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powerpc/mm: allow memory hotplug into a memoryless node

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Patch series "enable movable nodes on non-x86 configs", v7.

This patchset allows more configs to make use of movable nodes.  When
CONFIG_MOVABLE_NODE is selected, there are two ways to introduce such
nodes into the system:

1. Discover movable nodes at boot. Currently this is only possible on
   x86, but we will enable configs supporting fdt to do the same.

2. Hotplug and online all of a node's memory using online_movable. This
   is already possible on any config supporting memory hotplug, not
   just x86, but the Kconfig doesn't say so. We will fix that.

We'll also remove some cruft on power which would prevent (2).

This patch (of 5):

Remove the check which prevents us from hotplugging into an empty node.

The original commit b226e46212 ("[PATCH] powerpc: don't add memory to
empty node/zone"), states that this was intended to be a temporary measure.
It is a workaround for an oops which no longer occurs.

Link: http://lkml.kernel.org/r/1479160961-25840-2-git-send-email-arbab@linux.vnet.ibm.com
Signed-off-by: Reza Arbab <arbab@linux.vnet.ibm.com>
Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Acked-by: Balbir Singh <bsingharora@gmail.com>
Acked-by: Michael Ellerman <mpe@ellerman.id.au>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Alistair Popple <apopple@au1.ibm.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Bharata B Rao <bharata@linux.vnet.ibm.com>
Cc: Frank Rowand <frowand.list@gmail.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Nathan Fontenot <nfont@linux.vnet.ibm.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Stewart Smith <stewart@linux.vnet.ibm.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Reza Arbab 2016-12-12 16:42:52 -08:00 committed by Linus Torvalds
parent 8d303e44e9
commit 4a3bac4e3a
1 changed files with 1 additions and 12 deletions
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13
arch/powerpc/mm/numa.c
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@ -1085,7 +1085,7 @@ static int hot_add_node_scn_to_nid(unsigned long scn_addr)
int hot_add_scn_to_nid(unsigned long scn_addr)
{
struct device_node *memory = NULL;
int nid, found = 0;
int nid;
if (!numa_enabled || (min_common_depth < 0))
return first_online_node;
@ -1101,17 +1101,6 @@ int hot_add_scn_to_nid(unsigned long scn_addr)
if (nid < 0 || !node_online(nid))
nid = first_online_node;
if (NODE_DATA(nid)->node_spanned_pages)
return nid;
for_each_online_node(nid) {
if (NODE_DATA(nid)->node_spanned_pages) {
found = 1;
break;
}
}
BUG_ON(!found);
return nid;
}