From patchwork Wed Jan 25 08:38:46 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Suren Baghdasaryan X-Patchwork-Id: 646934 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 5554DC61D9D for ; Wed, 25 Jan 2023 08:39:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233639AbjAYIjZ (ORCPT ); Wed, 25 Jan 2023 03:39:25 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43890 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235271AbjAYIjT (ORCPT ); Wed, 25 Jan 2023 03:39:19 -0500 Received: from mail-yb1-xb4a.google.com (mail-yb1-xb4a.google.com [IPv6:2607:f8b0:4864:20::b4a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 61F6B4DE1A for ; Wed, 25 Jan 2023 00:38:59 -0800 (PST) Received: by mail-yb1-xb4a.google.com with SMTP id a4-20020a5b0004000000b006fdc6aaec4fso19369564ybp.20 for ; Wed, 25 Jan 2023 00:38:59 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=ralp0YsbeintaJ1+3rV0BJxcsbdnu/jVKuNhvnt0T5Y=; b=FpW3ZfeoZ58NaZWfySIfB+f4+MM7GrKuq9uCXe+gfhjrC0bvKaL2kAypJ/pJdIrezU Ru0cU0KNklRfuYrJ3SKXkdPgNjMfodaxcsFUMH2z2VP+LqiGmmBZi4WNjYcaaYQLe2mC v6uAPWcErh2g6vXcpQB3pwh9XmkkPfWLDi2bI5mgZlrfFBGfjeQ9Wv8iIQeddGuuYJGy vGYSJIu//+24XGZjzB+Q3VYOxZ5pJZ/HCGoJ5h7l6e1K0sxINKIjiYRXApyFQ3GXR7xJ ZclVjCWVjm/7Pu3pZxJbkPLxrnDwpix1sMzuU+AEqB9vICm+UZCWtOUOt5GLju8+nccL rTTw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=ralp0YsbeintaJ1+3rV0BJxcsbdnu/jVKuNhvnt0T5Y=; b=UrmIpk5a3GDZeVgIC38hMiakHYR0mNPo8g0E+ALnMp3ANKeCY6ckWuf+cLDC4A3XLG 0Bm0c5Fd1vnkC+ruaISiICtXUvtnLnbR70E68QMcUSePZ9zc4uQp8JQD4vhqGFt9E4EA i9fyDmgoveugU3J5OJHf9Y0iLv3n/fTK0GHexXVTeCWOXasBlRZzFtz+hsY1Eto735Uy i8PfEYDj/jMVeBUKwj/SIIn3JbdLwMQ9qAoyIhhKo9zpgmxEHFop6voHOoQfKl3DmT6c mAllwS8emDT3cp5qlQlxoBeaJaSz+ql5VdDpIrdG7sv+fILLUmz/yJWU5OL41iABSwzu D/uA== X-Gm-Message-State: AO0yUKVPrD7C1E23wWEb9JblLhMyD6ehVESDhu1spc0yHsQjDB26tGYl lAZCzV9DXRqwGvb+mpeGH9TUlDzu9Ys= X-Google-Smtp-Source: AK7set8/stQqnGGz4OB/vqyDOBLoBX54VTTeagu3mMK0HzymWEEvjI0ujOzPLr/zvAsu1DJMDE0YK80W9/s= X-Received: from surenb-desktop.mtv.corp.google.com ([2620:15c:211:200:f7b0:20e8:ce66:f98]) (user=surenb job=sendgmr) by 2002:a81:3e07:0:b0:506:6185:4fad with SMTP id l7-20020a813e07000000b0050661854fadmr450398ywa.451.1674635938431; Wed, 25 Jan 2023 00:38:58 -0800 (PST) Date: Wed, 25 Jan 2023 00:38:46 -0800 In-Reply-To: <20230125083851.27759-1-surenb@google.com> Mime-Version: 1.0 References: <20230125083851.27759-1-surenb@google.com> X-Mailer: git-send-email 2.39.1.405.gd4c25cc71f-goog Message-ID: <20230125083851.27759-2-surenb@google.com> Subject: [PATCH v2 1/6] mm: introduce vma->vm_flags modifier functions From: Suren Baghdasaryan To: akpm@linux-foundation.org Cc: