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Date: Mon, 1 Jul 2019 11:36:44 +0200
From: Oscar Salvador <osalvador@suse.de>
To: Michal Hocko <mhocko@kernel.org>
Subject: Re: [PATCH v3 10/11] mm/memory_hotplug: Make
 unregister_memory_block_under_nodes() never fail
Message-ID: <20190701093640.GA17349@linux>
References: <20190527111152.16324-1-david@redhat.com>
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Cc: linux-s390@vger.kernel.org, Alex Deucher <alexander.deucher@amd.com>,
 linux-ia64@vger.kernel.org, David Hildenbrand <david@redhat.com>,
 Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
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 Jonathan Cameron <Jonathan.Cameron@huawei.com>,
 "Rafael J. Wysocki" <rafael@kernel.org>, Igor Mammedov <imammedo@redhat.com>,
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On Mon, Jul 01, 2019 at 10:51:44AM +0200, Michal Hocko wrote:
> Yeah, we do not allow to offline multi zone (node) ranges so the current
> code seems to be over engineered.
> 
> Anyway, I am wondering why do we have to strictly check for already
> removed nodes links. Is the sysfs code going to complain we we try to
> remove again?

No, sysfs will silently "fail" if the symlink has already been removed.
At least that is what I saw last time I played with it.

I guess the question is what if sysfs handling changes in the future
and starts dropping warnings when trying to remove a symlink is not there.
Maybe that is unlikely to happen?

-- 
Oscar Salvador
SUSE L3