-stable review patch. If anyone has any objections, please let us know.
------------------
From: Andy Whitcroft <[email protected]>
Revert "[PATCH] Remove SPAN_OTHER_NODES config definition"
This reverts commit f62859bb6871c5e4a8e591c60befc8caaf54db8c.
Revert "[PATCH] mm: remove arch independent NODES_SPAN_OTHER_NODES"
This reverts commit a94b3ab7eab4edcc9b2cb474b188f774c331adf7.
Also update the comments to indicate that this is still required
and where its used.
Signed-off-by: Andy Whitcroft <[email protected]>
Cc: Paul Mackerras <[email protected]>
Cc: Mike Kravetz <[email protected]>
Cc: Benjamin Herrenschmidt <[email protected]>
Acked-by: Mel Gorman <[email protected]>
Acked-by: Will Schmidt <[email protected]>
Cc: Christoph Lameter <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
Signed-off-by: Chris Wright <[email protected]>
---
arch/powerpc/Kconfig | 9 +++++++++
arch/powerpc/configs/pseries_defconfig | 1 +
include/linux/mmzone.h | 6 ++++++
mm/page_alloc.c | 2 ++
4 files changed, 18 insertions(+)
--- linux-2.6.18.1.orig/arch/powerpc/Kconfig
+++ linux-2.6.18.1/arch/powerpc/Kconfig
@@ -729,6 +729,15 @@ config ARCH_MEMORY_PROBE
def_bool y
depends on MEMORY_HOTPLUG
+# Some NUMA nodes have memory ranges that span
+# other nodes. Even though a pfn is valid and
+# between a node's start and end pfns, it may not
+# reside on that node. See memmap_init_zone()
+# for details.
+config NODES_SPAN_OTHER_NODES
+ def_bool y
+ depends on NEED_MULTIPLE_NODES
+
config PPC_64K_PAGES
bool "64k page size"
depends on PPC64
--- linux-2.6.18.1.orig/arch/powerpc/configs/pseries_defconfig
+++ linux-2.6.18.1/arch/powerpc/configs/pseries_defconfig
@@ -184,6 +184,7 @@ CONFIG_SPLIT_PTLOCK_CPUS=4
CONFIG_MIGRATION=y
CONFIG_RESOURCES_64BIT=y
CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID=y
+CONFIG_NODES_SPAN_OTHER_NODES=y
# CONFIG_PPC_64K_PAGES is not set
CONFIG_SCHED_SMT=y
CONFIG_PROC_DEVICETREE=y
--- linux-2.6.18.1.orig/include/linux/mmzone.h
+++ linux-2.6.18.1/include/linux/mmzone.h
@@ -632,6 +632,12 @@ void sparse_init(void);
#define sparse_index_init(_sec, _nid) do {} while (0)
#endif /* CONFIG_SPARSEMEM */
+#ifdef CONFIG_NODES_SPAN_OTHER_NODES
+#define early_pfn_in_nid(pfn, nid) (early_pfn_to_nid(pfn) == (nid))
+#else
+#define early_pfn_in_nid(pfn, nid) (1)
+#endif
+
#ifndef early_pfn_valid
#define early_pfn_valid(pfn) (1)
#endif
--- linux-2.6.18.1.orig/mm/page_alloc.c
+++ linux-2.6.18.1/mm/page_alloc.c
@@ -1673,6 +1673,8 @@ void __meminit memmap_init_zone(unsigned
for (pfn = start_pfn; pfn < end_pfn; pfn++) {
if (!early_pfn_valid(pfn))
continue;
+ if (!early_pfn_in_nid(pfn, nid))
+ continue;
page = pfn_to_page(pfn);
set_page_links(page, zone, nid, pfn);
init_page_count(page);
--