linux-kernel - [PATCH tip:x86/memblock RFC] sparc: Use HAVE_MEMBLOCK_NODE

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Date:	Sun, 24 Jul 2011 12:50:18 +0200
From:	Tejun Heo <tj@...nel.org>
To:	"David S. Miller" <davem@...emloft.net>
Cc:	sparclinux@...r.kernel.org, linux-kernel@...r.kernel.org,
	"H. Peter Anvin" <hpa@...or.com>
Subject: [PATCH tip:x86/memblock RFC] sparc: Use HAVE_MEMBLOCK_NODE_MAP

sparc doesn't access early_node_map[] directly and enabling
HAVE_MEMBLOCK_NODE_MAP is trivial - replacing add_active_range() calls
with memblock_set_node() and selecting HAVE_MEMBLOCK_NODE_MAP is
enough.

Signed-off-by: Tejun Heo <tj@...nel.org>
Cc: "David S. Miller" <davem@...emloft.net>
Cc: sparclinux@...r.kernel.org
---
David, memblock now can carry node information itself without relying
on early_node_map[], which makes operations which make use of both
information much saner and generally makes NUMA memory init simpler.

Boot-tested 64bit [!]SMP [!]NUMA on my non-NUMA u60.  Compile tested
32bit [!]SMP.

The patches implementing HAVE_MEMBLOCK_NODE_MAP is currently in
tip:x86/memblock branch on which this patch is based on.

Thanks.

 arch/sparc/Kconfig      |    3 +++
 arch/sparc/mm/init_64.c |   24 ++++--------------------
 2 files changed, 7 insertions(+), 20 deletions(-)

Index: work/arch/sparc/Kconfig
===================================================================
--- work.orig/arch/sparc/Kconfig
+++ work/arch/sparc/Kconfig
@@ -356,6 +356,9 @@ config NODES_SPAN_OTHER_NODES
 config ARCH_POPULATES_NODE_MAP
 	def_bool y if SPARC64
 
+config HAVE_MEMBLOCK_NODE_MAP
+	def_bool y if SPARC64
+
 config ARCH_SELECT_MEMORY_MODEL
 	def_bool y if SPARC64
 
Index: work/arch/sparc/mm/init_64.c
===================================================================
--- work.orig/arch/sparc/mm/init_64.c
+++ work/arch/sparc/mm/init_64.c
@@ -811,7 +811,7 @@ static u64 memblock_nid_range(u64 start,
 #endif
 
 /* This must be invoked after performing all of the necessary
- * add_active_range() calls for 'nid'.  We need to be able to get
+ * memblock_set_node() calls for 'nid'.  We need to be able to get
  * correct data from get_pfn_range_for_nid().
  */
 static void __init allocate_node_data(int nid)
@@ -982,14 +982,11 @@ static void __init add_node_ranges(void)
 
 			this_end = memblock_nid_range(start, end, &nid);
 
-			numadbg("Adding active range nid[%d] "
+			numadbg("Setting memblock NUMA node nid[%d] "
 				"start[%lx] end[%lx]\n",
 				nid, start, this_end);
 
-			add_active_range(nid,
-					 start >> PAGE_SHIFT,
-					 this_end >> PAGE_SHIFT);
-
+			memblock_set_node(start, this_end - start, nid);
 			start = this_end;
 		}
 	}
@@ -1277,7 +1274,6 @@ static void __init bootmem_init_nonnuma(
 {
 	unsigned long top_of_ram = memblock_end_of_DRAM();
 	unsigned long total_ram = memblock_phys_mem_size();
-	struct memblock_region *reg;
 
 	numadbg("bootmem_init_nonnuma()\n");
 
@@ -1287,20 +1283,8 @@ static void __init bootmem_init_nonnuma(
 	       (top_of_ram - total_ram) >> 20);
 
 	init_node_masks_nonnuma();
-
-	for_each_memblock(memory, reg) {
-		unsigned long start_pfn, end_pfn;
-
-		if (!reg->size)
-			continue;
-
-		start_pfn = memblock_region_memory_base_pfn(reg);
-		end_pfn = memblock_region_memory_end_pfn(reg);
-		add_active_range(0, start_pfn, end_pfn);
-	}
-
+	memblock_set_node(0, (phys_addr_t)ULLONG_MAX, 0);
 	allocate_node_data(0);
-
 	node_set_online(0);
 }
 
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