linux-kernel - [PATCH v2 2/3] powerpc/numa: Prefer node id queried from vphn

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Message-Id: <20200428093836.27190-3-srikar@linux.vnet.ibm.com>
Date:   Tue, 28 Apr 2020 15:08:35 +0530
From:   Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
        linuxppc-dev@...ts.ozlabs.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, Michal Hocko <mhocko@...e.com>,
        Mel Gorman <mgorman@...e.de>, Vlastimil Babka <vbabka@...e.cz>,
        "Kirill A. Shutemov" <kirill@...temov.name>,
        Christopher Lameter <cl@...ux.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [PATCH v2 2/3] powerpc/numa: Prefer node id queried from vphn

Node id queried from the static device tree may not
be correct. For example: it may always show 0 on a shared processor.
Hence prefer the node id queried from vphn and fallback on the device tree
based node id if vphn query fails.

Cc: linuxppc-dev@...ts.ozlabs.org
Cc: linux-mm@...ck.org
Cc: linux-kernel@...r.kernel.org
Cc: Michal Hocko <mhocko@...e.com>
Cc: Mel Gorman <mgorman@...e.de>
Cc: Vlastimil Babka <vbabka@...e.cz>
Cc: "Kirill A. Shutemov" <kirill@...temov.name>
Cc: Christopher Lameter <cl@...ux.com>
Cc: Michael Ellerman <mpe@...erman.id.au>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
---
Changelog v1:->v2:
- Rebased to v5.7-rc3

 arch/powerpc/mm/numa.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/arch/powerpc/mm/numa.c b/arch/powerpc/mm/numa.c
index b3615b7fdbdf..281531340230 100644
--- a/arch/powerpc/mm/numa.c
+++ b/arch/powerpc/mm/numa.c
@@ -719,20 +719,20 @@ static int __init parse_numa_properties(void)
 	 */
 	for_each_present_cpu(i) {
 		struct device_node *cpu;
-		int nid;
-
-		cpu = of_get_cpu_node(i, NULL);
-		BUG_ON(!cpu);
-		nid = of_node_to_nid_single(cpu);
-		of_node_put(cpu);
+		int nid = vphn_get_nid(i);
 
 		/*
 		 * Don't fall back to default_nid yet -- we will plug
 		 * cpus into nodes once the memory scan has discovered
 		 * the topology.
 		 */
-		if (nid < 0)
-			continue;
+		if (nid == NUMA_NO_NODE) {
+			cpu = of_get_cpu_node(i, NULL);
+			if (cpu) {
+				nid = of_node_to_nid_single(cpu);
+				of_node_put(cpu);
+			}
+		}
 		node_set_online(nid);
 	}
 
-- 
2.20.1