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From:   Linus Torvalds <torvalds@linux-foundation.org>
Date:   Wed, 17 Jan 2018 14:15:34 -0800
Message-ID: <CA+55aFz3e073ng0s5MA9+_a0r_TMfAjNCKqKuWSAv=uRs2CmuA@mail.gmail.com>
Subject: Re: [mm 4.15-rc8] Random oopses under memory pressure.
To:     Dave Hansen <dave.hansen@linux.intel.com>
Cc:     Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>,
        "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Johannes Weiner <hannes@cmpxchg.org>,
        Joonsoo Kim <iamjoonsoo.kim@lge.com>,
        Mel Gorman <mgorman@techsingularity.net>,
        Tony Luck <tony.luck@intel.com>,
        Vlastimil Babka <vbabka@suse.cz>,
        Michal Hocko <mhocko@kernel.org>,
        Ingo Molnar <mingo@kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        linux-mm <linux-mm@kvack.org>,
        "the arch/x86 maintainers" <x86@kernel.org>
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On Wed, Jan 17, 2018 at 2:00 PM, Dave Hansen
<dave.hansen@linux.intel.com> wrote:
>
> I thought that page_zone_id() stuff was there to prevent this kind of
> cross-zone stuff from happening.

Ahh, that was the part I missed. Yeah looks like that checks things
properly. Although the mask generation is *so* confusing that I
stopped following it and will just take your word for it ;)

             Linus