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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 C8A64C5620A for ; Thu, 6 Aug 2026 09:36:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=JoRhdZOCeEiS1VMpBUeU4kVAqK2jVYvx0TEggrSzApM=; b=t5bDN+5YhoAxeT66Vqf+oLVcqS QyasZPpBWzc7cV7PB7qOpkK+IwZOQkYL4/+uzzNQRb5ff0mp+wOSRWQs7WcnZ4qDJKKnpX0eIlKoa BQHGT9lEe2t6CqIf7zqd7WwkLQ3mrnjP68ZKKyyggiwvEZ6HZQEKajMpcrpIPM8cLdyYZnR8Ehiaj DvoUjjFX7zT6oMTi01ss/5lwrbHZKY/a0kUStWtULJX0M9ITRC4JfGA0KbZKKqQYip0rn+N93dAS3 sh9sMvwT6Jf9BpaWL9ptX5dCJPreYQ+ELnWFacqrWRyRumKMXEVLBgJ1dq5sMkm5z2iv22B6u2v0z hpPVpy3w==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wruWa-00000005Q3x-3sbA; Thu, 06 Aug 2026 09:36:28 +0000 Received: from mail-pf1-x443.google.com ([2607:f8b0:4864:20::443]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1wruWW-00000005PyH-4Ar2 for linux-arm-kernel@lists.infradead.org; Thu, 06 Aug 2026 09:36:27 +0000 Received: by mail-pf1-x443.google.com with SMTP id d2e1a72fcca58-84847482584so559665b3a.0 for ; Thu, 06 Aug 2026 02:36:24 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1786008984; x=1786613784; darn=lists.infradead.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to:content-type; bh=JoRhdZOCeEiS1VMpBUeU4kVAqK2jVYvx0TEggrSzApM=; b=jOoiRaXmpKO068h2SB529JWPNPqLGn3Mk2afl5DZpWW1o0o7195tf6jU1rfJD7J2em 7BEiv1kXyor/hbvxH3CoxBRt2zMc7oB7QTOvsTfDL/ST8msJwlizQ30nhRtUE/wichC6 f3XTEJh5B3GZKvK7STzkPuF8E3jEpoZSP2cLnG1UQ9CkkpHIQogQSoCAexMIbOi5XI71 iC7GN1WxeF7FUNxDLyLVZAgqPLm/uyrrC/0nv2AArBHsnRIlJMCwW/TvjRqAulK3xLXi wZBq0OVczeaXTtxR/aEcMuw9COF9hRKkQLRL38ArE2//VCfqxQoy4cGdYPGnhNnHlYK4 /FKw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1786008984; x=1786613784; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to:content-type; bh=JoRhdZOCeEiS1VMpBUeU4kVAqK2jVYvx0TEggrSzApM=; b=mJFREJODw2Ys+h6bpyDPhIGHMw5yE3YsYxMdoYpXsRFHdwQUBuU7EBzBroxsneLgB4 3P7m7bJ5OT4imji7PSC1JgVQOkzFzfQcxTaTacwGns6IfEKDXXUSpqw7SpPkSprt1IAb w1Q6GNP30zboXPUy+5UaniGLiuT1CM3a9qAaFLeEyA9HQPQyDQOEmTI6Exs+GEI55402 5verL8+AlaTe8pTzazBogPZQSPV1q8Vs9Ek9ehJTNViHXBhvxNi1+D/VstBWATDe7Gl7 RbuRnmy3TvzmyKAz/4DFtAN0VHmoFy39l5DcGYVQNETW+JH8y5sEnQNWsiwlvCdoTemW iREA== X-Forwarded-Encrypted: i=1; AHgh+RpCPKZxz08x/yT4EigUDp0Z2TNB5L4R+1htOO1SF0AxXiA7qdKKvAF7t5DqOqUl38h/MuZ2W6RbYF6QWuXCRLdS@lists.infradead.org X-Gm-Message-State: AOJu0YytW+dfRo+1+rTCLj3PgyQXOWZ+KPra8BXnm85EIffEyMUZyLjw gkMexHaPLobusHpJ6d3WkTBf4lEPoZjshz050hohaEFwekM7HfIQkwbR X-Gm-Gg: AR+sD13Q/rSj1Ljyx1KkGuk+uRgxJ7OquZZKF4jfcfCIPpMg6jg7oQwHU7g2ulx+Xv9 225Wi0HRcigXrG2zchO1wCpMB014iACOR/xAelnZdX3gvRmLTgseje2pyjZbvbr3OtQ9ihUDFkG Ss2GPrgnE8bxnvBfaCnZKvyJF8KJRMTf8/LZsws7GLix5Wo2BdkSTqgn+y/lJO+1eeM3vIgJV/n Yw17iDYzlTrUSbrHeVn44OwqKH/62MMZbX96e2QoC/0joiORfgHwHTPMJhe2ZyYJVGBnonQaqzk uBmv/wwxYg1BD7RJjtNpXRFGu+vVGVmHOZ8eLzjCYfAAXuXbkHmDY4SDB/WAHBiKNZw4cgSo0E7 xpCm32J3g150dvsCBfZqb5WhTc7DIf2BmbqyF8DVK59ZH0BGcckQJY24/d51PJnVrWeGWj8G4wf WWvcyIK6Y/VUoIH6vUYOhqbyA/0Wm4gVC7LkMmqdMt4nmvykf1lO0Q8iHUfqxLhij/1T9n8y/W4 A== X-Received: by 2002:a05:6a00:f8a:b0:847:9dd7:2683 with SMTP id d2e1a72fcca58-84f41df42ccmr6551184b3a.9.1786008984000; Thu, 06 Aug 2026 02:36:24 -0700 (PDT) Received: from intel.company.local ([210.184.73.204]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-84f453b0aeasm1043878b3a.13.2026.08.06.02.36.13 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 06 Aug 2026 02:36:23 -0700 (PDT) From: Wandun Chen To: catalin.marinas@arm.com, will@kernel.org, chenhuacai@kernel.org, pjw@kernel.org, palmer@dabbelt.com, aou@eecs.berkeley.edu, robh@kernel.org, saravanak@kernel.org, rppt@kernel.org, baoquan.he@linux.dev, pasha.tatashin@soleen.com, pratyush@kernel.org, m.szyprowski@samsung.