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 X-Spam-Level: X-Spam-Status: No, score=-13.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6A923C4338F for ; Wed, 25 Aug 2021 13:51:54 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id D60F760E93 for ; Wed, 25 Aug 2021 13:51:53 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org D60F760E93 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=kaod.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=nongnu.org Received: from localhost ([::1]:54910 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mItJo-0004bO-V4 for qemu-devel@archiver.kernel.org; Wed, 25 Aug 2021 09:51:52 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:59378) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mItGH-0000cm-UT for qemu-devel@nongnu.org; Wed, 25 Aug 2021 09:48:13 -0400 Received: from us-smtp-delivery-44.mimecast.com ([207.211.30.44]:27658) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mItGG-0002Fi-EV for qemu-devel@nongnu.org; Wed, 25 Aug 2021 09:48:13 -0400 Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-1-AD8npnrNMtCd5McdznWiRg-1; Wed, 25 Aug 2021 09:47:57 -0400 X-MC-Unique: AD8npnrNMtCd5McdznWiRg-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id BCE77195D569; Wed, 25 Aug 2021 13:47:55 +0000 (UTC) Received: from bahia.lan (unknown [10.39.194.209]) by smtp.corp.redhat.com (Postfix) with ESMTP id 69EA360657; Wed, 25 Aug 2021 13:47:54 +0000 (UTC) Date: Wed, 25 Aug 2021 15:47:52 +0200 From: Greg Kurz To: Daniel Henrique Barboza Subject: Re: [PATCH v7 1/7] memory_hotplug.c: handle dev->id = NULL in acpi_memory_hotplug_write() Message-ID: <20210825154752.19bd9f4f@bahia.lan> In-Reply-To: <20210825004835.472919-2-danielhb413@gmail.com> References: <20210825004835.472919-1-danielhb413@gmail.com> <20210825004835.472919-2-danielhb413@gmail.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=groug@kaod.org X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: kaod.org Content-Type: text/plain; charset=WINDOWS-1252 Content-Transfer-Encoding: quoted-printable Received-SPF: softfail client-ip=207.211.30.44; envelope-from=groug@kaod.org; helo=us-smtp-delivery-44.mimecast.com X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_LOW=-0.7, SPF_HELO_NONE=0.001, SPF_SOFTFAIL=0.665 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: armbru@redhat.com, qemu-ppc@nongnu.org, qemu-devel@nongnu.org, david@gibson.dropbear.id.au Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On Tue, 24 Aug 2021 21:48:29 -0300 Daniel Henrique Barboza wrote: > qapi_event_send_mem_unplug_error() deals with @device being NULL by > replacing it with an empty string ("") when emitting the event. Aside > from the fact that this behavior (qapi visitor mapping NULL pointer to > "") can be patched/changed someday, there's also the lack of utility > that the event brings to listeners, e.g. "a memory unplug error happened > somewhere". >=20 > In theory we should just avoit emitting this event at all if dev->id is > NULL, but this would be an incompatible change to existing guests. > Instead, let's make the forementioned behavior explicit: if dev->id is > NULL, pass an empty string to qapi_event_send_mem_unplug_error(). >=20 > Suggested-by: Markus Armbruster > Signed-off-by: Daniel Henrique Barboza > --- Reviewed-by: Greg Kurz > hw/acpi/memory_hotplug.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) >=20 > diff --git a/hw/acpi/memory_hotplug.c b/hw/acpi/memory_hotplug.c > index af37889423..6a71de408b 100644 > --- a/hw/acpi/memory_hotplug.c > +++ b/hw/acpi/memory_hotplug.c > @@ -178,7 +178,7 @@ static void acpi_memory_hotplug_write(void *opaque, h= waddr addr, uint64_t data, > hotplug_handler_unplug(hotplug_ctrl, dev, &local_err); > if (local_err) { > trace_mhp_acpi_pc_dimm_delete_failed(mem_st->selector); > - qapi_event_send_mem_unplug_error(dev->id, > + qapi_event_send_mem_unplug_error(dev->id ? : "", > error_get_pretty(local_= err)); > error_free(local_err); > break;