From nobody Mon Feb 9 12:01:36 2026 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 5BE81C04FE0 for ; Tue, 25 Jul 2023 14:20:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232554AbjGYOUw (ORCPT ); Tue, 25 Jul 2023 10:20:52 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33096 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231855AbjGYOUh (ORCPT ); Tue, 25 Jul 2023 10:20:37 -0400 Received: from mail-pf1-x435.google.com (mail-pf1-x435.google.com [IPv6:2607:f8b0:4864:20::435]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B98FA2680 for ; Tue, 25 Jul 2023 07:16:47 -0700 (PDT) Received: by mail-pf1-x435.google.com with SMTP id d2e1a72fcca58-6687466137bso3225697b3a.0 for ; Tue, 25 Jul 2023 07:16:47 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20221208; t=1690294573; x=1690899373; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=oFxuOTNi48idsZt2cpb80HlTb2Zev1a6Crwl3aXBH/I=; b=Vnvg+6kraoEV4R961SF/K60SkLscD6ltMXTv8foeY0JKks11+5r4lBp5ADRIJyrOGa d6n2xSvOx7v42sVgmO2CyW1JxwyEDLIUYxFU/u6LAykPSzMllz9OSI3L//5uBQazyOYr vCe6fhoGyES7upDBUZVVRCwUOzjt3V787cVK3tYVRXaVKTHb5X9DBhE+fA7x2cTnxfc2 4zscfVQYnRGlBpSkRDrLDAgcweyQv4q18QGI9NHE9wJAnCnUm5VKiGGfIW/ELbLw51GG 7zeRqRVYAQH19p4/3qTj+45e5XJS7pmB1NAopg+dGGPRH6LKSDZC2fUpsPpBulDZDDas mwZw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1690294573; x=1690899373; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=oFxuOTNi48idsZt2cpb80HlTb2Zev1a6Crwl3aXBH/I=; b=LNAEH71F9qhUO7i1s5+Zaica7Lztx4gyzENv+wr+nbENN1a2UbEETGtYIU2J1l24+k mGzpCr0qDlFnd6j5M+nIEJZQT+Wox0b92uFJO4izXCHZ2AV9maXWmTWDQTz30pc68+eb VSpqheKT9PAOWq4zuMDYC9QX2WbpofUO/7MdPVRDvwUdhvxd7xkFbpuvtQU0ai+WdT5x qgUxYVVBNQDrbSGTES+dgpvkiCk6/qKBXBvtVc0o6Joxe3ZcCOvdJpmd7gUIgz8LjqLC 6JsY3C00jm7fQt1YuLCFDAyJVSmccsp4a4sQO9ZVh5nANjXCpKY6YGWqQf9FrBqeENFo Lm6w== X-Gm-Message-State: ABy/qLYE6DbzFh9bCxWJx/qfTUkne7ZoE775+zVfb5T2fW7C4zLkWelL 21WnQ7yAug/Rp1LDAC13ufFPqWXKLlqeJ93zh0Y= X-Google-Smtp-Source: APBJJlHnwscllbyiMqyKzSni+zvMpZ7xsDOd2enSsYZDaaLi+YxRoadU3GPJJ4wXqwVYidJ2mvJSKQ== X-Received: by 2002:a05:6a20:841a:b0:135:4858:681 with SMTP id c26-20020a056a20841a00b0013548580681mr12732107pzd.9.1690294573391; Tue, 25 Jul 2023 07:16:13 -0700 (PDT) Received: from linux.. (static.111.40.78.5.clients.your-server.de. [5.78.40.111]) by smtp.gmail.com with ESMTPSA id l24-20020a62be18000000b0064f7c56d8b7sm9601482pff.219.2023.07.25.07.16.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 25 Jul 2023 07:16:12 -0700 (PDT) From: Binglei Wang X-Google-Original-From: Binglei Wang To: hch@lst.de Cc: m.szyprowski@samsung.com, robin.murphy@arm.com, iommu@lists.linux.dev, linux-kernel@vger.kernel.org, l3b2w1@gmail.com Subject: [PATCH v2] cma: check for memory region overlapping Date: Tue, 25 Jul 2023 22:16:02 +0800 Message-Id: <20230725141602.7759-1-l3b2w1@gmail.com> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: l3b2w1 Add a overlapping check in the program flow of paring dts. Check if cma area overlaps with memblock-reserved areas (kenrel code area for example)before calling=20 early_init_fdt_scan_reserved_mem. Signed-off-by: l3b2w1 --- Notes: v2: delete the logic code for handling return EBUSY. =20 v1: return EBUSY when detect overlapping and handle the return case. kernel/dma/contiguous.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/kernel/dma/contiguous.c b/kernel/dma/contiguous.c index 6ea80ae42..20ebbcefd 100644 --- a/kernel/dma/contiguous.c +++ b/kernel/dma/contiguous.c @@ -410,6 +410,11 @@ static int __init rmem_cma_setup(struct reserved_mem *= rmem) return -EBUSY; } =20 + if (memblock_is_region_reserved(rmem->base, rmem->size)) { + pr_info("Reserved memory: overlap with other memblock reserved region\n", + return -EBUSY; + } + if (!of_get_flat_dt_prop(node, "reusable", NULL) || of_get_flat_dt_prop(node, "no-map", NULL)) return -EINVAL; --=20 2.39.0