linux-kernel - [PATCH v2 1/2] x86/numa_emulation: Fix emulated-to-physical node mapping

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Date:   Fri, 06 Jul 2018 09:08:01 -0700
From:   Dan Williams <dan.j.williams@...el.com>
To:     mingo@...nel.org
Cc:     Wei Yang <richard.weiyang@...il.com>,
        David Rientjes <rientjes@...gle.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        "H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
        x86@...nel.org, linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        x86@...nel.org
Subject: [PATCH v2 1/2] x86/numa_emulation: Fix emulated-to-physical node
 mapping

Without this change the distance table calculation for emulated nodes
may use the wrong numa node and report an incorrect distance.

Cc: Wei Yang <richard.weiyang@...il.com>
Cc: David Rientjes <rientjes@...gle.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: "H. Peter Anvin" <hpa@...or.com>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: <x86@...nel.org>
Signed-off-by: Dan Williams <dan.j.williams@...el.com>
---
 arch/x86/mm/numa_emulation.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/mm/numa_emulation.c b/arch/x86/mm/numa_emulation.c
index 34a2a3bfde9c..22cbad56acab 100644
--- a/arch/x86/mm/numa_emulation.c
+++ b/arch/x86/mm/numa_emulation.c
@@ -61,7 +61,7 @@ static int __init emu_setup_memblk(struct numa_meminfo *ei,
 	eb->nid = nid;
 
 	if (emu_nid_to_phys[nid] == NUMA_NO_NODE)
-		emu_nid_to_phys[nid] = nid;
+		emu_nid_to_phys[nid] = pb->nid;
 
 	pb->start += size;
 	if (pb->start >= pb->end) {