linux-kernel - [PATCH v2 1/3] arm64/numa: export memory_add_physaddr_to_nid as EXPORT_SYMBOL

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Date:   Tue,  7 Jul 2020 13:59:15 +0800
From:   Jia He <justin.he@....com>
To:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Vishal Verma <vishal.l.verma@...el.com>,
        Dave Jiang <dave.jiang@...el.com>
Cc:     Michal Hocko <mhocko@...e.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Baoquan He <bhe@...hat.com>,
        Chuhong Yuan <hslester96@...il.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, linux-nvdimm@...ts.01.org,
        Kaly Xin <Kaly.Xin@....com>, Jia He <justin.he@....com>
Subject: [PATCH v2 1/3] arm64/numa: export memory_add_physaddr_to_nid as EXPORT_SYMBOL_GPL

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 <david@...hat.com>
Signed-off-by: Jia He <justin.he@....com>
---
 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);
-- 
2.17.1