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[209.132.183.28]) by mx.google.com with ESMTPS id a62si3275695qke.96.2019.04.03.01.20.38 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 03 Apr 2019 01:20:38 -0700 (PDT) Received-SPF: pass (google.com: domain of david@redhat.com designates 209.132.183.28 as permitted sender) client-ip=209.132.183.28; Authentication-Results: mx.google.com; spf=pass (google.com: domain of david@redhat.com designates 209.132.183.28 as permitted sender) smtp.mailfrom=david@redhat.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 52B1E2026B; Wed, 3 Apr 2019 08:20:37 +0000 (UTC) Received: from [10.36.117.246] (ovpn-117-246.ams2.redhat.com [10.36.117.246]) by smtp.corp.redhat.com (Postfix) with ESMTP id 79C4E17AF3; Wed, 3 Apr 2019 08:20:33 +0000 (UTC) Subject: Re: [PATCH 1/6] arm64/mm: Enable sysfs based memory hot add interface To: Anshuman Khandual , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, akpm@linux-foundation.org, will.deacon@arm.com, catalin.marinas@arm.com Cc: mhocko@suse.com, mgorman@techsingularity.net, james.morse@arm.com, mark.rutland@arm.com, robin.murphy@arm.com, cpandya@codeaurora.org, arunks@codeaurora.org, dan.j.williams@intel.com, osalvador@suse.de, logang@deltatee.com, pasha.tatashin@oracle.com, cai@lca.pw References: <1554265806-11501-1-git-send-email-anshuman.khandual@arm.com> <1554265806-11501-2-git-send-email-anshuman.khandual@arm.com> From: David Hildenbrand Openpgp: preference=signencrypt Autocrypt: addr=david@redhat.com; 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Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.4.0 MIME-Version: 1.0 In-Reply-To: <1554265806-11501-2-git-send-email-anshuman.khandual@arm.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.29]); Wed, 03 Apr 2019 08:20:38 +0000 (UTC) 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 03.04.19 06:30, Anshuman Khandual wrote: > Sysfs memory probe interface (/sys/devices/system/memory/probe) can accept > starting physical address of an entire memory block to be hot added into > the kernel. This is in addition to the existing ACPI based interface. This > just enables it with the required config CONFIG_ARCH_MEMORY_PROBE. > We recently discussed that the similar interface for removal should rather be moved to a debug/test module I wonder if we should try to do the same for the sysfs probing interface. Rather try to get rid of it than open the doors for more users. > Signed-off-by: Anshuman Khandual > --- > arch/arm64/Kconfig | 9 +++++++++ > 1 file changed, 9 insertions(+) > > diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig > index 7e34b9e..a2418fb 100644 > --- a/arch/arm64/Kconfig > +++ b/arch/arm64/Kconfig > @@ -266,6 +266,15 @@ config HAVE_GENERIC_GUP > config ARCH_ENABLE_MEMORY_HOTPLUG > def_bool y > > +config ARCH_MEMORY_PROBE > + bool "Enable /sys/devices/system/memory/probe interface" > + depends on MEMORY_HOTPLUG > + help > + This option enables a sysfs /sys/devices/system/memory/probe > + interface for testing. See Documentation/memory-hotplug.txt > + for more information. If you are unsure how to answer this > + question, answer N. > + > config SMP > def_bool y > > -- Thanks, David / dhildenb