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Wed, 2 Jul 2025 13:00:02 GMT Received: from smtpav04.dal12v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id D3F3658052; Wed, 2 Jul 2025 13:00:01 +0000 (GMT) Received: from smtpav04.dal12v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 6D80E58056; Wed, 2 Jul 2025 12:59:57 +0000 (GMT) Received: from [9.109.245.113] (unknown [9.109.245.113]) by smtpav04.dal12v.mail.ibm.com (Postfix) with ESMTP; Wed, 2 Jul 2025 12:59:57 +0000 (GMT) Message-ID: <83012fcc-36ca-41fe-8e2e-949f1ba8adf3@linux.ibm.com> Date: Wed, 2 Jul 2025 18:29:56 +0530 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] drivers/base/node: Handle error properly in register_one_node() To: Oscar Salvador Cc: David Hildenbrand , Andrew Morton , Zi Yan , Greg Kroah-Hartman , Ritesh Harjani , linux-mm@kvack.org, linux-kernel@vger.kernel.org, "Rafael J . Wysocki" , Danilo Krummrich , Jonathan Cameron , Alison Schofield , Yury Norov , Dave Jiang , KAMEZAWA Hiroyuki References: <20250702112856.295176-1-donettom@linux.ibm.com> Content-Language: en-US From: Donet Tom In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: KsvhkdlY5mZVFFCwx_OZVlYOTrN9kZJI X-Proofpoint-GUID: CODY8eJDmmBxGMhQC2uqcGZLUk512KwG X-Authority-Analysis: v=2.4 cv=Ib6HWXqa c=1 sm=1 tr=0 ts=68652d54 cx=c_pps a=3Bg1Hr4SwmMryq2xdFQyZA==:117 a=3Bg1Hr4SwmMryq2xdFQyZA==:17 a=IkcTkHD0fZMA:10 a=Wb1JkmetP80A:10 a=VwQbUJbxAAAA:8 a=VnNF1IyMAAAA:8 a=rKeXGq08CVa402lCTmoA:9 a=QEXdDO2ut3YA:10 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwNzAyMDEwMCBTYWx0ZWRfX3hT/yjabbT3i w/gdG81JKjWeRY4nV949pIJZDhff9p1NgP7Ku529LOfV4LGMRRmxYAAjbJ1bamjdZe3Yod7YlVS pRBaJ8yFMuj269SNSwp5M01PXzjkfS7HTVWBxwsaQ6iKdkSGpvZ02CN/ep15xk+steqpOTeZsWV uflasJ8/57Ep0FVSryBCMGSa8DJDudBIoaIokFEGjjM6zZm1XfRNi26DCG/y8Mw/tgOi3ftfMud XGq4U/dlbKDUUzvC004ZRRizXBiJA8L7Z75iZyXC9j043lhaaofi8hvECe0/V8Qxjq+UOUnM33R rASaq6yySQbVvzKt46fsXc6wdW+soOa216/TKi42aCdaWshhVXfBTjMBoPeyRMBSrf1fKf7O7u2 TDB5WnN44T2Cn+3ZowPXVPVOFE6FJJJYiYDvSi/Fie1R1TbThON/lp9f+qVULgxeyOs1ZbRM X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1099,Hydra:6.1.7,FMLib:17.12.80.40 definitions=2025-07-02_01,2025-06-27_01,2025-03-28_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 suspectscore=0 clxscore=1015 mlxlogscore=842 lowpriorityscore=0 impostorscore=0 mlxscore=0 malwarescore=0 spamscore=0 priorityscore=1501 adultscore=0 bulkscore=0 classifier=spam authscore=0 authtc=n/a authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2505280000 definitions=main-2507020100 X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: AFAAC40004 X-Stat-Signature: sgfzu86gbi8wei7dag17n5y5h5h66ap4 X-Rspam-User: X-HE-Tag: 1751461216-368746 X-HE-Meta: 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 EH4LX3N0 UIQiufCk0pxBsRKNxT2+3A0n8GVkfIbQ1pM4H6nYKW06fEAUVWqUhfZCwCnJSWsRphiuHJrw8V/pUUfFdPWQhxyDFvQ6dnrbmwXVcsssNgDABK71Utue7dLWkdmvFAT/885cjVgdkYzS5Bq1hvif8Z8rm2pVHa0Z35+EsyptYznEg4/C1vK0R7g03pSN5gt0lLNMEJgQLAQK4CDapJdPXROBSbeEg8KB0voaB7YlyU6Kj4sEpcm0UfkOdnEh9Ow/kxzArMHfMITOidXJy4duFPL5CHfP5O8R1cpPfU/1V1Dz1kguIAupoRUQ8U3MwGklLkrBaHgcgtLqZaQFORWDlFOw6fMhLP52xW57PrGwh1D78DVTVpwqAvdkWeGAflj3h1AxTLm+qltDdRe8= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 7/2/25 6:16 PM, Oscar Salvador wrote: > On Wed, Jul 02, 2025 at 06:28:56AM -0500, Donet Tom wrote: >> If register_node() returns an error, it is not handled correctly. >> The function will proceed further and try to register CPUs under the >> node, which is not correct. >> >> So, in this patch, if register_node() returns an error, we return >> immediately from the function. >> >> Signed-off-by: Donet Tom >> --- >> > ... >> diff --git a/drivers/base/node.c b/drivers/base/node.c >> index bef84f01712f..aec991b4c0b2 100644 >> --- a/drivers/base/node.c >> +++ b/drivers/base/node.c >> @@ -885,6 +885,8 @@ int register_one_node(int nid) >> node_devices[nid] = node; >> >> error = register_node(node_devices[nid], nid); >> + if (error) >> + return error; > Ok, all current callers (based on mm-unstable) panic or BUG() if this fails, > but powerpc, in init_phb_dynamic(), which keeps on going. > Unless it panics somewhere down the road as well. > > So I think we need to: > > node_devices[nid] = NULL > kfree(node) > > ? Yes, I will add this too. But one question: if register_node() fails, is it okay to continue, or should we panic? What is the correct way to handle this? > Also, once Hannes fix lands, we might need that as well. > > Anyway, I'd suggest you hold on until Hannes fix lands, so we can later > rebase all your mem-hotplug on top of that [1]. Sure > > [1] https://lore.kernel.org/linux-mm/86f89a65-f0f6-4462-9eea-ac691de2f3b6@suse.de/T/#mbf392eb390b8053f96be50da3b40dfd9b62dd389 > >