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, loongarch@lists.linux.dev, linux-riscv@lists.infradead.org, devicetree@vger.kernel.org, linux-mm@kvack.org, kexec@lists.infradead.org, iommu@lists.linux.dev Cc: kernel@xen0n.name, alex@ghiti.fr, akpm@linux-foundation.org, ruirui.yang@linux.dev, robin.murphy@arm.com Subject: [PATCH v5 4/8] of: reserved_mem: mark /memreserve/ entries as MEMBLOCK_NODUMP Date: Thu, 6 Aug 2026 17:35:15 +0800 Message-ID: <20260806093519.2907771-5-chenwandun1@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260806093519.2907771-1-chenwandun1@gmail.com> References: <20260806093519.2907771-1-chenwandun1@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260806_023625_046101_49D99AC5 X-CRM114-Status: GOOD ( 16.94 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: Wandun Chen The /memreserve/ entries are memory reservations made by the bootloader or firmware, their contents are not needed for kernel crash analysis, so mark them MEMBLOCK_NODUMP to have kdump omit them from the vmcore. Entries that overlap a dumpable region (such as CMA) are left unmarked, because the pages of a dumpable region may carry crash-relevant data. Signed-off-by: Wandun Chen Tested-by: Meijing Zhao --- drivers/of/fdt.c | 2 ++ drivers/of/of_private.h | 1 + drivers/of/of_reserved_mem.c | 32 ++++++++++++++++++++++++++++++++ 3 files changed, 35 insertions(+) diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c index a64afc3ded3d..2aa888997e9b 100644 --- a/drivers/of/fdt.c +++ b/drivers/of/fdt.c @@ -1286,6 +1286,8 @@ void __init unflatten_device_tree(void) /* Save the statically-placed regions in the reserved_mem array */ fdt_scan_reserved_mem_late(); + fdt_mark_memreserve_nodump(); + /* Populate an empty root node when bootloader doesn't provide one */ if (!fdt) { fdt = (void *) __dtb_empty_root_begin; diff --git a/drivers/of/of_private.h b/drivers/of/of_private.h index 0ae16da066e2..667ce9e46aab 100644 --- a/drivers/of/of_private.h +++ b/drivers/of/of_private.h @@ -187,6 +187,7 @@ static inline struct device_node *__of_get_dma_parent(const struct device_node * int fdt_scan_reserved_mem(void); void __init fdt_scan_reserved_mem_late(void); +void __init fdt_mark_memreserve_nodump(void); bool of_fdt_device_is_available(const void *blob, unsigned long node); diff --git a/drivers/of/of_reserved_mem.c b/drivers/of/of_reserved_mem.c index f38d11df6f15..f0683b5d77b3 100644 --- a/drivers/of/of_reserved_mem.c +++ b/drivers/of/of_reserved_mem.c @@ -251,6 +251,38 @@ static void __init __rmem_check_for_overlap(void) } } +void __init fdt_mark_memreserve_nodump(void) +{ + u64 base, size; + int n; + const void *fdt = initial_boot_params; + + if (!IS_ENABLED(CONFIG_CRASH_DUMP)) + return; + + if (!fdt) + return; + + for (n = 0; ; n++) { + int i; + + if (fdt_get_mem_rsv(fdt, n, &base, &size)) + break; + if (!size) + break; + + for (i = 0; i < reserved_mem_count; i++) { + struct reserved_mem *rmem = &reserved_mem[i]; + + if (rmem->dumpable && base < rmem->base + rmem->size && + rmem->base < base + size) + break; + } + if (i == reserved_mem_count) + memblock_mark_nodump(base, size); + } +} + /** * fdt_scan_reserved_mem_late() - Scan FDT and initialize remaining reserved * memory regions. -- 2.43.0