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 A9FDA106F2F3 for ; Thu, 26 Mar 2026 08:09:27 +0000 (UTC) Received: from boromir.ozlabs.org (localhost [127.0.0.1]) by lists.ozlabs.org (Postfix) with ESMTP id 4fhGd30bJkz2yv1; Thu, 26 Mar 2026 19:08:55 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; arc=none smtp.remote-ip="2607:f8b0:4864:20::1349" ARC-Seal: i=1; a=rsa-sha256; d=lists.ozlabs.org; s=201707; t=1774512535; cv=none; b=kvd4++9OlI/vsPPk25kQK+KGSbzkXFrKxEltrdbEc/u+w6Ex4SH+k1TJqR/3fi3fty8wuQ16zJQ/xaUAQakW/YLgJz3a4ELVgOwE3/hjNXVYv5u9u+9B16zaCWnfF8RGw890P+tMMzcX2SFMW7ggxdjfTaKeCvJmsN2vkmajCKlyxxPWRQzau/OmMW2w9Yu43E6RNd9NFsAvpnb7jwfTYFpmSXSH/EV4Az7UbBg220YFukyAyw7JjyQYS83qILZp4MBLDndI3WQ3Rlm/6Mrfh9eMv0b4H7U9V8t6MNz8zY1CgwrJEHGIYpVemWl/UFgNc+HqU6RxZQ1GLTyK++MRjQ== ARC-Message-Signature: i=1; a=rsa-sha256; d=lists.ozlabs.org; s=201707; t=1774512535; c=relaxed/relaxed; bh=A2FZ0j4JsuEtXH0QE0EGuqUW1/fY5oq45gPlzlHIXGA=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=EX02jgiFDn6SNljDdR49jvNgoOvws6GiE/XZ3GFIMMMIoQ4I+fRYV6kFpd8qYOG3sYfrbsUpt7xiLn5jb6kFuhXWT7EB/qEvstgHjxTt3pjzelHMmahRYfXphDdWTS1XkU4NzRT/RLO4WZTZyfHkvwOU5cpsLvTmVANcdpo8CBbkYYouERIncpSCQ+ABVFY1CnM+2fWmMnzKFGoafm4XNDGvBvh/tL1vkqP9XMEdUkUfapNN0c0DEejTbABUOM2VPhaKUAL7jtPBmjRuu1ExaZdZyOf4kxo8YvCv6WllNiTlwJwTw6ecTpId+8rV/WqiFxMJhqKnTXlvn8qBwX/tkQ== ARC-Authentication-Results: i=1; lists.ozlabs.org; dmarc=pass (p=reject dis=none) header.from=google.com; dkim=pass (2048-bit key; unprotected) header.d=google.com header.i=@google.com header.a=rsa-sha256 header.s=20251104 header.b=weKux7oI; dkim-atps=neutral; spf=pass (client-ip=2607:f8b0:4864:20::1349; helo=mail-dy1-x1349.google.com; envelope-from=3k-neaqykdm4ceby7v08805y.w86527eh99w-xyf52cdc.8j5uvc.8b0@flex--surenb.bounces.google.com; receiver=lists.ozlabs.org) smtp.mailfrom=flex--surenb.bounces.google.com Authentication-Results: lists.ozlabs.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=google.com header.i=@google.com header.a=rsa-sha256 header.s=20251104 header.b=weKux7oI; dkim-atps=neutral Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=flex--surenb.bounces.google.com (client-ip=2607:f8b0:4864:20::1349; helo=mail-dy1-x1349.google.com; envelope-from=3k-neaqykdm4ceby7v08805y.w86527eh99w-xyf52cdc.8j5uvc.8b0@flex--surenb.bounces.google.com; receiver=lists.ozlabs.org) Received: from mail-dy1-x1349.google.com (mail-dy1-x1349.google.com [IPv6:2607:f8b0:4864:20::1349]) (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 4fhGd22yN3z2yrb for ; Thu, 26 Mar 2026 19:08:54 +1100 (AEDT) Received: by mail-dy1-x1349.google.com with SMTP id 5a478bee46e88-2c16233ee11so726346eec.1 for ; Thu, 26 Mar 2026 01:08:54 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1774512533; x=1775117333; darn=lists.ozlabs.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=A2FZ0j4JsuEtXH0QE0EGuqUW1/fY5oq45gPlzlHIXGA=; b=weKux7oINzBukacM8eJOJkrkMbGtCAFuIwh8OOEwbvGxFMLKK4I2zwGxcQZn0oqXuU IuuRYK2uxWyY+B3kX7l578tnq4dJCNoVeU83gAIIxKKbuSZ6Ia4PRljvEk5cj3R2j9E6 QarqxM294hFf+zioJzEAhPApqAo4oLeV6P2Uh/WbXes2LP6UelZF6YjrcCDdQJs8VhIV VgfvKQtHPs9crY1xFGx14Pi7UdxF1/iLX4Fnv3oeVX8tA4snNkR86IZ16lFOjLR2jGOL 6s36nBbjU21tO6dUlSm1wutGB7yXjNY9YbeyacM2ux36MGqKa6hm89ofwgj8z9+bEwUB aevQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1774512533; x=1775117333; 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=A2FZ0j4JsuEtXH0QE0EGuqUW1/fY5oq45gPlzlHIXGA=; b=leZarYpSKIUDnxZYcfERz0lH0GXUw+ybKcoei/L/jjqAX8/u5BUl84WXMOqU7tBp2c