linux-kernel - [PATCH V2 3/3] x86/numa_emulation: restructures numa_nodes

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Message-Id: <20170502130453.5933-4-richard.weiyang@gmail.com>
Date:   Tue,  2 May 2017 21:04:53 +0800
From:   Wei Yang <richard.weiyang@...il.com>
To:     kirill@...temov.name, bp@...en8.de, tglx@...utronix.de,
        mingo@...hat.com, hpa@...or.com, tj@...nel.org, rientjes@...gle.com
Cc:     linux-kernel@...r.kernel.org, Wei Yang <richard.weiyang@...il.com>
Subject: [PATCH V2 3/3] x86/numa_emulation: restructures numa_nodes_parsed from emulated nodes

By emulating numa, it may contains more or less nodes than physical nodes.
In numa_emulation(), numa_meminfo/numa_distance/__apicid_to_node is
restructured according to emulated nodes, except numa_nodes_parsed.

This patch restructures numa_nodes_parsed from emulated nodes.

Signed-off-by: Wei Yang <richard.weiyang@...il.com>
Acked-by: David Rientjes <rientjes@...gle.com>

---
v2: use nodes_clear(numa_nodes_parsedd);
---
 arch/x86/mm/numa_emulation.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/x86/mm/numa_emulation.c b/arch/x86/mm/numa_emulation.c
index a6d01931b9a1..6e5ccbfc3deb 100644
--- a/arch/x86/mm/numa_emulation.c
+++ b/arch/x86/mm/numa_emulation.c
@@ -391,6 +391,13 @@ void __init numa_emulation(struct numa_meminfo *numa_meminfo, int numa_dist_cnt)
 	/* commit */
 	*numa_meminfo = ei;
 
+	/* Make sure numa_nodes_parsed only contains emulated nodes */
+	nodes_clear(numa_nodes_parsed);
+	for (i = 0; i < ARRAY_SIZE(ei.blk); i++)
+		if (ei.blk[i].start != ei.blk[i].end &&
+		    ei.blk[i].nid != NUMA_NO_NODE)
+			node_set(ei.blk[i].nid, numa_nodes_parsed);
+
 	/*
 	 * Transform __apicid_to_node table to use emulated nids by
 	 * reverse-mapping phys_nid.  The maps should always exist but fall
-- 
2.11.0