlMK4SwNUAeSqgEuKK55AXYyopeywo76uOJVUo6dt68wd3O3b5rDhF5JMDyaW crC92wC/EVAd/qCvlZxw2J9rCLI9tKCEMH9Na2wz7P0/IscxlUIB+sAP2iPmkzxryCRKD9 fpdR7TQGWjO4ZwdVPr3oOe8IS8iL9BM= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-110-KmE7Bv2xNWyBuu4ga5J7Uw-1; Mon, 04 Dec 2023 09:24:16 -0500 X-MC-Unique: KmE7Bv2xNWyBuu4ga5J7Uw-1 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.rdu2.redhat.com [10.11.54.4]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id CCFA88F9205; Mon, 4 Dec 2023 14:21:59 +0000 (UTC) Received: from t14s.fritz.box (unknown [10.39.195.87]) by smtp.corp.redhat.com (Postfix) with ESMTP id 308C02026D68; Mon, 4 Dec 2023 14:21:58 +0000 (UTC) From: David Hildenbrand To: linux-kernel@vger.kernel.org Cc: linux-mm@kvack.org, David Hildenbrand , Andrew Morton , "Matthew Wilcox (Oracle)" , Hugh Dickins , Ryan Roberts , Yin Fengwei , Mike Kravetz , Muchun Song , Peter Xu Subject: [PATCH RFC 06/39] mm/rmap: add hugetlb sanity checks Date: Mon, 4 Dec 2023 15:21:13 +0100 Message-ID: <20231204142146.91437-7-david@redhat.com> In-Reply-To: <20231204142146.91437-1-david@redhat.com> References: <20231204142146.91437-1-david@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.4 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Let's make sure we end up with the right folios in the right functions. Signed-off-by: David Hildenbrand Reviewed-by: Yin Fengwei --- include/linux/rmap.h | 7 +++++++ mm/rmap.c | 6 ++++++ 2 files changed, 13 insertions(+) diff --git a/include/linux/rmap.h b/include/linux/rmap.h index 3f38141b53b9d..77e336f86c72d 100644 --- a/include/linux/rmap.h +++ b/include/linux/rmap.h @@ -212,6 +212,7 @@ void hugetlb_add_new_anon_rmap(struct folio *, struct v= m_area_struct *, static inline int hugetlb_try_dup_anon_rmap(struct folio *folio, struct vm_area_struct *vma) { + VM_WARN_ON_FOLIO(!folio_test_hugetlb(folio), folio); VM_WARN_ON_FOLIO(!folio_test_anon(folio), folio); =20 if (PageAnonExclusive(&folio->page)) { @@ -226,6 +227,7 @@ static inline int hugetlb_try_dup_anon_rmap(struct foli= o *folio, /* See page_try_share_anon_rmap() */ static inline int hugetlb_try_share_anon_rmap(struct folio *folio) { + VM_WARN_ON_FOLIO(!folio_test_hugetlb(folio), folio); VM_WARN_ON_FOLIO(!folio_test_anon(folio), folio); VM_WARN_ON_FOLIO(!PageAnonExclusive(&folio->page), folio); =20 @@ -245,6 +247,7 @@ static inline int hugetlb_try_share_anon_rmap(struct fo= lio *folio) =20 static inline void hugetlb_add_file_rmap(struct folio *folio) { + VM_WARN_ON_FOLIO(!folio_test_hugetlb(folio), folio); VM_WARN_ON_FOLIO(folio_test_anon(folio), folio); =20 atomic_inc(&folio->_entire_mapcount); @@ -252,11 +255,15 @@ static inline void hugetlb_add_file_rmap(struct folio= *folio) =20 static inline void hugetlb_remove_rmap(struct folio *folio) { + VM_WARN_ON_FOLIO(!folio_test_hugetlb(folio), folio); + atomic_dec(&folio->_entire_mapcount); } =20 static inline void __page_dup_rmap(struct page *page, bool compound) { + VM_WARN_ON(folio_test_hugetlb(page_folio(page))); + if (compound) { struct folio *folio =3D (struct folio *)page; =20 diff --git a/mm/rmap.c b/mm/rmap.c index 2f1af3958e687..a735ecca47a81 100644 --- a/mm/rmap.c +++ b/mm/rmap.c @@ -1313,6 +1313,7 @@ void folio_add_new_anon_rmap(struct folio *folio, str= uct vm_area_struct *vma, { int nr; =20 + VM_WARN_ON_FOLIO(folio_test_hugetlb(folio), folio); VM_BUG_ON_VMA(address < vma->vm_start || address >=3D vma->vm_end, vma); __folio_set_swapbacked(folio); =20 @@ -1353,6 +1354,7 @@ void folio_add_file_rmap_range(struct folio *folio, s= truct page *page, unsigned int nr_pmdmapped =3D 0, first; int nr =3D 0; =20 + VM_WARN_ON_FOLIO(folio_test_hugetlb(folio), folio); VM_WARN_ON_FOLIO(compound && !folio_test_pmd_mappable(folio), folio); =20 /* Is page being mapped by PTE? Is this its first map to be added? */ @@ -1438,6 +1440,7 @@ void page_remove_rmap(struct page *page, struct vm_ar= ea_struct *vma, bool last; enum node_stat_item idx; =20 + VM_WARN_ON_FOLIO(folio_test_hugetlb(folio), folio); VM_BUG_ON_PAGE(compound && !PageHead(page), page); =20 /* Is page being unmapped by PTE? Is this its last map to be removed? */ @@ -2590,6 +2593,7 @@ void rmap_walk_locked(struct folio *folio, struct rma= p_walk_control *rwc) void hugetlb_add_anon_rmap(struct folio *folio, struct vm_area_struct *vma, unsigned long address, rmap_t flags) { + VM_WARN_ON_FOLIO(!folio_test_hugetlb(folio), folio); VM_WARN_ON_FOLIO(!folio_test_anon(folio), folio); =20 atomic_inc(&folio->_entire_mapcount); @@ -2602,6 +2606,8 @@ void hugetlb_add_anon_rmap(struct folio *folio, struc= t vm_area_struct *vma, void hugetlb_add_new_anon_rmap(struct folio *folio, struct vm_area_struct *vma, unsigned long address) { + VM_WARN_ON_FOLIO(!folio_test_hugetlb(folio), folio); + BUG_ON(address < vma->vm_start || address >=3D vma->vm_end); /* increment count (starts at -1) */ atomic_set(&folio->_entire_mapcount, 0); --=20 2.41.0