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Tue, 07 Jul 2020 07:35:47 -0400 X-MC-Unique: mnU8lwttOT242U7GYxmB4Q-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 34356107ACF9; Tue, 7 Jul 2020 11:35:45 +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 534FB7166C; Tue, 7 Jul 2020 11:35:42 +0000 (UTC) Subject: Re: [PATCH v2 1/3] arm64/numa: export memory_add_physaddr_to_nid as EXPORT_SYMBOL_GPL To: Jia He , Catalin Marinas , Will Deacon , Dan Williams , Vishal Verma , Dave Jiang Cc: Michal Hocko , Andrew Morton , Mike Rapoport , 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> 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: <20200707055917.143653-2-justin.he@arm.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 X-Rspamd-Queue-Id: B76AC1804B661 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam01 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 07.07.20 07:59, 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); > We could turn that into a pr_info() instead, but the effect is visible to user space (e.g., which memory blocks belong to which node in sysfs), so this can be debugged easily on demand. Reviewed-by: David Hildenbrand -- Thanks, David / dhildenb