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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Mon, 1 Jul 2019 12:27:56 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     Oscar Salvador <osalvador@...e.de>
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 01-07-19 11:36:44, Oscar Salvador wrote:
> 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?

And maybe we handle it then rather than have a static allocation that
everybody with hotremove configured has to pay for.
-- 
Michal Hocko
SUSE Labs