eXIskmOe9ZInbhfGRfu8gcsZ2MpRMURL3w1UufclqVIh56nRgacf3HB7JZf81i/qQ3xc 7jpMEnXEWQCgL5NazvOBrkEd8PmlBvfQ3O0eD4Mb6OOqBmVcCTAe22QWUpdAcXHGVBAt t6JJJ5brJt5McKh92m3iSoGHEGoc30gYyXy6jICi+gKoOB6HCM8Rf+6LUoauqj+jPzao 2XHYV5Y4Xjp+KaPMfRMsTM/mnzhTuYOntvTf6FMJoB+1lIlLL6hskXESZnny4/6O/4x6 0few== X-Forwarded-Encrypted: i=1; AJvYcCW5N91TkyhyIZPo4XNwVZJfpreb9TfmsIT0yvTUfmoF5xRAHmw+pmZDIqi4DELRyY91qrJRTXu4/j7uYew=@lists.ozlabs.org X-Gm-Message-State: AOJu0YxMZq7fAO2F6v/R7bPZU91ftt+wg41gjZlNO2SidK/depAgodit oDakBdMlgdjskjMAHDvG2s1PQJ8QaSj2DhXt78Dgr+kpvPjX+7dODW1EMSbSmJkXQZ0IGM0X7cO Xeu9C3A== X-Received: from dycrm24.prod.google.com ([2002:a05:693c:2a18:b0:2c1:4f1:c859]) (user=surenb job=prod-delivery.src-stubby-dispatcher) by 2002:a05:7300:8b05:b0:2c1:161f:ac39 with SMTP id 5a478bee46e88-2c15d3e3b8cmr3740873eec.26.1774512531898; Thu, 26 Mar 2026 01:08:51 -0700 (PDT) Date: Thu, 26 Mar 2026 01:08:35 -0700 In-Reply-To: <20260326080836.695207-1-surenb@google.com> X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list Mime-Version: 1.0 References: <20260326080836.695207-1-surenb@google.com> X-Mailer: git-send-email 2.53.0.1018.g2bb0e51243-goog Message-ID: <20260326080836.695207-6-surenb@google.com> Subject: [PATCH v5 5/6] mm: use vma_start_write_killable() in process_vma_walk_lock() From: Suren Baghdasaryan To: akpm@linux-foundation.org Cc: willy@infradead.org, david@kernel.org, ziy@nvidia.com, matthew.brost@intel.com, joshua.hahnjy@gmail.com, rakie.kim@sk.com, byungchul@sk.com, gourry@gourry.net, ying.huang@linux.alibaba.com, apopple@nvidia.com, lorenzo.stoakes@oracle.com, baolin.wang@linux.alibaba.com, Liam.Howlett@oracle.com, npache@redhat.com, ryan.roberts@arm.com, dev.jain@arm.com, baohua@kernel.org, lance.yang@linux.dev, vbabka@suse.cz, jannh@google.com, rppt@kernel.org, mhocko@suse.com, pfalcato@suse.de, kees@kernel.org, maddy@linux.ibm.com, npiggin@gmail.com, mpe@ellerman.id.au, chleroy@kernel.org, borntraeger@linux.ibm.com, frankja@linux.ibm.com, imbrenda@linux.ibm.com, hca@linux.ibm.com, gor@linux.ibm.com, agordeev@linux.ibm.com, svens@linux.ibm.com, gerald.schaefer@linux.ibm.com, linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org, surenb@google.com Content-Type: text/plain; charset="UTF-8" Replace vma_start_write() with vma_start_write_killable() when process_vma_walk_lock() is used with PGWALK_WRLOCK option. Adjust its direct and indirect users to check for a possible error and handle it. Ensure users handle EINTR correctly and do not ignore it. Suggested-by: Matthew Wilcox Signed-off-by: Suren Baghdasaryan --- fs/proc/task_mmu.c | 12 ++++++------ mm/mempolicy.c | 1 + mm/pagewalk.c | 22 +++++++++++++++------- 3 files changed, 22 insertions(+), 13 deletions(-) diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c index e091931d7ca1..33e5094a7842 100644 --- a/fs/proc/task_mmu.c +++ b/fs/proc/task_mmu.c @@ -1774,15 +1774,15 @@ static ssize_t clear_refs_write(struct file *file, const char __user *buf, struct vm_area_struct *vma; enum clear_refs_types type; int itype; - int rv; + int err; if (count > sizeof(buffer) - 1) count = sizeof(buffer) - 1; if (copy_from_user(buffer, buf, count)) return -EFAULT; - rv = kstrtoint(strstrip(buffer), 10, &itype); - if (rv < 0) - return rv; + err = kstrtoint(strstrip(buffer), 10, &itype); + if (err) + return err; type = (enum clear_refs_types)itype; if (type < CLEAR_REFS_ALL || type >= CLEAR_REFS_LAST) return -EINVAL; @@ -1824,7 +1824,7 @@ static ssize_t clear_refs_write(struct file *file, const char __user *buf, 0, mm, 0, -1UL); mmu_notifier_invalidate_range_start(&range); } - walk_page_range(mm, 0, -1, &clear_refs_walk_ops, &cp); + err = walk_page_range(mm, 0, -1, &clear_refs_walk_ops, &cp); if (type == CLEAR_REFS_SOFT_DIRTY) { mmu_notifier_invalidate_range_end(&range); flush_tlb_mm(mm); @@ -1837,7 +1837,7 @@ static ssize_t clear_refs_write(struct file *file, const char __user *buf, } put_task_struct(task); - return count; + return err ? : count; } const struct file_operations proc_clear_refs_operations = { diff --git a/mm/mempolicy.c b/mm/mempolicy.c index c38a90487531..336753a4b2b2 100644 --- a/mm/mempolicy.c +++ b/mm/mempolicy.c @@ -969,6 +969,7 @@ static const struct mm_walk_ops queue_pages_lock_vma_walk_ops = { * (a hugetlbfs page or a transparent huge page being counted as 1). * -EIO - a misplaced page found, when MPOL_MF_STRICT specified without MOVEs. * -EFAULT - a hole in the memory range, when MPOL_MF_DISCONTIG_OK unspecified. + * -EINTR - walk got terminated due to pending fatal signal. */ static long queue_pages_range(struct mm_struct *mm, unsigned long start, unsigned long end, diff --git a/mm/pagewalk.c b/mm/pagewalk.c index 3ae2586ff45b..eca7bc711617 100644 --- a/mm/pagewalk.c +++ b/mm/pagewalk.c @@ -443,14 +443,13 @@ static inline void process_mm_walk_lock(struct mm_struct *mm, mmap_assert_write_locked(mm); } -static inline void process_vma_walk_lock(struct vm_area_struct *vma, - enum page_walk_lock walk_lock) +static int process_vma_walk_lock(struct vm_area_struct *vma, + enum page_walk_lock walk_lock) { #ifdef CONFIG_PER_VMA_LOCK switch (walk_lock) { case PGWALK_WRLOCK: - vma_start_write(vma); - break; + return vma_start_write_killable(vma); case PGWALK_WRLOCK_VERIFY: vma_assert_write_locked(vma); break; @@ -462,6 +461,7 @@ static inline void process_vma_walk_lock(struct vm_area_struct *vma, break; } #endif + return 0; } /* @@ -505,7 +505,9 @@ int walk_page_range_mm_unsafe(struct mm_struct *mm, unsigned long start, if (ops->pte_hole) err = ops->pte_hole(start, next, -1, &walk); } else { /* inside vma */ - process_vma_walk_lock(vma, ops->walk_lock); + err = process_vma_walk_lock(vma, ops->walk_lock); + if (err) + break; walk.vma = vma; next = min(end, vma->vm_end); vma = find_vma(mm, vma->vm_end); @@ -722,6 +724,7 @@ int walk_page_range_vma_unsafe(struct vm_area_struct *vma, unsigned long start, .vma = vma, .private = private, }; + int err; if (start >= end || !walk.mm) return -EINVAL; @@ -729,7 +732,9 @@ int walk_page_range_vma_unsafe(struct vm_area_struct *vma, unsigned long start, return -EINVAL; process_mm_walk_lock(walk.mm, ops->walk_lock); - process_vma_walk_lock(vma, ops->walk_lock); + err = process_vma_walk_lock(vma, ops->walk_lock); + if (err) + return err; return __walk_page_range(start, end, &walk); } @@ -752,6 +757,7 @@ int walk_page_vma(struct vm_area_struct *vma, const struct mm_walk_ops *ops, .vma = vma, .private = private, }; + int err; if (!walk.mm) return -EINVAL; @@ -759,7 +765,9 @@ int walk_page_vma(struct vm_area_struct *vma, const struct mm_walk_ops *ops, return -EINVAL; process_mm_walk_lock(walk.mm, ops->walk_lock); - process_vma_walk_lock(vma, ops->walk_lock); + err = process_vma_walk_lock(vma, ops->walk_lock); + if (err) + return err; return __walk_page_range(vma->vm_start, vma->vm_end, &walk); } -- 2.53.0.1018.g2bb0e51243-goog