linux-kernel - Re: [PATCH v3 10/11] mm/memory_hotplug: Make unregister_memory_block_under

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Message-ID: <20190701093640.GA17349@linux>
Date:   Mon, 1 Jul 2019 11:36:44 +0200
From:   Oscar Salvador <osalvador@...e.de>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     David Hildenbrand <david@...hat.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, linux-ia64@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-s390@...r.kernel.org,
        linux-sh@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        akpm@...ux-foundation.org, Dan Williams <dan.j.williams@...el.com>,
        Wei Yang <richard.weiyang@...il.com>,
        Igor Mammedov <imammedo@...hat.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Alex Deucher <alexander.deucher@....com>,
        "David S. Miller" <davem@...emloft.net>,
        Mark Brown <broonie@...nel.org>,
        Chris Wilson <chris@...is-wilson.co.uk>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>
Subject: Re: [PATCH v3 10/11] mm/memory_hotplug: Make
 unregister_memory_block_under_nodes() never fail

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