linux-kernel - [PATCH V2 2/2]: powerpc/hotplug/mm: Fix hot-add memory node assoc

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Message-Id: <9b006866-5a8e-dc05-d603-bfe8eb02eef2@linux.vnet.ibm.com>
Date:   Thu, 25 May 2017 12:37:40 -0500
From:   Michael Bringmann <mwb@...ux.vnet.ibm.com>
To:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Cc:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Reza Arbab <arbab@...ux.vnet.ibm.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Bharata B Rao <bharata@...ux.vnet.ib>,
        Balbir Singh <bsingharora@...il.com>,
        Michael Bringmann <mwb@...ux.vnet.ibm.com>,
        Shailendra Singh <shailendras@...dia.com>,
        "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Subject: [PATCH V2 2/2]: powerpc/hotplug/mm: Fix hot-add memory node assoc


Removing or adding memory via the PowerPC hotplug interface shows
anomalies in the association between memory and nodes.  The code
was updated to ensure that all nodes found at boot are still available
to subsequent DLPAR hotplug-memory operations, even if they are not
needed at boot time.

Signed-off-by: Michael Bringmann <mwb@...ux.vnet.ibm.com>
---
Changes in V2:
  -- Simplify patches to ensure more nodes in possible map, removing
     code from PowerPC numa.c that constrained possible map to size
     of online map.
---
 arch/powerpc/mm/numa.c |    7 -------
 1 file changed, 7 deletions(-)

diff --git a/arch/powerpc/mm/numa.c b/arch/powerpc/mm/numa.c
index 15c2dd5..18f3038 100644
--- a/arch/powerpc/mm/numa.c
+++ b/arch/powerpc/mm/numa.c
@@ -907,13 +907,6 @@ void __init initmem_init(void)
 
 	memblock_dump_all();
 
-	/*
-	 * Reduce the possible NUMA nodes to the online NUMA nodes,
-	 * since we do not support node hotplug. This ensures that  we
-	 * lower the maximum NUMA node ID to what is actually present.
-	 */
-	nodes_and(node_possible_map, node_possible_map, node_online_map);
-
 	for_each_online_node(nid) {
 		unsigned long start_pfn, end_pfn;