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Message-ID: <20190925163154.GF4553@hirez.programming.kicks-ass.net>
Date:   Wed, 25 Sep 2019 18:31:54 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     Yunsheng Lin <linyunsheng@...wei.com>, catalin.marinas@....com,
        will@...nel.org, mingo@...hat.com, bp@...en8.de, rth@...ddle.net,
        ink@...assic.park.msu.ru, mattst88@...il.com,
        benh@...nel.crashing.org, paulus@...ba.org, mpe@...erman.id.au,
        heiko.carstens@...ibm.com, gor@...ux.ibm.com,
        borntraeger@...ibm.com, ysato@...rs.sourceforge.jp,
        dalias@...c.org, davem@...emloft.net, ralf@...ux-mips.org,
        paul.burton@...s.com, jhogan@...nel.org, jiaxun.yang@...goat.com,
        chenhc@...ote.com, akpm@...ux-foundation.org, rppt@...ux.ibm.com,
        anshuman.khandual@....com, tglx@...utronix.de, cai@....pw,
        robin.murphy@....com, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, hpa@...or.com, x86@...nel.org,
        dave.hansen@...ux.intel.com, luto@...nel.org, len.brown@...el.com,
        axboe@...nel.dk, dledford@...hat.com, jeffrey.t.kirsher@...el.com,
        linux-alpha@...r.kernel.org, naveen.n.rao@...ux.vnet.ibm.com,
        mwb@...ux.vnet.ibm.com, linuxppc-dev@...ts.ozlabs.org,
        linux-s390@...r.kernel.org, linux-sh@...r.kernel.org,
        sparclinux@...r.kernel.org, tbogendoerfer@...e.de,
        linux-mips@...r.kernel.org, rafael@...nel.org,
        gregkh@...uxfoundation.org
Subject: Re: [PATCH v6] numa: make node_to_cpumask_map() NUMA_NO_NODE aware

On Wed, Sep 25, 2019 at 03:25:44PM +0200, Michal Hocko wrote:
> I am sorry but I still do not understand why you consider this whack a
> mole better then simply live with the fact that NUMA_NO_NODE is a
> reality and that using the full cpu mask is a reasonable answer to that.

Because it doesn't make physical sense. A device _cannot_ be local to
all CPUs in a NUMA system.

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