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Fri, 11 Sep 2020 16:26:09 GMT Received: from d06av25.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id C807511C052; Fri, 11 Sep 2020 16:27:42 +0000 (GMT) Received: from d06av25.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 1088011C04A; Fri, 11 Sep 2020 16:27:42 +0000 (GMT) Received: from pomme.local (unknown [9.145.47.39]) by d06av25.portsmouth.uk.ibm.com (Postfix) with ESMTP; Fri, 11 Sep 2020 16:27:41 +0000 (GMT) Subject: Re: [PATCH 3/3] mm: don't panic when links can't be created in sysfs To: Greg Kroah-Hartman Cc: akpm@linux-foundation.org, David Hildenbrand , Oscar Salvador , mhocko@kernel.org, linux-mm@kvack.org, "Rafael J . Wysocki" , nathanl@linux.ibm.com, cheloha@linux.ibm.com, Tony Luck , Fenghua Yu , linux-ia64@vger.kernel.org, linux-kernel@vger.kernel.org References: <20200911134831.53258-1-ldufour@linux.ibm.com> <20200911134831.53258-4-ldufour@linux.ibm.com> <20200911140100.GA3812164@kroah.com> From: Laurent Dufour Message-ID: <3713153c-d239-e6f9-fc1a-a3e4357ee069@linux.ibm.com> Date: Fri, 11 Sep 2020 18:27:41 +0200 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:68.0) Gecko/20100101 Thunderbird/68.12.0 MIME-Version: 1.0 In-Reply-To: <20200911140100.GA3812164@kroah.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.235,18.0.687 definitions=2020-09-11_08:2020-09-10,2020-09-11 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 impostorscore=0 mlxscore=0 bulkscore=0 clxscore=1015 lowpriorityscore=0 phishscore=0 mlxlogscore=999 suspectscore=0 spamscore=0 adultscore=0 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2009110131 X-Rspamd-Queue-Id: D0B30180F8B80 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam05 Content-Transfer-Encoding: quoted-printable 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: Le 11/09/2020 =C3=A0 16:01, Greg Kroah-Hartman a =C3=A9crit=C2=A0: > On Fri, Sep 11, 2020 at 03:48:31PM +0200, Laurent Dufour wrote: >> At boot time, or when doing memory hot-add operations, if the links in >> sysfs can't be created, the system is still able to run, so just repor= t the >> error in the kernel log. >> >> Since the number of memory blocks managed could be high, the messages = are >> rate limited. >> >> As a consequence, link_mem_sections() has no status to report anymore. >> >> Signed-off-by: Laurent Dufour >> Cc: David Hildenbrand >> --- >> drivers/base/node.c | 25 +++++++++++++++++-------- >> include/linux/node.h | 17 ++++++++--------- >> mm/memory_hotplug.c | 5 ++--- >> 3 files changed, 27 insertions(+), 20 deletions(-) >> >> diff --git a/drivers/base/node.c b/drivers/base/node.c >> index 862516c5a5ae..749a1c8ea992 100644 >> --- a/drivers/base/node.c >> +++ b/drivers/base/node.c >> @@ -811,12 +811,21 @@ static int register_mem_sect_under_node(struct m= emory_block *mem_blk, >> ret =3D sysfs_create_link_nowarn(&node_devices[nid]->dev.kobj, >> &mem_blk->dev.kobj, >> kobject_name(&mem_blk->dev.kobj)); >> - if (ret) >> - return ret; >> + if (ret && ret !=3D -EEXIST) >> + pr_err_ratelimited( >> + "can't create %s to %s link in sysfs (%d)\n", >> + kobject_name(&node_devices[nid]->dev.kobj), >> + kobject_name(&mem_blk->dev.kobj), ret); >=20 > dev_err_ratelimited()? Thanks Greg, I was not aware about this. > Same elsewhere in this patch. >=20 > thanks, >=20 > greg k-h >=20