michel@lespinasse.org, jglisse@google.com, mhocko@suse.com, vbabka@suse.cz, hannes@cmpxchg.org, mgorman@techsingularity.net, dave@stgolabs.net, willy@infradead.org, liam.howlett@oracle.com, peterz@infradead.org, ldufour@linux.ibm.com, paulmck@kernel.org, luto@kernel.org, songliubraving@fb.com, peterx@redhat.com, david@redhat.com, dhowells@redhat.com, hughd@google.com, bigeasy@linutronix.de, kent.overstreet@linux.dev, punit.agrawal@bytedance.com, lstoakes@gmail.com, peterjung1337@gmail.com, rientjes@google.com, axelrasmussen@google.com, joelaf@google.com, minchan@google.com, jannh@google.com, shakeelb@google.com, tatashin@google.com, edumazet@google.com, gthelen@google.com, gurua@google.com, arjunroy@google.com, soheil@google.com, hughlynch@google.com, leewalsh@google.com, posk@google.com, will@kernel.org, aneesh.kumar@linux.ibm.com, npiggin@gmail.com, chenhuacai@kernel.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, richard@nod.at, anton.ivanov@cambridgegreys.com, johannes@sipsolutions.net, qianweili@huawei.com, wangzhou1@hisilicon.com, herbert@gondor.apana.org.au, davem@davemloft.net, vkoul@kernel.org, airlied@gmail.com, daniel@ffwll.ch, maarten.lankhorst@linux.intel.com, mripard@kernel.org, tzimmermann@suse.de, l.stach@pengutronix.de, krzysztof.kozlowski@linaro.org, patrik.r.jakobsson@gmail.com, matthias.bgg@gmail.com, robdclark@gmail.com, quic_abhinavk@quicinc.com, dmitry.baryshkov@linaro.org, tomba@kernel.org, hjc@rock-chips.com, heiko@sntech.de, ray.huang@amd.com, kraxel@redhat.com, sre@kernel.org, mcoquelin.stm32@gmail.com, alexandre.torgue@foss.st.com, tfiga@chromium.org, m.szyprowski@samsung.com, mchehab@kernel.org, dimitri.sivanich@hpe.com, zhangfei.gao@linaro.org, jejb@linux.ibm.com, martin.petersen@oracle.com, dgilbert@interlog.com, hdegoede@redhat.com, mst@redhat.com, jasowang@redhat.com, alex.williamson@redhat.com, deller@gmx.de, jayalk@intworks.biz, viro@zeniv.linux.org.uk, nico@fluxnic.net, xiang@kernel.org, chao@kernel.org, tytso@mit.edu, adilger.kernel@dilger.ca, miklos@szeredi.hu, mike.kravetz@oracle.com, muchun.song@linux.dev, bhe@redhat.com, andrii@kernel.org, yoshfuji@linux-ipv6.org, dsahern@kernel.org, kuba@kernel.org, pabeni@redhat.com, perex@perex.cz, tiwai@suse.com, haojian.zhuang@gmail.com, robert.jarzmik@free.fr, linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, x86@kernel.org, linux-kernel@vger.kernel.org, linux-graphics-maintainer@vmware.com, linux-ia64@vger.kernel.org, linux-arch@vger.kernel.org, loongarch@lists.linux.dev, kvm@vger.kernel.org, linux-s390@vger.kernel.org, linux-sgx@vger.kernel.org, linux-um@lists.infradead.org, linux-acpi@vger.kernel.org, linux-crypto@vger.kernel.org, nvdimm@lists.linux.dev, dmaengine@vger.kernel.org, amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, etnaviv@lists.freedesktop.org, linux-samsung-soc@vger.kernel.org, intel-gfx@lists.freedesktop.org, linux-mediatek@lists.infradead.org, linux-arm-msm@vger.kernel.org, freedreno@lists.freedesktop.org, linux-rockchip@lists.infradead.org, linux-tegra@vger.kernel.org, virtualization@lists.linux-foundation.org, xen-devel@lists.xenproject.org, linux-stm32@st-md-mailman.stormreply.com, linux-rdma@vger.kernel.org, linux-media@vger.kernel.org, linux-accelerators@lists.ozlabs.org, sparclinux@vger.kernel.org, linux-scsi@vger.kernel.org, linux-staging@lists.linux.dev, target-devel@vger.kernel.