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[195.135.220.15]) by mx.google.com with ESMTPS id s17si4166008eda.250.2019.04.25.22.48.04 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 25 Apr 2019 22:48:05 -0700 (PDT) Received-SPF: softfail (google.com: domain of transitioning mhocko@kernel.org does not designate 195.135.220.15 as permitted sender) client-ip=195.135.220.15; Authentication-Results: mx.google.com; spf=softfail (google.com: domain of transitioning mhocko@kernel.org does not designate 195.135.220.15 as permitted sender) smtp.mailfrom=mhocko@kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=kernel.org X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id F2779AD8C; Fri, 26 Apr 2019 05:48:03 +0000 (UTC) Date: Fri, 26 Apr 2019 07:47:58 +0200 From: Michal Hocko To: Andrew Morton Cc: Christopher Lameter , mm-commits@vger.kernel.org, yong.wu@mediatek.com, yingjoe.chen@mediatek.com, yehs1@lenovo.com, willy@infradead.org, will.deacon@arm.com, vbabka@suse.cz, tfiga@google.com, stable@vger.kernel.org, rppt@linux.vnet.ibm.com, robin.murphy@arm.com, rientjes@google.com, penberg@kernel.org, mgorman@techsingularity.net, matthias.bgg@gmail.com, joro@8bytes.org, iamjoonsoo.kim@lge.com, hsinyi@chromium.org, hch@infradead.org, Alexander.Levin@microsoft.com, drinkcat@chromium.org, linux-mm@kvack.org Subject: Re: + mm-add-sys-kernel-slab-cache-cache_dma32.patch added to -mm tree Message-ID: <20190426054758.GE12337@dhcp22.suse.cz> References: <20190319183751.rWqkf%akpm@linux-foundation.org> <20190319191721.GC30433@dhcp22.suse.cz> <01000169988825c0-df946577-83d4-4fc5-a329-52b65bec9735-000000@email.amazonses.com> <20190320070516.GD30433@dhcp22.suse.cz> <20190425214615.b46db647b6a6a82db92e4143@linux-foundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190425214615.b46db647b6a6a82db92e4143@linux-foundation.org> User-Agent: Mutt/1.10.1 (2018-07-13) X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Thu 25-04-19 21:46:15, Andrew Morton wrote: > This patch is presently in limbo. Should we just drop it? There was no strong justification for it except "we alredy do export dma cache so why not dma32". Christopher was arguing that slabinfo (in tree tool) is going to use it but that merely prints it without any additional considerations. So I would just drop it until there is a real use case (aka somebody is going to use it for something _useful_). -- Michal Hocko SUSE Labs