linux-kernel - Re: [PATCH -next v2] mm/hotplug: fix a null-ptr-deref during NUMA boot

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Message-ID: <20190626135744.GX17798@dhcp22.suse.cz>
Date:   Wed, 26 Jun 2019 15:57:44 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     Pingfan Liu <kernelfans@...il.com>
Cc:     Qian Cai <cai@....pw>, Andrew Morton <akpm@...ux-foundation.org>,
        Barret Rhoden <brho@...gle.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Ingo Molnar <mingo@...e.hu>,
        Oscar Salvador <osalvador@...e.de>,
        Andy Lutomirski <luto@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>, linux-mm@...ck.org,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -next v2] mm/hotplug: fix a null-ptr-deref during NUMA
 boot

On Mon 24-06-19 16:42:20, Pingfan Liu wrote:
> Hi Michal,
> 
> What about dropping the change of the online definition of your patch,
> just do the following?

I am sorry but I am unlikely to find some more time to look into this. I
am willing to help reviewing but I will not find enough time to focus on
this to fix up the patch. Are you willing to work on this and finish the
patch? It is a very tricky area with side effects really hard to see in
advance but going with a robust fix is definitely worth the effort.

Thanks!
-- 
Michal Hocko
SUSE Labs