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 lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 3E2F4C54E58 for ; Thu, 21 Mar 2024 22:12:00 +0000 (UTC) Authentication-Results: lists.ozlabs.org; dkim=fail reason="signature verification failed" (1024-bit key; unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256 header.s=mimecast20190719 header.b=e17x3FP9; dkim=fail reason="signature verification failed" (1024-bit key) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256 header.s=mimecast20190719 header.b=QytQ8QyA; dkim-atps=neutral Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4V10726Qmzz3vc7 for ; Fri, 22 Mar 2024 09:11:58 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256 header.s=mimecast20190719 header.b=e17x3FP9; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256 header.s=mimecast20190719 header.b=QytQ8QyA; dkim-atps=neutral Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=redhat.com (client-ip=170.10.129.124; helo=us-smtp-delivery-124.mimecast.com; envelope-from=peterx@redhat.com; receiver=lists.ozlabs.org) Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (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 lists.ozlabs.org (Postfix) with ESMTPS id 4V102p505dz3cPR for ; Fri, 22 Mar 2024 09:08:18 +1100 (AEDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1711058895; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=TwZ/C3Y+mq5srgVBOLaWiB530mwVuOVA1xifIUFcqIU=; b=e17x3FP9D4AjpkF8LFJ+st+8sb6zzeFymsTgfF4db2f4ry3muxxWuknm8+wrrmMpFWEjwc HSdUhHJaTeTr+cTELps/QGqfmuIll7HbwOdaGjwT+HSDIOoG8ngfht6+S9h83subskWafc cV5cIQbZlH0LSX8BbREmBn7uumvjWtI= DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1711058896; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=TwZ/C3Y+mq5srgVBOLaWiB530mwVuOVA1xifIUFcqIU=; b=QytQ8QyAc6bjUv5kyhoB17zhdGCeZVoaK2zeyFhUVwPstKNyinnW+m8IRENNNb2FwUcCZa jAM2EuCy2WN+/SyLA2HXlLcEptVNWbZgwQb+ptc4szLESi1vwWGaXN2nYxpP2nQnEhIteb 5gWeYXZWZFFD5g7hVJaGjWzq/frlLzw= Received: from mail-qt1-f199.google.com (mail-qt1-f199.google.com [209.85.160.199]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-147-CGthgKViNeG1eoZzulKs0w-1; Thu, 21 Mar 2024 18:08:13 -0400 X-MC-Unique: CGthgKViNeG1eoZzulKs0w-1 Received: by mail-qt1-f199.google.com with SMTP id d75a77b69052e-430b4572a97so4829251cf.1 for ; Thu, 21 Mar 2024 15:08:13 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1711058893; x=1711663693; 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=TwZ/C3Y+mq5srgVBOLaWiB530mwVuOVA1xifIUFcqIU=; b=Y88V7kVRvac0OsRgQmuHGLDjbJMqltyqpHPR/+XYYLRErNpSkJKNRVZkQVcZCwOcZp pR4BbnY/9yBomK4lPE6gkzbYISvEGeYJNfFb/qnTjcVYCe//U9l7zG8wWy/KtwDSpQPK s62KJ5YPcsH28u+zTVivzu+d/XSE2u0h7J6NGmE4HxYcC9CzONJmdGKWNJZwHlhUllwT SxZCjP58j6zopFoorymK5Dw3CtJe01i5irpNQWxQBSYu88oRCRzvKKhjldV2AlgCrv0R dshYjhx3Vy+roWuN0LdLy6rjQUlGj23DB06SYuMYJcrq1NUn2MlvDiTuJ8mzr/MrTASd Zwxg== X-Gm-Message-State: AOJu0YwI4NvR48UXI+Vs9GFLz2/bkzgomfSPtOvkPRc097iRUbcOi2Ua mhd/jkKDSApVDau07Yb0hYIFBwF4PsY46CEYNftEAOu8O6RzIqO+GbRyLAILFuw5xbKUBAi3ziM 0T3JhqIEC72ol6xEguwSfCbwomnlI4HzL2ArMTq292et6xNng2PiUuYdij2aIbV8= X-Received: by 2002:a05:6214:3f89:b0:690:c35c:7590 with SMTP id ow9-20020a0562143f8900b00690c35c7590mr218153qvb.2.1711058893177; Thu, 