org, linux-usb@vger.kernel.org, netdev@vger.kernel.org, linux-fbdev@vger.kernel.org, linux-aio@kvack.org, linux-fsdevel@vger.kernel.org, linux-erofs@lists.ozlabs.org, linux-ext4@vger.kernel.org, devel@lists.orangefs.org, kexec@lists.infradead.org, linux-xfs@vger.kernel.org, bpf@vger.kernel.org, linux-perf-users@vger.kernel.org, kasan-dev@googlegroups.com, selinux@vger.kernel.org, alsa-devel@alsa-project.org, kernel-team@android.com, surenb@google.com Precedence: bulk List-ID: X-Mailing-List: linux-samsung-soc@vger.kernel.org vm_flags are among VMA attributes which affect decisions like VMA merging and splitting. Therefore all vm_flags modifications are performed after taking exclusive mmap_lock to prevent vm_flags updates racing with such operations. Introduce modifier functions for vm_flags to be used whenever flags are updated. This way we can better check and control correct locking behavior during these updates. Signed-off-by: Suren Baghdasaryan Acked-by: Mike Rapoport (IBM) --- include/linux/mm.h | 37 +++++++++++++++++++++++++++++++++++++ include/linux/mm_types.h | 8 +++++++- 2 files changed, 44 insertions(+), 1 deletion(-) diff --git a/include/linux/mm.h b/include/linux/mm.h index c2f62bdce134..b71f2809caac 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -627,6 +627,43 @@ static inline void vma_init(struct vm_area_struct *vma, struct mm_struct *mm) INIT_LIST_HEAD(&vma->anon_vma_chain); } +/* Use when VMA is not part of the VMA tree and needs no locking */ +static inline void init_vm_flags(struct vm_area_struct *vma, + unsigned long flags) +{ + vma->vm_flags = flags; +} + +/* Use when VMA is part of the VMA tree and modifications need coordination */ +static inline void reset_vm_flags(struct vm_area_struct *vma, + unsigned long flags) +{ + mmap_assert_write_locked(vma->vm_mm); + init_vm_flags(vma, flags); +} + +static inline void set_vm_flags(struct vm_area_struct *vma, + unsigned long flags) +{ + mmap_assert_write_locked(vma->vm_mm); + vma->vm_flags |= flags; +} + +static inline void clear_vm_flags(struct vm_area_struct *vma, + unsigned long flags) +{ + mmap_assert_write_locked(vma->vm_mm); + vma->vm_flags &= ~flags; +} + +static inline void mod_vm_flags(struct vm_area_struct *vma, + unsigned long set, unsigned long clear) +{ + mmap_assert_write_locked(vma->vm_mm); + vma->vm_flags |= set; + vma->vm_flags &= ~clear; +} + static inline void vma_set_anonymous(struct vm_area_struct *vma) { vma->vm_ops = NULL; diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h index 2d6d790d9bed..6c7c70bf50dd 100644 --- a/include/linux/mm_types.h +++ b/include/linux/mm_types.h @@ -491,7 +491,13 @@ struct vm_area_struct { * See vmf_insert_mixed_prot() for discussion. */ pgprot_t vm_page_prot; - unsigned long vm_flags; /* Flags, see mm.h. */ + + /* + * Flags, see mm.h. + * WARNING! Do not modify directly. + * Use {init|reset|set|clear|mod}_vm_flags() functions instead. + */ + unsigned long vm_flags; /* * For areas with an address space and backing store,