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Tue, 07 Jul 2020 08:26:36 -0400 X-MC-Unique: N86uCUT4PreDGAunxSVXnw-1 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 0E1EE8914B7; Tue, 7 Jul 2020 12:26:12 +0000 (UTC) Received: from [10.36.114.87] (ovpn-114-87.ams2.redhat.com [10.36.114.87]) by smtp.corp.redhat.com (Postfix) with ESMTP id E269B10013D7; Tue, 7 Jul 2020 12:26:08 +0000 (UTC) Subject: Re: [PATCH v2 1/3] arm64/numa: export memory_add_physaddr_to_nid as EXPORT_SYMBOL_GPL To: Mike Rapoport , Michal Hocko Cc: Jia He , Catalin Marinas , Will Deacon , Dan Williams , Vishal Verma , Dave Jiang , Andrew Morton , Baoquan He , Chuhong Yuan , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-nvdimm@lists.01.org, Kaly Xin References: <20200707055917.143653-1-justin.he@arm.com> <20200707055917.143653-2-justin.he@arm.com> <20200707115454.GN5913@dhcp22.suse.cz> <20200707121302.GB9411@linux.ibm.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.9.0 MIME-Version: 1.0 In-Reply-To: <20200707121302.GB9411@linux.ibm.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 07.07.20 14:13, Mike Rapoport wrote: > On Tue, Jul 07, 2020 at 01:54:54PM +0200, Michal Hocko wrote: >> On Tue 07-07-20 13:59:15, Jia He wrote: >>> This exports memory_add_physaddr_to_nid() for module driver to use. >>> >>> memory_add_physaddr_to_nid() is a fallback option to get the nid in case >>> NUMA_NO_NID is detected. >>> >>> Suggested-by: David Hildenbrand >>> Signed-off-by: Jia He >>> --- >>> arch/arm64/mm/numa.c | 5 +++-- >>> 1 file changed, 3 insertions(+), 2 deletions(-) >>> >>> diff --git a/arch/arm64/mm/numa.c b/arch/arm64/mm/numa.c >>> index aafcee3e3f7e..7eeb31740248 100644 >>> --- a/arch/arm64/mm/numa.c >>> +++ b/arch/arm64/mm/numa.c >>> @@ -464,10 +464,11 @@ void __init arm64_numa_init(void) >>> >>> /* >>> * We hope that we will be hotplugging memory on nodes we already know about, >>> - * such that acpi_get_node() succeeds and we never fall back to this... >>> + * such that acpi_get_node() succeeds. But when SRAT is not present, the node >>> + * id may be probed as NUMA_NO_NODE by acpi, Here provide a fallback option. >>> */ >>> int memory_add_physaddr_to_nid(u64 addr) >>> { >>> - pr_warn("Unknown node for memory at 0x%llx, assuming node 0\n", addr); >>> return 0; >>> } >>> +EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid); >> >> Does it make sense to export a noop function? Wouldn't make more sense >> to simply make it static inline somewhere in a header? I haven't checked >> whether there is an easy way to do that sanely bu this just hit my eyes. > > We'll need to either add a CONFIG_ option or arch specific callback to > make both non-empty (x86, powerpc, ia64) and empty (arm64, sh) > implementations coexist ... Note: I have a similar dummy (return 0) patch for s390x lying around here. -- Thanks, David / dhildenb