21 Mar 2024 15:08:13 -0700 (PDT) X-Google-Smtp-Source: AGHT+IGl1Qmf0wBzWRoAAACR5bZA/I9hFYAFMFu/sm/LF6+WMAng7TWyPkikdWZMgBZCHnmtXnvmwg== X-Received: by 2002:a05:6214:3f89:b0:690:c35c:7590 with SMTP id ow9-20020a0562143f8900b00690c35c7590mr218110qvb.2.1711058892727; Thu, 21 Mar 2024 15:08:12 -0700 (PDT) Received: from x1n.redhat.com ([99.254.121.117]) by smtp.gmail.com with ESMTPSA id o6-20020a0562140e4600b00690baf5cde9sm351663qvc.118.2024.03.21.15.08.11 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 21 Mar 2024 15:08:12 -0700 (PDT) From: peterx@redhat.com To: linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [PATCH v3 04/12] mm: Introduce vma_pgtable_walk_{begin|end}() Date: Thu, 21 Mar 2024 18:07:54 -0400 Message-ID: <20240321220802.679544-5-peterx@redhat.com> X-Mailer: git-send-email 2.44.0 In-Reply-To: <20240321220802.679544-1-peterx@redhat.com> References: <20240321220802.679544-1-peterx@redhat.com> MIME-Version: 1.0 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset="US-ASCII"; x-default=true X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: James Houghton , David Hildenbrand , Yang Shi , peterx@redhat.com, Andrew Jones , linux-riscv@lists.infradead.org, Andrea Arcangeli , "Aneesh Kumar K . V" , Matthew Wilcox , Christoph Hellwig , linux-arm-kernel@lists.infradead.org, Jason Gunthorpe , Axel Rasmussen , Rik van Riel , John Hubbard , "Kirill A . Shutemov" , Vlastimil Babka , Lorenzo Stoakes , Muchun Song , Andrew Morton , linuxppc-dev@lists.ozlabs.org, Mike Rapoport , Mike Kravetz Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" From: Peter Xu Introduce per-vma begin()/end() helpers for pgtable walks. This is a preparation work to merge hugetlb pgtable walkers with generic mm. The helpers need to be called before and after a pgtable walk, will start to be needed if the pgtable walker code supports hugetlb pages. It's a hook point for any type of VMA, but for now only hugetlb uses it to stablize the pgtable pages from getting away (due to possible pmd unsharing). Reviewed-by: Christoph Hellwig Reviewed-by: Muchun Song Signed-off-by: Peter Xu --- include/linux/mm.h | 3 +++ mm/memory.c | 12 ++++++++++++ 2 files changed, 15 insertions(+) diff --git a/include/linux/mm.h b/include/linux/mm.h index 8147b1302413..d10eb89f4096 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -4198,4 +4198,7 @@ static inline bool pfn_is_unaccepted_memory(unsigned long pfn) return range_contains_unaccepted_memory(paddr, paddr + PAGE_SIZE); } +void vma_pgtable_walk_begin(struct vm_area_struct *vma); +void vma_pgtable_walk_end(struct vm_area_struct *vma); + #endif /* _LINUX_MM_H */ diff --git a/mm/memory.c b/mm/memory.c index 9bce1fa76dd7..4f2caf1c3c4d 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -6438,3 +6438,15 @@ void ptlock_free(struct ptdesc *ptdesc) kmem_cache_free(page_ptl_cachep, ptdesc->ptl); } #endif + +void vma_pgtable_walk_begin(struct vm_area_struct *vma) +{ + if (is_vm_hugetlb_page(vma)) + hugetlb_vma_lock_read(vma); +} + +void vma_pgtable_walk_end(struct vm_area_struct *vma) +{ + if (is_vm_hugetlb_page(vma)) + hugetlb_vma_unlock_read(vma); +} -- 2.44.0