linux-kernel - Re: [PATCH v1] drivers/base/memory.c: Don't store end_section

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Message-ID: <20190731141545.GV9330@dhcp22.suse.cz>
Date:   Wed, 31 Jul 2019 16:15:45 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     David Hildenbrand <david@...hat.com>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Pavel Tatashin <pasha.tatashin@...een.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Oscar Salvador <osalvador@...e.de>
Subject: Re: [PATCH v1] drivers/base/memory.c: Don't store end_section_nr in
 memory blocks

On Wed 31-07-19 16:04:10, David Hildenbrand wrote:
> On 31.07.19 15:42, David Hildenbrand wrote:
[...]
> > Powerpc userspace queries it:
> > https://groups.google.com/forum/#!msg/powerpc-utils-devel/dKjZCqpTxus/AwkstV2ABwAJ
> 
> FWIW, powerpc-utils also uses the "removable" property - which means
> we're also stuck with that unfortunately. :(

Yeah, I am aware of that and I strongly suspect this is actually in use
because it is terribly unreliable for any non-idle system. There is
simply no way to find out whether something is offlinable than to try
it.
-- 
Michal Hocko
SUSE Labs