From patchwork Thu Apr 14 18:22:51 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bjorn Helgaas X-Patchwork-Id: 12813869 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 7EEE7C433EF for ; Thu, 14 Apr 2022 18:23:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1344499AbiDNSZe (ORCPT ); Thu, 14 Apr 2022 14:25:34 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59044 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1344112AbiDNSZ1 (ORCPT ); Thu, 14 Apr 2022 14:25:27 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3F27CE8877; Thu, 14 Apr 2022 11:23:02 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id C326061583; Thu, 14 Apr 2022 18:23:01 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id DF3DBC385A8; Thu, 14 Apr 2022 18:23:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1649960581; bh=wzKfWIAdPADCpFjCVLCfLjso3Q5ZNWCch4+FqEXQvNM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=fn9lTUugH69h82pZPlriHFauOMJvUbju/Ke6lCCX8NWk3xUjcq7agauQAKIydtV8O pvfS5r6J+K7JamoFRg65p0lpVnJwpMwVAHAJCbbuPHqGHowgJV7HuDkcRndrXoeGUv LsWA9wKR1nTwSCOVHl/PqKrS+fTizmeMV8M5pqE1PNMZQq6t/4PhJ5wO9QIplVk8mw gjNm1hG9M10jzUIVpOfuHjuJXFoWljKVIREm/6EJoHT55sTaUCR1C8umvDKmUWMJMi X6tPdc0eTQl5TNdnrQc2bq9lB/3AUeX7l7o6NxifmwSOt3Sqn0672oHNv8nQ9tjRnt c1vOlvXx4UH/g== From: Bjorn Helgaas To: Hans de Goede , "Rafael J . Wysocki" , Borislav Petkov , "H . Peter Anvin" , Ingo Molnar Cc: Mika Westerberg , =?utf-8?q?Krzysztof_W?= =?utf-8?q?ilczy=C5=84ski?= , Myron Stowe , Juha-Pekka Heikkila , =?utf-8?q?Benoit_Gr?= =?utf-8?q?=C3=A9goire?= , Hui Wang , Kai-Heng Feng , linux-acpi@vger.kernel.org, linux-pci@vger.kernel.org, x86@kernel.org, linux-kernel@vger.kernel.org, Bjorn Helgaas Subject: [PATCH v2 2/3] x86: Log resource clipping for E820 regions Date: Thu, 14 Apr 2022 13:22:51 -0500 Message-Id: <20220414182252.758742-3-helgaas@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220414182252.758742-1-helgaas@kernel.org> References: <20220414182252.758742-1-helgaas@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org From: Bjorn Helgaas When remove_e820_regions() clips a resource because an E820 region overlaps it, log a note in dmesg to add in debugging. Signed-off-by: Bjorn Helgaas Acked-by: Rafael J. Wysocki --- arch/x86/kernel/resource.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/arch/x86/kernel/resource.c b/arch/x86/kernel/resource.c index 8ffe68437744..30d524adb012 100644 --- a/arch/x86/kernel/resource.c +++ b/arch/x86/kernel/resource.c @@ -1,5 +1,6 @@ // SPDX-License-Identifier: GPL-2.0 #include +#include #include static void resource_clip(struct resource *res, resource_size_t start, @@ -28,6 +29,7 @@ static void remove_e820_regions(struct resource *avail) int i; struct e820_entry *entry; u64 e820_start, e820_end; + struct resource orig = *avail; for (i = 0; i < e820_table->nr_entries; i++) { entry = &e820_table->entries[i]; @@ -35,6 +37,11 @@ static void remove_e820_regions(struct resource *avail) e820_end = entry->addr + entry->size - 1; resource_clip(avail, e820_start, e820_end); + if (orig.start != avail->start || orig.end != avail->end) { + pr_info("clipped %pR to %pR for e820 entry [mem %#010Lx-%#010Lx]\n", + &orig, avail, e820_start, e820_end); + orig = *avail; + } } }